N-hexylacetamide

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of N-hexyl acetamide (15.0 g, 105 mmol) in 15 mL of dry toluene was slowly added 11.2 g (104.9 mmol) of dimethylcarbamyl chloride. The solution was refluxed under a nitrogen atmosphere for 24 h. The volatile materials were removed on a rotary evaporator and then in vacuo at room temperature. The residue was dissolved 30 mL of chloroform and stirred vigorously with a solution of 4.2 g sodium hydroxide in 40 mL of water for 30 min. Calcium carbonate (4.2 g) was added and stirring was continued for another 30 min. The organic phase was separated and the aqueous phase was extracted with dichloromethane (25 mL×3). The combined organic phases were dried (calcium carbonate) and the solvent was removed on a rotary evaporator. The residue was distilled at 52-54° C./0.25 Torr (lit. bp 125° C./30 Torr (see Oszczapowicz, J.; Raczynska, E. J. Chem. Soc., Perkin Trans. 2 1984, 1643-1666)) product to yield 8.7 g (49%) of liquid (purity 99% by GC). IR (neat) 2955, 2926, 2856 (C—H), 1626 (N═C) cm−1. 1H NMR 3.18 (t, 2H, JHH 7.5 Hz, —CH2—N═), 2.87 (s, 6H, —N—(CH3)2); 1.87 (s, 3H, —N═C(CH3)—N); 1.49 (m, 2H, —CH2—CH2—N═); 1.25-1.4 (m, 6H, CH3—(CH2)3—); 0.88 (t, 3H, JHH 7.2 Hz, CH3). 13C NMR 158.79; 50.32; 38.07; 32.49; 32.00; 27.38; 22.80; 14.17; 12.45. The solution was refluxed under a nitrogen atmosphere for 24 h The volatile materials were removed on a rotary evaporator at room temperature The residue was dissolved 30 mL of chloroform Calcium carbonate (4.2 g) was added stirring was continued for another 30 min The organic phase was separated the aqueous phase was extracted with dichloromethane (25 mL×3) The combined organic phases were dried (calcium carbonate) the solvent was removed on a rotary evaporator The residue was distilled at 52-54° C./0.25 Torr (lit. bp 125° C./30 Torr (see Oszczapowicz, J.; Raczynska, E. J. Chem. Soc., Perkin Trans. 2 1984, 1643-1666)) product

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: N-Hexyl acetamide (10.0 g, 77.5 mmol) was added 10 mL of dry toluene, then 8.33 g (77.5 mmol) of dimethylcarbamyl chloride was slowly added and then refluxed under a nitrogen atmosphere for 16 h. The volatile materials were removed on a rotary evaporator and then in vacuo at room temperature. The residue was dissolved dichloromethane (30 mL) and 3.1 g (77.5 mmol) of sodium hydroxide dissolved aqueous solution (40 mL) was added. The mixture was stirred vigorously for 30 min. Calcium carbonate (3.1 g) was added to the mixture and it was stirred another 30 min. The organic phase was separated and the aqueous phase was washed with dichloromethane (3×25 mL). The combined organic liquids were dried (calcium carbonate) and the volatile materials were removed on a rotary evaporator. The residue was distilled at 40-41° C./0.25 Torr to yield 4.7 g (39%) of product (98.5% pure by GC). IR (neat) 2956, 2927, 2857 (C—H), 1626 (N═C) cm−1. 1H NMR 3.18 (t, 2H, JHH 7.5 Hz, —CH2—N═), 2.87 (s, 6H, —N—(CH3)2); 1.88 (s, 3H, —N═C(CH3)—N); 1.51 (m, 2H, —CH2—CH2—N═); 1.25-1.4 (m, 4H, CH3—(CH2)2—); 0.90 (t, 3H, JHH 6.9 Hz, CH3). 13C NMR 158.90; 50.35; 38.15; 32.27; 29.98; 22.87; 14.31; 12.53. refluxed under a nitrogen atmosphere for 16 h The volatile materials were removed on a rotary evaporator at room temperature was added was stirred another 30 min The organic phase was separated the aqueous phase was washed with dichloromethane (3×25 mL) The combined organic liquids were dried (calcium carbonate) the volatile materials were removed on a rotary evaporator The residue was distilled at 40-41° C./0.25 Torr

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Dimethylcarbamyl chloride (9.35 g, 86.9 mmol) was slowly added to a solution of N-hexyl acetamide (10.0 g, 86.9 mmol) in 10 mL of dry toluene. After being refluxed under a nitrogen atmosphere for 16 h, the volatile materials were removed on a rotary evaporator and then in vacuo for 2 h at room temperature. The residue was dissolved in 30 mL dichloromethane and the solution was stirred vigorously with a solution of 3.48 g (86.9 mmol) of sodium hydroxide in 40 mL water for 30 min. Calcium carbonate (3.48 g) was added to the mixture and it was stirred another 30 min. The organic phase was separated and the aqueous phase was washed with dichloromethane (3×25 mL). The combined organic phases were dried over anhydrous calcium carbonate. The volatile materials were evaporated on a rotary evaporator. The residue was distilled, bp 28-30° C./0.25 Torr (lit. bp 69-71° C./13 Torr (see Haug, E. et al. Synthesis, 1983, 35-37)), to yield 4.0 g (32%) of product, 98% pure (GC). IR (neat) 2956, 2929, 286 (C—H), 1629 (N═C) cm−1. 1H NMR 3.17 (t, 2H, JHH 7.2 Hz, —CH2—N═), 2.86 (s, 6H, —N—(CH3)2); 1.87 (s, 3H, —N═C(CH3)—N); 1.5 (m, 2H, —CH2—CH2—N═); 1.25- 1.4 (m, 6H, CH3—(CH2)3—); 0.88 (t, 3H, JHH 7.2 Hz, CH3). After being refluxed under a nitrogen atmosphere for 16 h the volatile materials were removed on a rotary evaporator The residue was dissolved in 30 mL dichloromethane The organic phase was separated the aqueous phase was washed with dichloromethane (3×25 mL) The combined organic phases were dried over anhydrous calcium carbonate The volatile materials were evaporated on a rotary evaporator The residue was distilled bp 28-30° C./0.25 Torr (lit. bp 69-71° C./13 Torr (see Haug, E. et al. Synthesis, 1983, 35-37))

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of N-hexyl acetamide (15.0 g, 105 mmol) in 15 mL of dry toluene was slowly added 11.2 g (104.9 mmol) of dimethylcarbamyl chloride. The solution was refluxed under a nitrogen atmosphere for 24 h. The volatile materials were removed on a rotary evaporator and then in vacuo at room temperature. The residue was dissolved 30 mL of chloroform and stirred vigorously with a solution of 4.2 g sodium hydroxide in 40 mL of water for 30 min. Calcium carbonate (4.2 g) was added and stirring was continued for another 30 min. The organic phase was separated and the aqueous phase was extracted with dichloromethane (25 mL×3). The combined organic phases were dried (calcium carbonate) and the solvent was removed on a rotary evaporator. The residue was distilled at 52-54° C./0.25 Torr (lit. bp 125° C./30 Torr (see Oszczapowicz, J.; Raczynska, E. J. Chem. Soc., Perkin Trans. 2 1984, 1643-1666)) product to yield 8.7 g (49%) of liquid (purity 99% by GC). IR (neat) 2955, 2926, 2856 (C—H), 1626 (N═C) cm−1. 1H NMR 3.18 (t, 2H, JHH 7.5 Hz, —CH2—N═), 2.87 (s, 6H, —N—(CH3)2); 1.87 (s, 3H, —N═C(CH3)—N); 1.49 (m, 2H, —CH2—CH2—N═); 1.25-1.4 (m, 6H, CH3—(CH2)3—); 0.88 (t, 3H, JHH 7.2 Hz, CH3). 13C NMR 158.79; 50.32; 38.07; 32.49; 32.00; 27.38; 22.80; 14.17; 12.45. The solution was refluxed under a nitrogen atmosphere for 24 h The volatile materials were removed on a rotary evaporator at room temperature The residue was dissolved 30 mL of chloroform Calcium carbonate (4.2 g) was added stirring was continued for another 30 min The organic phase was separated the aqueous phase was extracted with dichloromethane (25 mL×3) The combined organic phases were dried (calcium carbonate) the solvent was removed on a rotary evaporator The residue was distilled at 52-54° C./0.25 Torr (lit. bp 125° C./30 Torr (see Oszczapowicz, J.; Raczynska, E. J. Chem. Soc., Perkin Trans. 2 1984, 1643-1666)) product

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: N-Hexyl acetamide (10.0 g, 77.5 mmol) was added 10 mL of dry toluene, then 8.33 g (77.5 mmol) of dimethylcarbamyl chloride was slowly added and then refluxed under a nitrogen atmosphere for 16 h. The volatile materials were removed on a rotary evaporator and then in vacuo at room temperature. The residue was dissolved dichloromethane (30 mL) and 3.1 g (77.5 mmol) of sodium hydroxide dissolved aqueous solution (40 mL) was added. The mixture was stirred vigorously for 30 min. Calcium carbonate (3.1 g) was added to the mixture and it was stirred another 30 min. The organic phase was separated and the aqueous phase was washed with dichloromethane (3×25 mL). The combined organic liquids were dried (calcium carbonate) and the volatile materials were removed on a rotary evaporator. The residue was distilled at 40-41° C./0.25 Torr to yield 4.7 g (39%) of product (98.5% pure by GC). IR (neat) 2956, 2927, 2857 (C—H), 1626 (N═C) cm−1. 1H NMR 3.18 (t, 2H, JHH 7.5 Hz, —CH2—N═), 2.87 (s, 6H, —N—(CH3)2); 1.88 (s, 3H, —N═C(CH3)—N); 1.51 (m, 2H, —CH2—CH2—N═); 1.25-1.4 (m, 4H, CH3—(CH2)2—); 0.90 (t, 3H, JHH 6.9 Hz, CH3). 13C NMR 158.90; 50.35; 38.15; 32.27; 29.98; 22.87; 14.31; 12.53. refluxed under a nitrogen atmosphere for 16 h The volatile materials were removed on a rotary evaporator at room temperature was added was stirred another 30 min The organic phase was separated the aqueous phase was washed with dichloromethane (3×25 mL) The combined organic liquids were dried (calcium carbonate) the volatile materials were removed on a rotary evaporator The residue was distilled at 40-41° C./0.25 Torr

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Dimethylcarbamyl chloride (9.35 g, 86.9 mmol) was slowly added to a solution of N-hexyl acetamide (10.0 g, 86.9 mmol) in 10 mL of dry toluene. After being refluxed under a nitrogen atmosphere for 16 h, the volatile materials were removed on a rotary evaporator and then in vacuo for 2 h at room temperature. The residue was dissolved in 30 mL dichloromethane and the solution was stirred vigorously with a solution of 3.48 g (86.9 mmol) of sodium hydroxide in 40 mL water for 30 min. Calcium carbonate (3.48 g) was added to the mixture and it was stirred another 30 min. The organic phase was separated and the aqueous phase was washed with dichloromethane (3×25 mL). The combined organic phases were dried over anhydrous calcium carbonate. The volatile materials were evaporated on a rotary evaporator. The residue was distilled, bp 28-30° C./0.25 Torr (lit. bp 69-71° C./13 Torr (see Haug, E. et al. Synthesis, 1983, 35-37)), to yield 4.0 g (32%) of product, 98% pure (GC). IR (neat) 2956, 2929, 286 (C—H), 1629 (N═C) cm−1. 1H NMR 3.17 (t, 2H, JHH 7.2 Hz, —CH2—N═), 2.86 (s, 6H, —N—(CH3)2); 1.87 (s, 3H, —N═C(CH3)—N); 1.5 (m, 2H, —CH2—CH2—N═); 1.25- 1.4 (m, 6H, CH3—(CH2)3—); 0.88 (t, 3H, JHH 7.2 Hz, CH3). After being refluxed under a nitrogen atmosphere for 16 h the volatile materials were removed on a rotary evaporator The residue was dissolved in 30 mL dichloromethane The organic phase was separated the aqueous phase was washed with dichloromethane (3×25 mL) The combined organic phases were dried over anhydrous calcium carbonate The volatile materials were evaporated on a rotary evaporator The residue was distilled bp 28-30° C./0.25 Torr (lit. bp 69-71° C./13 Torr (see Haug, E. et al. Synthesis, 1983, 35-37))

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of N-hexyl acetamide (15.0 g, 105 mmol) in 15 mL of dry toluene was slowly added 11.2 g (104.9 mmol) of dimethylcarbamyl chloride. The solution was refluxed under a nitrogen atmosphere for 24 h. The volatile materials were removed on a rotary evaporator and then in vacuo at room temperature. The residue was dissolved 30 mL of chloroform and stirred vigorously with a solution of 4.2 g sodium hydroxide in 40 mL of water for 30 min. Calcium carbonate (4.2 g) was added and stirring was continued for another 30 min. The organic phase was separated and the aqueous phase was extracted with dichloromethane (25 mL×3). The combined organic phases were dried (calcium carbonate) and the solvent was removed on a rotary evaporator. The residue was distilled at 52-54° C./0.25 Torr (lit. bp 125° C./30 Torr (see Oszczapowicz, J.; Raczynska, E. J. Chem. Soc., Perkin Trans. 2 1984, 1643-1666)) product to yield 8.7 g (49%) of liquid (purity 99% by GC). IR (neat) 2955, 2926, 2856 (C—H), 1626 (N═C) cm−1. 1H NMR 3.18 (t, 2H, JHH 7.5 Hz, —CH2—N═), 2.87 (s, 6H, —N—(CH3)2); 1.87 (s, 3H, —N═C(CH3)—N); 1.49 (m, 2H, —CH2—CH2—N═); 1.25-1.4 (m, 6H, CH3—(CH2)3—); 0.88 (t, 3H, JHH 7.2 Hz, CH3). 13C NMR 158.79; 50.32; 38.07; 32.49; 32.00; 27.38; 22.80; 14.17; 12.45. The solution was refluxed under a nitrogen atmosphere for 24 h The volatile materials were removed on a rotary evaporator at room temperature The residue was dissolved 30 mL of chloroform Calcium carbonate (4.2 g) was added stirring was continued for another 30 min The organic phase was separated the aqueous phase was extracted with dichloromethane (25 mL×3) The combined organic phases were dried (calcium carbonate) the solvent was removed on a rotary evaporator The residue was distilled at 52-54° C./0.25 Torr (lit. bp 125° C./30 Torr (see Oszczapowicz, J.; Raczynska, E. J. Chem. Soc., Perkin Trans. 2 1984, 1643-1666)) product

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: N-Hexyl acetamide (10.0 g, 77.5 mmol) was added 10 mL of dry toluene, then 8.33 g (77.5 mmol) of dimethylcarbamyl chloride was slowly added and then refluxed under a nitrogen atmosphere for 16 h. The volatile materials were removed on a rotary evaporator and then in vacuo at room temperature. The residue was dissolved dichloromethane (30 mL) and 3.1 g (77.5 mmol) of sodium hydroxide dissolved aqueous solution (40 mL) was added. The mixture was stirred vigorously for 30 min. Calcium carbonate (3.1 g) was added to the mixture and it was stirred another 30 min. The organic phase was separated and the aqueous phase was washed with dichloromethane (3×25 mL). The combined organic liquids were dried (calcium carbonate) and the volatile materials were removed on a rotary evaporator. The residue was distilled at 40-41° C./0.25 Torr to yield 4.7 g (39%) of product (98.5% pure by GC). IR (neat) 2956, 2927, 2857 (C—H), 1626 (N═C) cm−1. 1H NMR 3.18 (t, 2H, JHH 7.5 Hz, —CH2—N═), 2.87 (s, 6H, —N—(CH3)2); 1.88 (s, 3H, —N═C(CH3)—N); 1.51 (m, 2H, —CH2—CH2—N═); 1.25-1.4 (m, 4H, CH3—(CH2)2—); 0.90 (t, 3H, JHH 6.9 Hz, CH3). 13C NMR 158.90; 50.35; 38.15; 32.27; 29.98; 22.87; 14.31; 12.53. refluxed under a nitrogen atmosphere for 16 h The volatile materials were removed on a rotary evaporator at room temperature was added was stirred another 30 min The organic phase was separated the aqueous phase was washed with dichloromethane (3×25 mL) The combined organic liquids were dried (calcium carbonate) the volatile materials were removed on a rotary evaporator The residue was distilled at 40-41° C./0.25 Torr

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Dimethylcarbamyl chloride (9.35 g, 86.9 mmol) was slowly added to a solution of N-hexyl acetamide (10.0 g, 86.9 mmol) in 10 mL of dry toluene. After being refluxed under a nitrogen atmosphere for 16 h, the volatile materials were removed on a rotary evaporator and then in vacuo for 2 h at room temperature. The residue was dissolved in 30 mL dichloromethane and the solution was stirred vigorously with a solution of 3.48 g (86.9 mmol) of sodium hydroxide in 40 mL water for 30 min. Calcium carbonate (3.48 g) was added to the mixture and it was stirred another 30 min. The organic phase was separated and the aqueous phase was washed with dichloromethane (3×25 mL). The combined organic phases were dried over anhydrous calcium carbonate. The volatile materials were evaporated on a rotary evaporator. The residue was distilled, bp 28-30° C./0.25 Torr (lit. bp 69-71° C./13 Torr (see Haug, E. et al. Synthesis, 1983, 35-37)), to yield 4.0 g (32%) of product, 98% pure (GC). IR (neat) 2956, 2929, 286 (C—H), 1629 (N═C) cm−1. 1H NMR 3.17 (t, 2H, JHH 7.2 Hz, —CH2—N═), 2.86 (s, 6H, —N—(CH3)2); 1.87 (s, 3H, —N═C(CH3)—N); 1.5 (m, 2H, —CH2—CH2—N═); 1.25- 1.4 (m, 6H, CH3—(CH2)3—); 0.88 (t, 3H, JHH 7.2 Hz, CH3). After being refluxed under a nitrogen atmosphere for 16 h the volatile materials were removed on a rotary evaporator The residue was dissolved in 30 mL dichloromethane The organic phase was separated the aqueous phase was washed with dichloromethane (3×25 mL) The combined organic phases were dried over anhydrous calcium carbonate The volatile materials were evaporated on a rotary evaporator The residue was distilled bp 28-30° C./0.25 Torr (lit. bp 69-71° C./13 Torr (see Haug, E. et al. Synthesis, 1983, 35-37))

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of N-hexyl acetamide (15.0 g, 105 mmol) in 15 mL of dry toluene was slowly added 11.2 g (104.9 mmol) of dimethylcarbamyl chloride. The solution was refluxed under a nitrogen atmosphere for 24 h. The volatile materials were removed on a rotary evaporator and then in vacuo at room temperature. The residue was dissolved 30 mL of chloroform and stirred vigorously with a solution of 4.2 g sodium hydroxide in 40 mL of water for 30 min. Calcium carbonate (4.2 g) was added and stirring was continued for another 30 min. The organic phase was separated and the aqueous phase was extracted with dichloromethane (25 mL×3). The combined organic phases were dried (calcium carbonate) and the solvent was removed on a rotary evaporator. The residue was distilled at 52-54° C./0.25 Torr (lit. bp 125° C./30 Torr (see Oszczapowicz, J.; Raczynska, E. J. Chem. Soc., Perkin Trans. 2 1984, 1643-1666)) product to yield 8.7 g (49%) of liquid (purity 99% by GC). IR (neat) 2955, 2926, 2856 (C—H), 1626 (N═C) cm−1. 1H NMR 3.18 (t, 2H, JHH 7.5 Hz, —CH2—N═), 2.87 (s, 6H, —N—(CH3)2); 1.87 (s, 3H, —N═C(CH3)—N); 1.49 (m, 2H, —CH2—CH2—N═); 1.25-1.4 (m, 6H, CH3—(CH2)3—); 0.88 (t, 3H, JHH 7.2 Hz, CH3). 13C NMR 158.79; 50.32; 38.07; 32.49; 32.00; 27.38; 22.80; 14.17; 12.45. The solution was refluxed under a nitrogen atmosphere for 24 h The volatile materials were removed on a rotary evaporator at room temperature The residue was dissolved 30 mL of chloroform Calcium carbonate (4.2 g) was added stirring was continued for another 30 min The organic phase was separated the aqueous phase was extracted with dichloromethane (25 mL×3) The combined organic phases were dried (calcium carbonate) the solvent was removed on a rotary evaporator The residue was distilled at 52-54° C./0.25 Torr (lit. bp 125° C./30 Torr (see Oszczapowicz, J.; Raczynska, E. J. Chem. Soc., Perkin Trans. 2 1984, 1643-1666)) product

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: N-Hexyl acetamide (10.0 g, 77.5 mmol) was added 10 mL of dry toluene, then 8.33 g (77.5 mmol) of dimethylcarbamyl chloride was slowly added and then refluxed under a nitrogen atmosphere for 16 h. The volatile materials were removed on a rotary evaporator and then in vacuo at room temperature. The residue was dissolved dichloromethane (30 mL) and 3.1 g (77.5 mmol) of sodium hydroxide dissolved aqueous solution (40 mL) was added. The mixture was stirred vigorously for 30 min. Calcium carbonate (3.1 g) was added to the mixture and it was stirred another 30 min. The organic phase was separated and the aqueous phase was washed with dichloromethane (3×25 mL). The combined organic liquids were dried (calcium carbonate) and the volatile materials were removed on a rotary evaporator. The residue was distilled at 40-41° C./0.25 Torr to yield 4.7 g (39%) of product (98.5% pure by GC). IR (neat) 2956, 2927, 2857 (C—H), 1626 (N═C) cm−1. 1H NMR 3.18 (t, 2H, JHH 7.5 Hz, —CH2—N═), 2.87 (s, 6H, —N—(CH3)2); 1.88 (s, 3H, —N═C(CH3)—N); 1.51 (m, 2H, —CH—CH2—N═); 1.25-1.4 (m, 4H, CH3—(CH2)2—); 0.90 (t, 3H, JHH 6.9 Hz, CH3). 13C NMR 158.90; 50.35; 38.15; 32.27; 29.98; 22.87; 14.31; 12.53. refluxed under a nitrogen atmosphere for 16 h The volatile materials were removed on a rotary evaporator at room temperature was added was stirred another 30 min The organic phase was separated the aqueous phase was washed with dichloromethane (3×25 mL) The combined organic liquids were dried (calcium carbonate) the volatile materials were removed on a rotary evaporator The residue was distilled at 40-41° C./0.25 Torr

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Dimethylcarbamyl chloride (9.35 g, 86.9 mmol) was slowly added to a solution of N-hexyl acetamide (10.0 g, 86.9 mmol) in 10 mL of dry toluene. After being refluxed under a nitrogen atmosphere for 16 h, the volatile materials were removed on a rotary evaporator and then in vacuo for 2 h at room temperature. The residue was dissolved in 30 mL dichloromethane and the solution was stirred vigorously with a solution of 3.48 g (86.9 mmol) of sodium hydroxide in 40 mL water for 30 min. Calcium carbonate (3.48 g) was added to the mixture and it was stirred another 30 min. The organic phase was separated and the aqueous phase was washed with dichloromethane (3×25 mL). The combined organic phases were dried over anhydrous calcium carbonate. The volatile materials were evaporated on a rotary evaporator. The residue was distilled, by 28-30° C./0.25 Torr (lit. bp 69-71° C./13 Torr (see Haug, E. et al. Synthesis, 1983, 35-37)), to yield 4.0 g (32%) of product, 98% pure (GC). IR (neat) 2956, 2929, 286 (C—H), 1629 (N═C) cm−1. 1H NMR 3.17 (t, 2H, JHH 7.2 Hz, —CH2—N═), 2.86 (s, 6H, —N—(CH3)2); 1.87 (s, 3H, —N═C(CH3)—N); 1.5 (m, 2H, —CH—CH2—N═); 1.25-1.4 (m, 6H, CH3—(CH)3—); 0.88 (t, 3H, JHH 7.2 Hz, CH3). After being refluxed under a nitrogen atmosphere for 16 h the volatile materials were removed on a rotary evaporator The residue was dissolved in 30 mL dichloromethane The organic phase was separated the aqueous phase was washed with dichloromethane (3×25 mL) The combined organic phases were dried over anhydrous calcium carbonate The volatile materials were evaporated on a rotary evaporator The residue was distilled, by 28-30° C./ 0.25 Torr (lit. bp 69-71° C./13 Torr (see Haug, E. et al. Synthesis, 1983, 35-37))