3-[chloro-[di(propan-2-yl)amino]phosphanyl]oxypropanenitrile

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Compound 31 (3.0 grams, 4.43 mmol) was dissolved in anhydrous dichloromethane and diisopropylethylamine (2.7 mL; 15.5 mmol) was added. The solution was cooled to 0° C. and 2-cyanoethyl-N,N-diisopropylchlorophosphoramidite (2.0 mL, 8.86 mmol) was added. The reaction mixture was allowed to warm to room temperature with stirring under argon. After 4 hours the solution was diluted with dichloromethane and washed with a 5% aqueous solution of sodium bicarbonate (2×). The organic phase was dried (MgSO4), concentrated in vacuo, and purified by column chromatography (silica gel; EtOAc/hexane, 3/7) to afford 2.8 grams (72%) of compound 32 as a fluffy white solid. 1H NMR (300 MHz, CDCl3) δ1.01-1.20 (m, 12H), 1.41 (s, 3H), 2.25-2.67 (m, 8H), 3.26-4.22 (m, 11H), 4.60-4.65 (m, 1H), 5.02 (dd, J=1.5, 10.4 Hz, 2H), 5.14 (dd, J=1.5, 17.3 Hz, 2H), 5.69-5.84 (m, 2H), 6.11-6.48 (m, 5H), 6.82 (dd, J=3.2, 8.9 Hz, 4H), 7.16-7.43 (m, 9H), 7.62 (d, J=15.2 Hz, 1H), 8.05 (bs, 1H); 31P NMR (300 MHz, DMSO-d6) 152.9, 152.4; Anal. Calcd for C50H61N4O8P1 (877.0276): C, 68.48; H, 7.01; N, 6.39. Found: C, 68.48; H, 7.22; N, 6.33. ##STR18## to warm to room temperature washed with a 5% aqueous solution of sodium bicarbonate (2×) The organic phase was dried (MgSO4) concentrated in vacuo purified by column chromatography (silica gel; EtOAc/hexane, 3/7)

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

Procedure: Under the protection of N2, 2-cyanoethyl-N,N-diisopropylchlorophosphoramidite (0.69 mL, 3.10 mmol) was added drop-wise to a 0° C. anhydrous tetrahydrofuran (12 mL) solution of 9-{5-O-[bis(4-methoxyphenyl)(phenyl)methyl]-2-O-benzyl-β-D-arabinofuranosyl}-6-[2-(trimethylsilyl)ethoxy]-9H-purine (1.18 g g, 1.55 mmol), N,N-diisopropylethylamine (0.81 mL, 4.65 mmol)), and 1-methylimidazole (0.06 mL, 0.78 mmol). The reaction was gradually warmed to room temperature and stirred for 60 min. The reaction was then quenched with methanol (5 mL) and stirred for 5 min. After the solvent was removed under the reduced pressure, the residue was purified by flash chromatography (gradient: hexane with EtOAc 0-50%, with 1% triethylamine in both hexane and EtOAc) to produce 1.41 g (94.6%, 1.47 mmol) final product. LCMS: for C52H65N6O5PSi calculated 961.167. found 961.6 [M+H]+. 31P NMR (600 MHz, CD3CN) δ: 150.65, 150.24. The reaction was then quenched with methanol (5 mL) stirred for 5 min After the solvent was removed under the reduced pressure the residue was purified by flash chromatography (gradient

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

Procedure: Under the protection of N2, 2-cyanoethyl-N,N-diisopropylchlorophosphoramidite (1.21 mL, 5.45 mmol) was added drop-wise to a 0° C. anhydrous tetrahydrofuran (12 mL) solution of 2′-O-benzyl-5′-O-[bis(4-methoxyphenyl)(phenyl)methyl]inosine (1.80 g, 2.72 mmol), N,N-diisopropylethylamine (1.42 mL, 8.17 mmol)), and 1-methylimidazole (0.11 mL, 1.36 mmol). The reaction was gradually warmed to room temperature and stirred for 60 min. The reaction was then quenched with methanol (5 mL) and stirred for 5 min. After the solvent was removed under the reduced pressure, the residue was purified by flash chromatography (gradient: methylene chloride with methanol 0-4%, with 1% triethylamine in both methylene chloride and methanol) to produce 1.83 g (78%, 2.13 mmol) final product. LCMS: for C47H53N6O8P calculated 860.4. found 861.3 [M+H]+ and 884.4 [M+Na]+. 31P NMR (600 MHz, CD3CN) δ: 150.82, 150.55. The reaction was then quenched with methanol (5 mL) stirred for 5 min After the solvent was removed under the reduced pressure the residue was purified by flash chromatography (gradient

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

Procedure: To a cooled solution (0° C.) of 1,4-anhydro-2-O-benzyl-5-O-[bis(4-methoxyphenyl)(phenyl)methyl]D-ribitol (1.60 g, 3.04 mmol) and N,N-diisopropylethylamine (1.59 mL, 9.11 mmol) in DCM (20 mL), 2-cyanoethyl-N,N-diisopropylchlorophosphoramidite (1.44 g, 6.08 mmol) and 1-methylimidazole (0.12 mL, 1.519 mmol) were added. The reaction mixture was warmed to ambient temperature and stirred for 90 min. The reaction was then quenched with methanol (5 mL) and stirred for 5 min. The solvent was then removed in vacuo, and the residue was purified by flash chromatography using 20% ethyl acetate in hexane to obtain 0.94 g (1.293 mmol, 42.6%) of the pure product. LCMS: for C42H51N2O7P calculated 726.3. found 727.3 [M+H]+ and 749.4 [M+Na]+. 31P NMR (400 MHz, CD3CN) δ: 149.94, 149.70. The reaction was then quenched with methanol (5 mL) stirred for 5 min The solvent was then removed in vacuo the residue was purified by flash chromatography

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

Procedure: To a solution of 1.9 mL (13.8 mmol) of dichloro(β-cyano)ethoxyphosphine in 40 mL of dichloromethane cooled in an ice-water bath was added 10 mL of diisopropylethylamine, followed by adding 2.3 mL (13.8 mmol) of diisopropylamine under Argon. The reaction mixture was warmed up to room temperature and stirred for 2 h. After adding 0.1 gm of DMAP into the solution, the reaction mixture is ready for next step reaction. the reaction mixture is ready for next step reaction