3-(chloromethyl)-3-methyloxetane

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

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

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

Procedure: A mixture of 3-chloromethyl-3-methyloxetane (10.1 g, 83.5 mmol), tetra-n-butylammonium bromide (0.308 g, 0.96 mmol), sodium azide (6.5 g, 100 mmol) and water (27 mL) was heated at about 96° C. to about 103° C. for 4.5 h, after which time gas chromatographic analysis of the mixture indicated that the reaction had reached completion. The mixture was cooled to ambient temperature, and extracted with methylene chloride (25 mL). The organic extract was passed through a column containing aluminum oxide (10 g), and the column was rinsed with additional methylene chloride. The solvent was evaporated to give 9.84 g (93% yield) of 3-azidomethyl-3methyloxetane (>99.5% purity by glc and NMR analysis). NMR: 1H NMR: δ1.32 (s, 3H), 3.52 (s, 2H), 4.25 & 4.35 (AB, J=6.0 Hz, 4H); 13C NMR: δ21.44, 58.33, 40.03, 79.76; glc Rt= 3.19 min. was heated at about 96° C. to about 103° C. for 4.5 h extracted with methylene chloride (25 mL) The organic extract containing aluminum oxide (10 g) the column was rinsed with additional methylene chloride The solvent was evaporated

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

Procedure: A mixture of 3-chloromethyl-3-methyloxetane (10.1 g, 83.5 mmol), tetra-n-butylammonium bromide (0.308 g, 0.96 mmol), sodium azide (6.5 g, 100 mmol) and water (27 mL) was heated at about 96° C. to about 103° C. for 4.5 h, after which time gas chromatographic analysis of the mixture indicated that the reaction had reached completion. The mixture was cooled to ambient temperature, and extracted with methylene chloride (25 mL). The organic extract was passed through a column containing aluminum oxide (10 g), and the column was rinsed with additional methylene chloride. The solvent was evaporated to give 9.84 g (93% yield) of 3-azidomethyl-3methyloxetane (>99.5% purity by glc and NMR analysis). NMR: 1H NMR: δ1.32 (s, 3H), 3.52 (s, 2H), 4.25 & 4.35 (AB, J=6.0 Hz, 4H); 13C NMR: δ21.44, 58.33, 40.03, 79.76; glc Rt= 3.19 min. was heated at about 96° C. to about 103° C. for 4.5 h extracted with methylene chloride (25 mL) The organic extract containing aluminum oxide (10 g) the column was rinsed with additional methylene chloride The solvent was evaporated

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

Procedure: As such, it has been discovered that monofunctional azidooxetane compounds, i.e., 3-azidomethyl-3-R1 -oxetanes, can also be prepared by combining a neat halooxetane with an aqueous metallic azide solution and a phase transfer catalyst (PTC). For example, using the process of the present invention, 3-chloromethyl-3-methyloxetane gives the corresponding 3-azidomethyl-3-methyloxetane (AMMO) in 97% yield. Moreover, 3-bromomethyl-3-hydroxymethyloxetane was previously converted to the corresponding 3-azidomethyl-3-hydroxymethyloxetane in acetone. Using the process of the present invention, however, 3-bromomethyl-3-hydroxymethyloxetane is converted to the corresponding 3-azidomethyl-3-hydroxymethyloxetane, without the use of an organic solvent, using an aqueous sodium azide solution and a phase transfer catalyst. The process of the present invention gives the same result with a faster rate of reaction and without the use of an organic solvent. In addition, 3-chloromethyl-3-methyloxetane 3-chloromethyl-3-phenoxymethyloxetane reacts with an aqueous solution of sodium azide in water with a PTC to give 3-azidomethyl-3-phenoxymethyloxetane in 87% yield. can also be prepared

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

Procedure: As such, it has been discovered that monofunctional azidooxetane compounds, i.e., 3-azidomethyl-3-R1 -oxetanes, can also be prepared by combining a neat halooxetane with an aqueous metallic azide solution and a phase transfer catalyst (PTC). For example, using the process of the present invention, 3-chloromethyl-3-methyloxetane gives the corresponding 3-azidomethyl-3-methyloxetane (AMMO) in 97% yield. Moreover, 3-bromomethyl-3-hydroxymethyloxetane was previously converted to the corresponding 3-azidomethyl-3-hydroxymethyloxetane in acetone. Using the process of the present invention, however, 3-bromomethyl-3-hydroxymethyloxetane is converted to the corresponding 3-azidomethyl-3-hydroxymethyloxetane, without the use of an organic solvent, using an aqueous sodium azide solution and a phase transfer catalyst. The process of the present invention gives the same result with a faster rate of reaction and without the use of an organic solvent. In addition, 3-chloromethyl-3-methyloxetane 3-chloromethyl-3-phenoxymethyloxetane reacts with an aqueous solution of sodium azide in water with a PTC to give 3-azidomethyl-3-phenoxymethyloxetane in 87% yield. can also be prepared

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of Example 244A (0.75 g, 2.31 mmol) in N,N-dimethylformamide/tetrahydrofuran (1:4, 20 mL) were added potassium tert-butoxide (0.39 g, 3.46 mmol), tetrabutylammonium iodide (0.09 mg, 0.23 mmol) and commercially available 3-(chloromethyl)-3-methyloxetane (TCI, 0.28 g, 2.31 mmol). The reaction mixture was stirred at 80° C. for 16 hours, cooled, diluted with ethyl acetate (20 mL) and quenched with saturated aqueous NaHCO3 (20 mL). The aqueous layer was extracted with ethyl acetate (2×20 mL). The combined organic layers were washed with water (1×25 mL). The combined organic extracts were dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by column chromatography using an Analogix® Intelliflash280 ™ (SiO2, 0-100% ethyl acetate in hexanes) to afford the title compound. 1H NMR (300 MHz, dimethylsulfoxide-d6) δ ppm 1.24 (s, 3H), 1.33 (s, 9H), 3.77 (s, 3H), 4.19 (d, J=6.1 Hz, 2H), 4.38 (s, 2H), 4.69 (d, J=6.1 Hz, 2H), 7.10 (d, J=9.2 Hz, 1H), 7.29 (s, 1H), 7.44 (dd, J=9.0, 2.9 Hz, 1H), 7.58 (d, J=2.7 Hz, 1H); MS (ESI+) m/z 409 (M+H)+; Anal. Calculated for C20H25ClN2O3S: C, 58.74; H, 6.16; N, 6.85. Found: C, 58.92; H, 6.04; N, 6.84. cooled quenched with saturated aqueous NaHCO3 (20 mL) The aqueous layer was extracted with ethyl acetate (2×20 mL) The combined organic layers were washed with water (1×25 mL) The combined organic extracts were dried over anhydrous Na2SO4 filtered concentrated under reduced pressure The residue was purified by column chromatography

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of Example 244A (0.75 g, 2.31 mmol) in N,N-dimethylformamide/tetrahydrofuran (1:4, 20 mL) were added potassium tert-butoxide (0.39 g, 3.46 mmol), tetrabutylammonium iodide (0.09 mg, 0.23 mmol) and commercially available 3-(chloromethyl)-3-methyloxetane (TCI, 0.28 g, 2.31 mmol). The reaction mixture was stirred at 80° C. for 16 hours, cooled, diluted with ethyl acetate (20 mL) and quenched with saturated aqueous NaHCO3 (20 mL). The aqueous layer was extracted with ethyl acetate (2×20 mL). The combined organic layers were washed with water (1×25 mL). The combined organic extracts were dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by column chromatography using an Analogix® Intelliflash280 ™ (SiO2, 0-100% ethyl acetate in hexanes) to afford the title compound. 1H NMR (300 MHz, dimethylsulfoxide-d6) δ ppm 1.24 (s, 3H), 1.33 (s, 9H), 3.77 (s, 3H), 4.19 (d, J=6.1 Hz, 2H), 4.38 (s, 2H), 4.69 (d, J=6.1 Hz, 2H), 7.10 (d, J=9.2 Hz, 1H), 7.29 (s, 1H), 7.44 (dd, J=9.0, 2.9 Hz, 1H), 7.58 (d, J=2.7 Hz, 1H); MS (ESI+) m/z 409 (M+H)+; Anal. Calculated for C20H25ClN2O3S: C, 58.74; H, 6.16; N, 6.85. Found: C, 58.92; H, 6.04; N, 6.84. cooled quenched with saturated aqueous NaHCO3 (20 mL) The aqueous layer was extracted with ethyl acetate (2×20 mL) The combined organic layers were washed with water (1×25 mL) The combined organic extracts were dried over anhydrous Na2SO4 filtered concentrated under reduced pressure The residue was purified by column chromatography

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

Procedure: A dispersion of 50 weight percent sodium hydride (4.0 g, 83 mmol) in mineral oil was washed with hexanes and suspended in 200 milliliters of dimethylformamide. A solution of 30 grams of 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctan-1-ol (75 mmol) in 50 milliliters of dimethylformamide was added over a period of 3 hours, and the resulting mixture was stirred at room temperature for one hour. Next, a solution of 9.3 grams (77 mmol) of 3-chloromethyl-3-methyloxetane in 20 milliliters of dimethylformamide was added and the resulting mixture was heated at 75° C. for 16 hours. The mixture was cooled to room temperature and slowly poured into 1 liter of ice/water and extracted with two volumes of Freon 113. The combined organic extracts were washed twice with water, once with 2 weight percent aqueous hydrochloric acid and once with brine, dried over magnesium sulfate, filtered, and evaporated to give 32 grams of crude product. The crude product was distilled under reduced pressure to give 26.5 grams (73%) of analytically pure 3-(2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctoxymethy)-3-methyloxetane (i.e., 15-FOX), an oil with a boiling point of 68 to 70° C./1.6 mm-Hg. The experimental analyses were: 1H NMR (CDCl3/Freon 113) δ 4.49 and 4.37 (AB, J=5.5 Hz, 4 H), 4.00 (triplet, J=13.2 Hz, 2 H), 3.70 (singlet, 2 H), and 1.32 (singlet, 3 H); 13C NMR δ 21.02, 40.33, 68.77 (triplet, J=146.2 Hz), 78.60, and 79.87 (signals from carbon bearing fluorine are not included due to complex splitting patterns and low peak intensities); 19F NMR δ −81.3 (3 F), −119.9 (2F), −122.6 (2 F), −123.3 (2 F), −123.5 (2 F), −123.9 (2 F) and −126.8 (2 F). The elemental analysis was: Calculated for C13H11F15O2: C, 32.2; H, 2.3; F, 58.9. Found: C, 32.2; H, 2.2; F, 58.3. the resulting mixture was heated at 75° C. for 16 hours The mixture was cooled to room temperature extracted with two volumes of Freon 113 The combined organic extracts were washed twice with water, once with 2 weight percent aqueous hydrochloric acid and once with brine dried over magnesium sulfate filtered evaporated to give 32 grams of crude product The crude product was distilled under reduced pressure

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

Procedure: A dispersion of 50 weight percent sodium hydride (4.0 g, 83 mmol) in mineral oil was washed with hexanes and suspended in 200 milliliters of dimethylformamide. A solution of 30 grams of 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctan-1-ol (75 mmol) in 50 milliliters of dimethylformamide was added over a period of 3 hours, and the resulting mixture was stirred at room temperature for one hour. Next, a solution of 9.3 grams (77 mmol) of 3-chloromethyl-3-methyloxetane in 20 milliliters of dimethylformamide was added and the resulting mixture was heated at 75° C. for 16 hours. The mixture was cooled to room temperature and slowly poured into 1 liter of ice/water and extracted with two volumes of Freon 113. The combined organic extracts were washed twice with water, once with 2 weight percent aqueous hydrochloric acid and once with brine, dried over magnesium sulfate, filtered, and evaporated to give 32 grams of crude product. The crude product was distilled under reduced pressure to give 26.5 grams (73%) of analytically pure 3-(2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctoxymethy)-3-methyloxetane (i.e., 15-FOX), an oil with a boiling point of 68 to 70° C./1.6 mm-Hg. The experimental analyses were: 1H NMR (CDCl3/Freon 113) δ 4.49 and 4.37 (AB, J=5.5 Hz, 4 H), 4.00 (triplet, J=13.2 Hz, 2 H), 3.70 (singlet, 2 H), and 1.32 (singlet, 3 H); 13C NMR δ 21.02, 40.33, 68.77 (triplet, J=146.2 Hz), 78.60, and 79.87 (signals from carbon bearing fluorine are not included due to complex splitting patterns and low peak intensities); 19F NMR δ −81.3 (3 F), −119.9 (2F), −122.6 (2 F), −123.3 (2 F), −123.5 (2 F), −123.9 (2 F) and −126.8 (2 F). The elemental analysis was: Calculated for C13H11F15O2: C, 32.2; H, 2.3; F, 58.9. Found: C, 32.2; H, 2.2; F, 58.3. the resulting mixture was heated at 75° C. for 16 hours The mixture was cooled to room temperature extracted with two volumes of Freon 113 The combined organic extracts were washed twice with water, once with 2 weight percent aqueous hydrochloric acid and once with brine dried over magnesium sulfate filtered evaporated to give 32 grams of crude product The crude product was distilled under reduced pressure

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of (1S*,2S*)-2-(3-hydroxyphenyl)-N-((R)-1-(5-(2,2,2-trifluoroethoxy)pyridin-2-yl)ethyl)cyclopropanecarboxamide (15 mg, 0.039 mmol), 3-(Chloromethyl)-3-methyloxetane (24 mg, 0.197 mmol) and potassium carbonate (27 mg, 0.197 mmol) in DMF (2 mL) was heated at 70° C. with stirring for 15 hours. The mixture was poured into water, and the aqueous layer was extracted with ethyl acetate, dried over magnesium sulfate and concentrated in vacuo. The residue was purified by preparative LC-MS to give 8.9 mg (49% yield) of the title compound. the aqueous layer was extracted with ethyl acetate dried over magnesium sulfate concentrated in vacuo The residue was purified by preparative LC-MS

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of (1S*,2S*)-2-(3-hydroxyphenyl)-N-((R)-1-(5-(2,2,2-trifluoroethoxy)pyridin-2-yl)ethyl)cyclopropanecarboxamide (15 mg, 0.039 mmol), 3-(Chloromethyl)-3-methyloxetane (24 mg, 0.197 mmol) and potassium carbonate (27 mg, 0.197 mmol) in DMF (2 mL) was heated at 70° C. with stirring for 15 hours. The mixture was poured into water, and the aqueous layer was extracted with ethyl acetate, dried over magnesium sulfate and concentrated in vacuo. The residue was purified by preparative LC-MS to give 8.9 mg (49% yield) of the title compound. the aqueous layer was extracted with ethyl acetate dried over magnesium sulfate concentrated in vacuo The residue was purified by preparative LC-MS