4-hydroxy-N,N-dimethylbutanamide

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:; See reaction.notes.procedure_details.

Procedure: A solution of (±)-2-(2-naphthylmethoxy)-3,3,3-trifluoro-2-methylpropionyl chloride (3.0 g.) in tetrahydrofuran (70 ml.) is added, dropwise at 0° C., to a stirred solution of 4-hydroxy-N,N-dimethylbutyramide (1.20 g.) and triethylamine (2.1 g.) in tetrahydrofuran (35 ml.). The mixture is stored for two days. The solid is filtered off and washed with ether, and the filtrate and washings are evaporated. The residue is dissolved in ether and the solution is washed with water, 0.4 N aqueous sodium hydroxide, and water, dried with magnesium sulphate, and evaporated. The residue is crystallised from a mixture of light petroleum (b.p. 40°-60° C.) and ether to give (±)-3-dimethylcarbamoylpropyl 2-(2-naphthylmethoxy)-3,3,3-trifluoro-2-methylpropionate (1.3 g.) m.p. 42°-43° C. The solid is filtered off washed with ether the filtrate and washings are evaporated The residue is dissolved in ether the solution is washed with water, 0.4 N aqueous sodium hydroxide, and water dried with magnesium sulphate evaporated The residue is crystallised from a mixture of light petroleum (b.p. 40°-60° C.) and ether

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

Procedure: A solution of 2-[4-(4-chlorophenyl)benzyloxy]-3,3,3-trifluoro-2-trifluoromethylpropionyl chloride (3.10 g.) in tetrahydrofuran (10 ml.) is added dropwise at 0° C. to a stirred mixture of 4-hydroxy-N,N-dimethylbutyramide (885 mg.), triethylamine (773 mg.) and tetrahydrofuran (15 ml.). The mixture is kept at room temperature for 4 hours with stirring, and for 2 days without stirring, then filtered. The filtrate is evaporated, and the residue dissolved in ether. The solution is washed with water, 0.4 N-aqueous sodium hydroxide, N-hydrochloric acid and water again, dried and evaporated to a syrup (3.3 g.). The syrup is dissolved in toluene (10 ml.) and applied to a column of silica gel (90 g.). The column is washed with toluene (700 ml.), and then eluted with ether (900 ml.). The ether is evaporated, and the residue is recrystallised from ether-light petroleum (b.p. 40°-60° C.) to give 3-dimethylcarbamoylpropyl 2-[4-(4-chlorophenyl)benzyloxy]-3,3,3-trifluoro-2-trifluoromethyl-propionate (2.1 g.), m.p. 54°-55° C. for 2 days without stirring filtered The filtrate is evaporated the residue dissolved in ether The solution is washed with water, 0.4 N-aqueous sodium hydroxide, N-hydrochloric acid and water again dried evaporated to a syrup (3.3 g.) The syrup is dissolved in toluene (10 ml.) The column is washed with toluene (700 ml.) eluted with ether (900 ml.) The ether is evaporated the residue is recrystallised from ether-light petroleum (b.p. 40°-60° C.)

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

Procedure: A solution of 2-[4-(4-chlorophenyl)benzyloxy]-3,3,3-trifluoro-2-trifluoromethylpropionyl chloride (3.10 g.) in tetrahydrofuran (10 ml.) is added dropwise at 0° C. to a stirred mixture of 4-hydroxy-N,N-dimethylbutyramide (885 mg.), triethylamine (773 mg.) and tetrahydrofuran (15 ml.). The mixture is kept at room temperature for 4 hours with stirring, and for 2 days without stirring, then filtered. The filtrate is evaporated, and the residue dissolved in ether. The solution is washed with water, 0.4 N-aqueous sodium hydroxide, N-hydrochloric acid and water again, dried and evaporated to a syrup (3.3 g.). The syrup is dissolved in toluene (10 ml.) and applied to a column of silica gel (90 g.). The column is washed with toluene (700 ml.), and then eluted with ether (900 ml.). The ether is evaporated, and the residue is recrystallised from ether-light petroleum (b.p. 40°-60° C.) to give 3-dimethylcarbamoylpropyl 2-[4-(4-chlorophenyl)benzyloxy]-3,3,3-trifluoro-2-trifluoromethyl-propionate (2.1 g.), m.p. 54°-55° C. for 2 days without stirring filtered The filtrate is evaporated the residue dissolved in ether The solution is washed with water, 0.4 N-aqueous sodium hydroxide, N-hydrochloric acid and water again dried evaporated to a syrup (3.3 g.) The syrup is dissolved in toluene (10 ml.) The column is washed with toluene (700 ml.) eluted with ether (900 ml.) The ether is evaporated the residue is recrystallised from ether-light petroleum (b.p. 40°-60° C.)

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

Procedure: A solution of (±)-2-(2-naphthylmethoxy)-3,3,3-trifluoro-2-methylpropionyl chloride (3.0 g.) in tetrahydrofuran (70 ml.) is added, dropwise at 0° C., to a stirred solution of 4-hydroxy-N,N-dimethylbutyramide (1.20 g.) and triethylamine (2.1 g.) in tetrahydrofuran (35 ml.). The mixture is stored for 2 days. The solid is filtered off and washed with ether, and the filtrate and washings are evaporated. The residue is dissolved in ether and the solution is washed with water, 0.4 N aqueous sodium hydroxide, and water, dried with magnesium sulphate, and evaporated. The residue is crystallised from a mixture of light petroleum (b.p. 40°-60° C.) and ether to give (±)-3-dimethylcarbamoylpropyl 2-(2-naphthylmethoxy)-3,3,3-trifluoro-2-methylpropionate (1.3 g.) m.p. 42°-43° C. The solid is filtered off washed with ether the filtrate and washings are evaporated The residue is dissolved in ether the solution is washed with water, 0.4 N aqueous sodium hydroxide, and water dried with magnesium sulphate evaporated The residue is crystallised from a mixture of light petroleum (b.p. 40°-60° C.) and ether

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

Procedure: A solution of (±)-2-(2-naphthylmethoxy)-3,3,3-trifluoro-2-methylpropionyl chloride (3.0 g.) in tetrahydrofuran (70 ml.) is added, dropwise at 0° C., to a stirred solution of 4-hydroxy-N,N-dimethylbutyramide (1.20 g.) and triethylamine (2.1 g.) in tetrahydrofuran (35 ml.). The mixture is stored for 2 days. The solid is filtered off and washed with ether, and the filtrate and washings are evaporated. The residue is dissolved in ether and the solution is washed with water, 0.4 N aqueous sodium hydroxide, and water, dried with magnesium sulphate, and evaporated. The residue is crystallised from a mixture of light petroleum (b.p. 40°-60° C.) and ether to give (±)-3-dimethylcarbamoylpropyl 2-(2-naphthylmethoxy)-3,3,3-trifluoro-2-methylpropionate (1.3 g.) m.p. 42°-43° C. The solid is filtered off washed with ether the filtrate and washings are evaporated The residue is dissolved in ether the solution is washed with water, 0.4 N aqueous sodium hydroxide, and water dried with magnesium sulphate evaporated The residue is crystallised from a mixture of light petroleum (b.p. 40°-60° C.) and ether

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

Procedure: A solution of 2-[4-(4-chlorophenyl)benzyloxy]-3,3,3-trifluoro-2-trifluoromethylpropionyl chloride (3.10 g.) in tetrahydrofuran (10 ml.) is added dropwise at 0° C. to a stirred mixture of 4-hydroxy-N,N-dimethylbutyramide (885 mg.), triethylamine (773 mg.) and tetrahydrofuran (15 ml.). The mixture is kept at room temperature for 4 hours with stirring, and for 2 days without stirring, then filtered. The filtrate is evaporated, and the residue dissolved in ether. The solution is washed with water, 0.4 N-aqueous sodium hydroxide, N-hydrochloric acid and water again, dried and evaporated to a syrup (3.3 g.). The syrup is dissolved in toluene (10 ml.) and applied to a column of silica gel (90 g.). The column is washed with toluene (700 ml.), and then eluted with ether (900 ml.). The ether is evaporated, and the residue is recrystallised from ether-light petroleum (b.p. 40-60° C.) to give 3-dimethylcarbamoylpropyl 2-[4-(4-chlorophenyl)benzyloxy]-3,3,3-trifluoro-2-trifluoromethylpropionate (2.1 g.), m.p. 54°-55° C. for 2 days without stirring filtered The filtrate is evaporated the residue dissolved in ether The solution is washed with water, 0.4 N-aqueous sodium hydroxide, N-hydrochloric acid and water again dried evaporated to a syrup (3.3 g.) The syrup is dissolved in toluene (10 ml.) The column is washed with toluene (700 ml.) eluted with ether (900 ml.) The ether is evaporated the residue is recrystallised from ether-light petroleum (b.p. 40-60° C.)

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

Procedure: A solution of 2-[4-(4-chlorophenyl)benzyloxy]-3,3,3-trifluoro-2-trifluoromethylpropionyl chloride (3.10 g.) in tetrahydrofuran (10 ml.) is added dropwise at 0° C. to a stirred mixture of 4-hydroxy-N,N-dimethylbutyramide (885 mg.), triethylamine (773 mg.) and tetrahydrofuran (15 ml.). The mixture is kept at room temperature for 4 hours with stirring, and for 2 days without stirring, then filtered. The filtrate is evaporated, and the residue dissolved in ether. The solution is washed with water, 0.4 N-aqueous sodium hydroxide, N-hydrochloric acid and water again, dried and evaporated to a syrup (3.3 g.). The syrup is dissolved in toluene (10 ml.) and applied to a column of silica gel (90 g.). The column is washed with toluene (700 ml.), and then eluted with ether (900 ml.). The ether is evaporated, and the residue is recrystallised from ether-light petroleum (b.p. 40-60° C.) to give 3-dimethylcarbamoylpropyl 2-[4-(4-chlorophenyl)benzyloxy]-3,3,3-trifluoro-2-trifluoromethylpropionate (2.1 g.), m.p. 54°-55° C. for 2 days without stirring filtered The filtrate is evaporated the residue dissolved in ether The solution is washed with water, 0.4 N-aqueous sodium hydroxide, N-hydrochloric acid and water again dried evaporated to a syrup (3.3 g.) The syrup is dissolved in toluene (10 ml.) The column is washed with toluene (700 ml.) eluted with ether (900 ml.) The ether is evaporated the residue is recrystallised from ether-light petroleum (b.p. 40-60° C.)

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

Procedure: A solution of (±)-2-(2-naphthylmethoxy)-3,3,3-trifluoro-2-methylpropionyl chloride (3.0 g.) in tetrahydrofuran (70 ml.) is added, dropwise at 0° C., to a stirred solution of 4-hydroxy-N,N-dimethylbutyramide (1.20 g.) and triethylamine (2.1 g.) in tetrahydrofuran (35 ml.). The mixture is stored for two days. The solid is filtered off and washed with ether, and the filtrate and washings are evaporated. The residue is dissolved in ether and the solution is washed with water, 0.4 N aqueous sodium hydroxide, and water, dried with magnesium sulphate, and evaporated. The residue is crystallised from a mixture of light petroleum (b.p. 40°-60° C.) and ether to give (±)-3-dimethylcarbamoylpropyl 2-(2-naphthylmethoxy)-3,3,3-trifluoro-2-methylpropionate (1.3 g.) m.p. 42°-43° C. The solid is filtered off washed with ether the filtrate and washings are evaporated The residue is dissolved in ether the solution is washed with water, 0.4 N aqueous sodium hydroxide, and water dried with magnesium sulphate evaporated The residue is crystallised from a mixture of light petroleum (b.p. 40°-60° C.) and ether

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

Procedure: A solution of 2-[4-(4-chlorophenyl)benzyloxy]-3,3,3-trifluoro-2-trifluoromethylpropionyl chloride (3.10 g.) in tetrahydrofuran (10 ml.) is added dropwise at 0° C. to a stirred mixture of 4-hydroxy-N,N-dimethylbutyramide (885 mg.), triethylamine (773 mg.) and tetrahydrofuran (15 ml.). The mixture is kept at room temperature for 4 hours with stirring, and for 2 days without stirring, then filtered. The filtrate is evaporated, and the residue dissolved in ether. The solution is washed with water, 0.4 N-aqueous sodium hydroxide, N-hydrochloric acid and water again, dried and evaporated to a syrup (3.3 g.). The syrup is dissolved in toluene (10 ml.) and applied to a column of silica gel (90 g.). The column is washed with toluene (700 ml.), and then eluted with ether (900 ml.). The ether is evaporated, and the residue is recrystallised from ether-light petroleum (b.p. 40°-60° C.) to give 3-dimethylcarbamoylpropyl 2-[4-(4-chlorophenyl)benzyloxy]-3,3,3-trifluoro-2-trifluoromethyl-propionate (2.1 g.), m.p. 54°-55° C. for 2 days without stirring filtered The filtrate is evaporated the residue dissolved in ether The solution is washed with water, 0.4 N-aqueous sodium hydroxide, N-hydrochloric acid and water again dried evaporated to a syrup (3.3 g.) The syrup is dissolved in toluene (10 ml.) The column is washed with toluene (700 ml.) eluted with ether (900 ml.) The ether is evaporated the residue is recrystallised from ether-light petroleum (b.p. 40°-60° C.)