3-isothiocyanatopropanenitrile

Conditions: temp:-5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1.1 g of tertiary-butoxy potassium and 2 ml of a dimethylformamide solution of 2 g of 2-cyanoethyl isothiocyanate were subsequently added to a mixture of 2.6 g of 6-pentafluoroethyl-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-3-one and 28 ml of dimethylformamide while stirring at -5° C., followed by stirring at 5° C. for 15 hours. Then, 2N hydrochloric acid was added thereto, and the mixture was extracted with ether. After washing the organic layer with water and drying, the residue obtained by distilling off the solvent was purified by silica gel column chromatography (a developing solution, hexane:methylene chloride=1:2) to obtain 2.6 g of N-(2-cyanoethyl)-6-pentafluoroethyl-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbamide. 2.1 g of sodium cyanoborohydride was added to a mixture of 2.6 g of N-(2-cyanoethyl)-6-pentafluoroethyl-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbamide obtained above, 15 ml of acetic acid and 45 ml of tetrahydrofuran while ice-cooling and stirring, and the resulting mixture was stirred at room temperature for 13 hours. The mixture was diluted with ethyl acetate, and, after washing the organic layer with a saturated aqueous solution of sodium bicarbonate and water and drying, the solvent was distilled off to obtain 2.6 g of N-(2-cyanoethyl)-6-pentafluoroethyl-3,4-dihydro-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbamide. Then, the product was added to 90 ml of pyridine and 3.4 g of tosyl chloride, and the mixture was heated while refluxing for 1 hour. After concentration under reduced pressure, water and concentrated hydrochloric acid were added thereto, followed by extracting with methylene chloride. After washing the organic layer with water and drying, the residue obtained by distilling off the solvent was purified by silica gel column chromatography (a developing solution, hexane:ethyl acetate=1:1) to obtain 460 mg of N-(2-cyanoethyl)-6-pentafluoroethyl-2,2-dimethyl-2H-1-benzopyran-4-carbamide having a melting point of 163°-164° C. by stirring at 5° C. for 15 hours the mixture was extracted with ether After washing the organic layer with water drying the residue obtained by distilling off the solvent was purified by silica gel column chromatography (a developing solution, hexane

Conditions: temp:-5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1.1 g of tertiary-butoxy potassium and 2 ml of a dimethylformamide solution of 2 g of 2-cyanoethyl isothiocyanate were subsequently added to a mixture of 2.6 g of 6-pentafluoroethyl-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-3-one and 28 ml of dimethylformamide while stirring at -5° C., followed by stirring at 5° C. for 15 hours. Then, 2N hydrochloric acid was added thereto, and the mixture was extracted with ether. After washing the organic layer with water and drying, the residue obtained by distilling off the solvent was purified by silica gel column chromatography (a developing solution, hexane:methylene chloride=1:2) to obtain 2.6 g of N-(2-cyanoethyl)-6-pentafluoroethyl-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbamide. 2.1 g of sodium cyanoborohydride was added to a mixture of 2.6 g of N-(2-cyanoethyl)-6-pentafluoroethyl-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbamide obtained above, 15 ml of acetic acid and 45 ml of tetrahydrofuran while ice-cooling and stirring, and the resulting mixture was stirred at room temperature for 13 hours. The mixture was diluted with ethyl acetate, and, after washing the organic layer with a saturated aqueous solution of sodium bicarbonate and water and drying, the solvent was distilled off to obtain 2.6 g of N-(2-cyanoethyl)-6-pentafluoroethyl-3,4-dihydro-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbamide. Then, the product was added to 90 ml of pyridine and 3.4 g of tosyl chloride, and the mixture was heated while refluxing for 1 hour. After concentration under reduced pressure, water and concentrated hydrochloric acid were added thereto, followed by extracting with methylene chloride. After washing the organic layer with water and drying, the residue obtained by distilling off the solvent was purified by silica gel column chromatography (a developing solution, hexane:ethyl acetate=1:1) to obtain 460 mg of N-(2-cyanoethyl)-6-pentafluoroethyl-2,2-dimethyl-2H-1-benzopyran-4-carbamide having a melting point of 163°-164° C. by stirring at 5° C. for 15 hours the mixture was extracted with ether After washing the organic layer with water drying the residue obtained by distilling off the solvent was purified by silica gel column chromatography (a developing solution, hexane

Conditions: temp:-5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1.1 g of tertiary-butoxy potassium and 2 ml of a dimethylformamide solution of 2 g of 2-cyanoethyl isothiocyanate were subsequently added to a mixture of 2.6 g of 6-pentafluoroethyl-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-3-one and 28 ml of dimethylformamide while stirring at -5° C., followed by stirring at 5° C. for 15 hours. Then, 2N hydrochloric acid was added thereto, and the mixture was extracted with ether. After washing the organic layer with water and drying, the residue obtained by distilling off the solvent was purified by silica gel column chromatography (a developing solution, hexane:methylene chloride=1:2) to obtain 2.6 g of N-(2-cyanoethyl)-6-pentafluoroethyl-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbamide. 2.1 g of sodium cyanoborohydride was added to a mixture of 2.6 g of N-(2-cyanoethyl)-6-pentafluoroethyl-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbamide obtained above, 15 ml of acetic acid and 45 ml of tetrahydrofuran while ice-cooling and stirring, and the resulting mixture was stirred at room temperature for 13 hours. The mixture was diluted with ethyl acetate, and, after washing the organic layer with a saturated aqueous solution of sodium bicarbonate and water and drying, the solvent was distilled off to obtain 2.6 g of N-(2-cyanoethyl)-6-pentafluoroethyl-3,4-dihydro-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbamide. Then, the product was added to 90 ml of pyridine and 3.4 g of tosyl chloride, and the mixture was heated while refluxing for 1 hour. After concentration under reduced pressure, water and concentrated hydrochloric acid were added thereto, followed by extracting with methylene chloride. After washing the organic layer with water and drying, the residue obtained by distilling off the solvent was purified by silica gel column chromatography (a developing solution, hexane:ethyl acetate=1:1) to obtain 460 mg of N-(2-cyanoethyl)-6-pentafluoroethyl-2,2-dimethyl-2H-1-benzopyran-4-carbamide having a melting point of 163°-164° C. by stirring at 5° C. for 15 hours the mixture was extracted with ether After washing the organic layer with water drying the residue obtained by distilling off the solvent was purified by silica gel column chromatography (a developing solution, hexane

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

Procedure: An amount (103 mg) of 4-bromo-2,2-bis(fluoromethyl)-6-trifluoromethyl-2H-1-benzopyran was dissolved in diethyl ether (0.5 ml); to the solution, 1.68 M n-butyllithium (0.18 ml) was added at −10° C. under a nitrogen atmosphere. After stirring the reaction mixture for 10 minutes, copper(I) cyanide (27 mg) and tetrahydrofuran (0.6 ml) were added and the resulting mixture was stirred for 30 minutes at 0° C. Subsequently, a tetrahydrofuran solution (0.3 ml) of 2-cyanoethyl isothiocyanate (34 mg) was added and the mixture was stirred for 4 hours at 0° C. To the reaction mixture, a saturated aqueous solution of ammonium chloride was added, followed by extraction with diethyl ether; the resulting organic layer was washed with 2 N HCl, a saturated aqueous solution of sodium hydrogencarbonate and a saturated aqueous solution of sodium chloride, dried with anhydrous sodium sulfate and concentrated under reduced pressure; the resulting residue was subjected to silica gel column chromatography (eluent; dichloromethane/diethyl ether=10/1) to give the titled compound (8 mg), which was identical to the authentic sample. the resulting mixture was stirred for 30 minutes at 0° C the mixture was stirred for 4 hours at 0° C followed by extraction with diethyl ether the resulting organic layer was washed with 2 N HCl a saturated aqueous solution of sodium hydrogencarbonate and a saturated aqueous solution of sodium chloride, dried with anhydrous sodium sulfate concentrated under reduced pressure

Conditions: temp:-5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1.1 g of tertiary-butoxy potassium and 2 ml of a dimethylformamide solution of 2 g of 2-cyanoethyl isothiocyanate were subsequently added to a mixture of 2.6 g of 6-pentafluoroethyl-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-3-one and 28 ml of dimethylformamide while stirring at -5° C., followed by stirring at 5° C. for 15 hours. Then, 2N hydrochloric acid was added thereto, and the mixture was extracted with ether. After washing the organic layer with water and drying, the residue obtained by distilling off the solvent was purified by silica gel column chromatography (a developing solution, hexane:methylene chloride=1:2) to obtain 2.6 g of N-(2-cyanoethyl)-6-pentafluoroethyl-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbamide. 2.1 g of sodium cyanoborohydride was added to a mixture of 2.6 g of N-(2-cyanoethyl)-6-pentafluoroethyl-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbamide obtained above, 15 ml of acetic acid and 45 ml of tetrahydrofuran while ice-cooling and stirring, and the resulting mixture was stirred at room temperature for 13 hours. The mixture was diluted with ethyl acetate, and, after washing the organic layer with a saturated aqueous solution of sodium bicarbonate and water and drying, the solvent was distilled off to obtain 2.6 g of N-(2-cyanoethyl)-6-pentafluoroethyl-3,4-dihydro-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbamide. Then, the product was added to 90 ml of pyridine and 3.4 g of tosyl chloride, and the mixture was heated while refluxing for 1 hour. After concentration under reduced pressure, water and concentrated hydrochloric acid were added thereto, followed by extracting with methylene chloride. After washing the organic layer with water and drying, the residue obtained by distilling off the solvent was purified by silica gel column chromatography (a developing solution, hexane:ethyl acetate=1:1) to obtain 460 mg of N-(2-cyanoethyl)-6-pentafluoroethyl-2,2-dimethyl-2H-1-benzopyran-4-carbamide having a melting point of 163°-164° C. by stirring at 5° C. for 15 hours the mixture was extracted with ether After washing the organic layer with water drying the residue obtained by distilling off the solvent was purified by silica gel column chromatography (a developing solution, hexane