With triethylamine In chloroform at 0℃; for 2h; Reagent/catalyst; Solvent;
Experimental Procedure 2.c c. Preparation of 1-diphenyl sulfide-1-cyclopentylacetone oxime benzyl ester A four-necked flask equipped with a motor-driven stirrer and a thermometer was charged with 102.4 g of diphenyl sulfide cyclopentylacetone oxime (0.30 mol)1200 ml of chloroform,39.5 g of triethylamine (0.39 mol),Stir well,After cooling to 0 ° C, a mixed solution of 50.6 g of benzoyl chloride (0.36 mol) and 50 g of chloroform was added dropwise.After completion of the addition, stirring was continued for 2 hours,1500 ml of cold water was added dropwise,Layered,Once with 500 ml of saturated sodium bicarbonate solution,500 ml of water,1000 ml of 0.5 N hydrochloric acid,500ml washing,Dried over 300 g of anhydrous magnesium sulfate,Filtration,The filtrate was evaporated to remove the solvent,A viscous liquid was obtained.To this was added an appropriate amount of ethanol,To precipitate white solid 1-diphenyl sulfide 1-cyclopentyl acetone oxime benzyl ester, filtration, drying product 104.2g, yield 78%, purity greater than 98%. | 78% |
With triethylamine at 20℃;
Experimental Procedure
Add the triethylamine of 121g,Control the reaction temperature within 10°C, Start stirring, continue to add the benzoyl chloride of 155g; After joining, Warming up to room temperature and continuing the reaction to the end; At room temperature, the reaction solution after the reaction was washed three times with 300 g of ice water;Atmospheric pressure reclaims dichloromethane to dry afterwards;Then add 1080g isopropanol for recrystallization,Filter, dry, finally obtain the OXE01 product of 346g,Has the structure shown in formula 1-1;Yield 78%,The purity is above 99%. | 78% |