反应详情

8.30 g of 3,4-dihydro-2H-1,5-benzothiazepine hydrobromide were placed in 150 ml of THF and deprotonized with 48 ml of 1.55M nBuLi (hexane) under an Argon atmosphere at -10° C. After 1/4 hour, 4.64 ml of Methyl iodide (MeI) were added dropwise to the yellow solution of the Li amide and the mixture was stirred for 1 hour. It was then poured on to ice, extracted with ether, washed with water, dried and evaporated. Column chromatography on silica gel (petroleum ether/ethyl acetate 96/4) yielded 5.70 g of 3,4-dihydro-5-methyl-2H-1,5-benzothiazepine as a colorless oil which was formylated as follows:

1. waitAfter 1/4 hour
2. additionIt was then poured on to ice
3. extractionextracted with ether
4. washwashed with water
5. customdried
6. customevaporated