反应详情

A solution of N-(aminosulfonyl)-2-(3-methylbutyl)sarcosine methyl ester (12.25 g, 48.17 mmol) in methanol (150 ml) was added to a solution of sodium methoxide (Na=2.4 g) in 150 ml of ice-cold methanol. The resulting reaction mixture was stirred at room temperature under nitrogen for 18.5 hours, and then the mixture was treated with 25 g of ion-exchange resin (BIO RAD® 50W x 8; 200-400 mesh) for 40 minutes and filtered. The filtrate was concentrated in vacuo to afford 10.7 g (99.8%) of 4- (3-methylbutyl)-5-methyl--1,2,5-thiadiazolidin-3-one 1,1-dioxide (Formula IV: R1 =(CH2)2CH(CH3)2 ; R2 =H; R3 =CH3) as a solid, m.p. 212°-214° C.

1. customThe resulting reaction mixture
2. filtrationfiltered
3. concentrationThe filtrate was concentrated in vacuo