反应详情

A solution of N-(aminosulfonyl)-2-(3-methylbutyl)-sarcosine methyl ester (12.28 g, 48.67 mmol) in methanol (150 ml) was added under nitrogen to a solution of sodium methoxide (Na=2.1 g, 95.71 mmol) ) in 150 ml of ice-cold methanol. The resulting reaction mixture was stirred at room temperature under nitrogen for 1.5 hours, and the mixture was treated with 25 g of ion-exchange resin (BIO-RAD 50W-x8 H+) 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 =H; R2= (CH2)2CH (CH3)2 ; R3 =CH3) as a solid, m.p. 212°-214° C.

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