Sodium Methoxide → 4-Propyl-1,2,5-thiadiazolidin-3-one 1,1-dioxide

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Reaction Steps

A solution of 2- (aminosulfonyl) aminopentanoic acid methyl ester (13 g; 0.05 retool) in methanol (150 ml) was added to a solution of sodium methoxide (5.54 g, from 2 g of Na) in 150 ml of methanol and the resulting reaction mixture was refluxed for 18 hours. The mixture was cooled, neutralized with BIO-RAD® 50W-X8 H+ ion exchange resin, and filtered. The filtrate was concentrated in vacuo to yield an oil which was crystallized from methanol/hexane to afford 10.8 g (quantitative) of 4-propyl-1,2,5-thiadiazolidin-3-one 1,1-dioxide (Formula IV: R1 =H; R2 =propyl; R3 =H).

Provenance & Evidence