Synthese von heterocyclen. V. 1, 3, 4-thiadiazol-2 (3H)-one
作者:Haukur Kristinsson、Tammo Winkler
DOI:10.1002/hlca.19820650833
日期:1982.12.15
A new and highly versatile method for the synthesis of 1, 3, 4-thiadiazol-2 (3 H)ones 1 is described. Methoxy-1,3,4-thiadiazoles- 5, which are readily available by condensation of O-methyl thiocarbazate (2) with acid derivatives 3, undergo an efficient cleavage to 1 and methyl chloride with hydrochloric acid in an anhydrous medium. Many new 5-substituted thiadiazolones, unavailable by earlier routes