Preparation of 5-methyl-2-sulfanyl-7<i>h</i>-1,3,4-thiadiazolo[3,2-<i>a</i>]-pyrimidin-7-ones
作者:Saifidin Safarov、Muhamacho A. Kukaniev、Elena Karpuk、Herbert Meier
DOI:10.1002/jhet.5570440145
日期:2007.1
7H-1,3,4-Thiadiazolo[3,2-a]pyrimidin-7-ones can be prepared by the acylation of 5-amino-1,3,4-thiadiazoles with diketene and subsequent ring closure (dehydration). Whereas arylthio substituents (SC6H5) can be introduced in 2-position by the replacement of Br, alkylthio groups (SC2H5) have to be already presentin the starting 5-amino-1,3,4-thiadiazole. The ambident nucleophile 2-thiazolidinethione reacts
7 H -1,3,4-噻二唑并[3,2- a ]嘧啶-7-酮可以通过将5-氨基-1,3,4-噻二唑与双烯酮酰化并随后进行闭环(脱水)来制备。芳硫基取代基(SC 6 H 5)可以通过取代Br引入2位,而烷基硫基(SC 2 H 5)必须已经存在于起始的5-氨基-1,3,4-噻二唑中。亲环境的亲核试剂2-噻唑烷硫酮在N原子上的Br取代反应中反应。