A range of hydrazono chlorides 8, readily prepared from 5-substituted tetrazoles 7 and Appel salt 1, are rapidly converted by triphenylphosphine into 5-cyano-1,3,4-thiadiazoles 9 in high yield. These cyanides are converted by azide into the corresponding tetrazoles 10 which with Appel salt give the hydrazono chlorides 11 which are similarly converted by triphenylphosphine into the bi-1,3,4-thiadiazolyls 12a,c,g, all in high yield. Repetition of the 3-step sequence (12
→
13
→
14
→
15)
gives the ter-1,3,4-thiadiazolyls 15a,g.
由 5-取代的
四唑 7 和阿贝尔盐 1 很容易制备出一系列
肼基
氯化物 8,这些
肼基
氯化物在
三苯基膦的作用下迅速转化为 5-
氰基-1,3,4-
噻二唑 9,产量很高。这些
氰化物被
叠氮化物转化为相应的
四唑 10,与阿佩尔盐一起生成
肼基
氯化物 11,这些
肼基
氯化物 11 同样被
三苯基膦转化为双-1,3,4-
噻二唑 12a,c,g,产量都很高。重复 3 步顺序(12 → 13 → 14 → 15),可得到 1,3,4-
噻二唑三醇 15a,g。