Reactions of Thioamides and Selenoamides with Hydrazonoyl Chlorides Under Phase-Transfer Conditions. A Convenient Method of Preparation of δ<sup>2</sup>-1,3,4-Thiadiazolines and δ<sup>2</sup>-1,3,4-Selenadiazolines
作者:M. L. Petrov、M. A. Abramov
DOI:10.1080/10426509808545473
日期:1998.2.1
Reactions of enolizable thio- and selenoamides with hydrazonoyl chlorides in the presence of bases and phase-transfer catalysts result in 2-dialkylamino-Δ2-1,3,4-thia- and selenadiazolines. The reactions proceed through formation of corresponding enethiolates and eneselenolates. At 80°C 2-dialkylamino-Δ2-1,3,4-thia- and selenadiazolines eliminate dialkylamines, giving 2-ylidene-Δ2-1,3,4-thia- and selenadiazolines
在碱和相转移催化剂的存在下,可烯醇化的硫代和硒代酰胺与腙酰氯的反应产生 2-二烷基氨基-Δ2-1,3,4-硫代-和硒二唑啉。反应通过形成相应的烯硫醇盐和烯醇盐而进行。在 80°C 下,2-二烷基氨基-Δ2-1,3,4-硫杂-和硒二唑啉消除二烷基胺,以良好的产率得到 2-亚基-Δ2-1,3,4-硫杂-和硒二唑啉。在碱和相转移催化剂的存在下,不可烯醇化硫代酰胺与腙酰氯的反应发生为源自腙酰氯的腈亚胺的 1,3-偶极环加成与 C=S 键,产生 Δ2-1,3,4-噻二唑啉。