Expeditious Synthesis of New 1,2,3-Thiadiazoles and 1,2,3-Selenadiazoles from 1,2-Diaza-1,3-butadienes via Hurd−Mori-Type Reactions
作者:Orazio A. Attanasi、Lucia De Crescentini、Gianfranco Favi、Paolino Filippone、Gianluca Giorgi、Fabio Mantellini、Stefania Santeusanio
DOI:10.1021/jo0264832
日期:2003.3.1
behavior of 1,2,3-thiadiazole 4a in the reaction with 1,2-diaza-1,3-butadienes that produced, under basic conditions, 4-hydrazono-1-(1,2,3-thiadiazolyl)pentane derivatives. This event represents an interesting example of stereoselective synthesis because it leads exclusively to the formation of the RR/SS racemic mixture. These latter compounds, treated with thionyl chloride, gave the corresponding 1,3-di-1
由1,2-二氮杂-1,3-丁二烯和亚甲基或甲基活化的底物获得的α-取代的azo产生了大量的环状化合物。特别是,在亚硫酰氯作为溶剂试剂的存在下,它们在新的4-取代的2,3-二氢-1,2,3-硒代二唑中用氯氧化硒转化为1,2,3-噻二唑(1)。 ,同时用二氧化硒将它们转化为4-取代的1,2,3-硒代二唑。我们还研究了1,2,3-噻二唑4a与1,2,2-二氮杂-1,3-丁二烯在碱性条件下生成4-肼基-1-(1,2,3)的反应中的亲核行为-噻二唑基)戊烷衍生物。此事件代表立体选择性合成的一个有趣示例,因为它仅导致RR / SS外消旋混合物的形成。后面这些化合物,