Poorly reactive 5-piperazin-1-yl-1,3,4-thiadiazol-2-amines rendered as valid substrates for Groebke–Blackburn type multi-component reaction with aldehydes and isocyanides using TMSCl as a promoter
作者:Mikhail Krasavin、Sergey Tsirulnikov、Mikhail Nikulnikov、Volodymyr Kysil、Alexandre Ivachtchenko
DOI:10.1016/j.tetlet.2008.06.113
日期:2008.9
N-Substituted 5-piperazin-1-yl-1,3,4-thiadiazol-2-amines that fail to undergo Groebke–Blackburn type MCR with aldehydes and isocyanides provide fair to good yields of the respective 2-piperazin-1-ylimidazo[2,1-b][1,3,4]thiadiazoles when such reaction is promoted by an equimolar quantity of trimethylsilyl chloride in aprotic medium. These findings further extend the utility of TMSCl as the isocyanide-based
N-取代的5-哌嗪-1-基-1,1,3,4-噻二唑-2-胺无法通过醛和异氰酸酯进行格罗布-布莱克本类型的MCR,可以使各自的2-哌嗪-1-咪唑得到中等至良好的收率当非质子介质中等摩尔量的三甲基甲硅烷基氯促进这种反应时,[2,1- b ] [1,3,4]噻二唑。这些发现进一步扩展了TMSC1作为基于异氰酸酯的MCR促进剂的用途,并且还证明了该硅路易斯酸是该反应的实际促进剂。