Domino Michael addition-carbene rearrangement-cyclization reaction of 1-alkynyl(aryl)-λ3-bromanes with 2-mercapto-1,3-benzazoles
作者:Masahito Ochiai、Norihiro Tada
DOI:10.1039/b509269h
日期:——
Exposure of 1-alkynyl[p-(trifluoromethyl)phenyl](tetrafluoroborato)-λ3-bromanes to 2-mercaptobenzimidazole or benzothiazole in dichloromethane at 0 °C under argon resulted in a domino Michael additionâcarbene rearrangementâcyclization reaction to produce directly tricyclic heterocycles in high yields, whereas the reaction with 2-mercaptobenzoxazole afforded 1-alkynyl sulfides.
在二氯甲烷中,将 1-炔基[对-(三氟甲基)苯基](四氟硼酸根)-δ "3-溴与 2-巯基苯并咪唑或苯并噻唑在 0 °C 的氩气环境下接触,会发生多米诺迈克尔加成-羰基重排-环化反应,直接生成高产率的三环杂环,而与 2-巯基苯并恶唑的反应则生成 1-炔基硫化物。