Cu-Catalyzed Conversion of Propargyl Acetates to <i>E</i>-α,β-Unsaturated Amides via Ketenimine Formation with Sulfonyl Azides
作者:Yalla Kiran Kumar、Gadi Ranjith Kumar、Maddi Sridhar Reddy
DOI:10.1021/jo402570t
日期:2014.1.17
β-unsaturated N-tosylamides via N-sulfonyl ketenimine formation followed by a probable 1,3-OAc migration ([3,3]-sigmatropic rearrangement). The reaction is very general, allowing all kinds of substitution, including alkyl, aryl (electron-donating, -withdrawing, and -neutral), heteroaryl, and vinyl groups, on the C-terminal of acrylamide. Also, the method affords the products at ambient temperature
在CuI催化剂存在下,易得的炔丙基乙酸酯与磺酰叠氮化物之间的反应通过N-磺酰基酮亚胺的形成产生反式-α,β-不饱和N-甲苯磺酰胺,然后可能发生1,3-OAc迁移([3,3]- σ重排)。该反应非常普遍,允许在丙烯酰胺的C端进行各种取代,包括烷基,芳基(供电子,吸电子和-中性),杂芳基和乙烯基。同样,该方法在环境温度下以中等至良好的产率提供了优异的非对映选择性。