Pyrrole Synthesis via Allylic sp<sup>3</sup> C−H Activation of Enamines Followed by Intermolecular Coupling with Unactivated Alkynes
作者:Souvik Rakshit、Frederic W. Patureau、Frank Glorius
DOI:10.1021/ja104305s
日期:2010.7.21
A conceptually novel pyrrole synthesis is reported, efficiently merging enamines and (unactivated) alkynes under oxidative conditions. In an intermolecular Rh catalyzed process, the challenging allylic sp(3) C-H activation of the enamine substrates is followed by the cyclization with the alkyne (R(3) = CO(2)R). Alternatively, in some cases (R(3) = CN), the enamine can be utilized for a vinylic sp(2)
报道了一种概念上新颖的吡咯合成,可在氧化条件下有效地合并烯胺和(未活化的)炔烃。在分子间 Rh 催化过程中,烯胺底物的具有挑战性的烯丙基 sp(3) CH 活化之后是与炔烃 (R(3) = CO(2)R) 的环化。或者,在某些情况下 (R(3) = CN),烯胺可用于乙烯基 sp(2) CH 活化。总共提供了 17 个产率高于 60% 的例子,以及初步机械研究的结果。