An Efficient Synthesis of 3-Substituted 3H-Pyrimidin-4-ones
摘要:
[GRAPHICS]A novel and practical synthesis of 3-substituted 3H-pyrimidin-4-ones is described. The key step involves the cyclization of enamide esters, derived from readily available beta-keto esters, with trimethylaluminum and various primary amines.
An Efficient Synthesis of 3-Substituted 3H-Pyrimidin-4-ones
摘要:
[GRAPHICS]A novel and practical synthesis of 3-substituted 3H-pyrimidin-4-ones is described. The key step involves the cyclization of enamide esters, derived from readily available beta-keto esters, with trimethylaluminum and various primary amines.
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)