The ligand-free Co-catalyzed chemoselective reductive cyclization cascade of enone-tethered aldehydes with i-PrOH as the environmentally benign hydrogen surrogate is developed by this study. Mechanistic studies disclosed that such a protocol is initiated by an ortho-enone-assisted Co(I)-catalyzed reduction of the aldehyde functionality with i-PrOH. Meanwhile, the selectivity from the Michael–Aldol
Stereoselective synthesis of aminoindanols via an efficient cascade aza-Michael–aldol reaction
作者:Hui Qian、Wanxiang Zhao、Herman H-Y. Sung、Ian D. Williams、Jianwei Sun
DOI:10.1039/c2cc37102b
日期:——
An efficient organocatalyzed strategy for the synthesis of 3-amino-1-indanols has been developed. This method is complementary to the conventional FriedelâCrafts strategy. It is also applicable to the synthesis of enantioenriched 3-amino-1-indanols.
Tandem Michael addition/intramolecular isocyanide [3 + 2] cycloaddition: highly diastereoselective one pot synthesis of fused oxazolines
作者:Lingjuan Zhang、Xianxiu Xu、Jing Tan、Ling Pan、Wenming Xia、Qun Liu
DOI:10.1039/c001617a
日期:——
A base-catalyzed tandem Michael addition/intramolecular isocyanide [3 + 2] cycloaddition of ethyl isocyanoacetate and Michael acceptors with tethered carbonyl groups is described. This reaction leads to the formation of fused oxazolines in a highlydiastereoselective manner under very mild conditions.
Diastereoselective Synthesis of Indanes via a Domino Stetter−Michael Reaction
作者:Eduardo Sánchez-Larios、Michel Gravel
DOI:10.1021/jo901468h
日期:2009.10.2
N-Heterocyclic carbenes were found to catalyze a domino Stetter−Michael reaction for the synthesis of indanes. The products were obtained in good yield and diastereomeric ratio, allowing access to highly functionalized indanes under mild conditions. In addition, the functional groups present on the indanes could be used for the synthesis of polycyclic pyrroles.
Stereoselective Rh<sup>I</sup>-Catalyzed Tandem Conjugate Addition of Boronic Acids−Michael Cyclization
作者:Cristina Navarro、Aurelio G. Csákÿ
DOI:10.1021/ol702571c
日期:2008.1.1
The first examples of the stereoselective sequence RhI-catalyzed tandem conjugateaddition of boronic acids to enones-Michael cyclization, is reported. The reaction is carried out in dioxane-H2O at rt, and 1,2,3-trisubstituted indans are obtained in a highly regio- and stereoselective fashion.