Cinchonamine Squaramide Catalyzed Asymmetric aza-Michael Reaction: Dihydroisoquinolines and Tetrahydropyridines
作者:Tarun Kumar Roy、Biswajit Parhi、Prasanta Ghorai
DOI:10.1002/anie.201805020
日期:2018.7.20
The first example of a chiral cinchona‐squaramide catalyzed enantioselective intramolecular aza‐Michaeladdition for the synthesis of dihydroisoquinolines and tetrahydropyridines has been developed. In general, good yields and excellent enantioselctivities were observed. Broad classes of Michael acceptors, such as enones, esters, thioesters, and Weinreb amides, were successful substrates. The possibility
Highly stereoselective synthesis of indanes with four stereogenic centers via sequential Michael reaction and [3+2] cycloaddition
作者:Pei Juan Chua、Bin Tan、Limin Yang、Xiaofei Zeng、Di Zhu、Guofu Zhong
DOI:10.1039/c0cc01577f
日期:——
A highly efficient organocatalytic sequential reaction involving Michaeladdition of bis(phenylsulfonyl)ethylene, in situ condensation and intramolecular nitrone [3+2] cycloaddition with a variety of aldehydes and hydroxyamines to afford a single diastereomer of indanes with four stereogenic centers in excellent yields and stereoselectivities was developed.