Diastereoselective Synthesis of Piperazines by Manganese-Mediated Reductive Cyclization
作者:Gregory J. Mercer、Matthew S. Sigman
DOI:10.1021/ol034469l
日期:2003.5.1
A simple and effective synthesis of trans aryl-substituted piperazines using a Bronsted acid and manganese(0) is described. [reaction: see text]
描述了一种使用布朗斯台德酸和锰(0)的简单有效的合成反式芳基取代的哌嗪的方法。[反应:看文字]
Electroorganic chemistry. 129. Electroreductive synthesis of chiral piperazines and enantioselective addition of diethylzinc to aldehydes in the presence of the chiral piperazines
Electroreduction of diimines, prepared from 1,2-diamines and aromatic aldehydes, in acidic media gave intramolecularly coupled products, 2,3-diarylpiperazines, stereoselectively. Chiral tri- and tetrasubstituted piperazines were synthesized effectively from chiral 1,2-diamines by the same electroreductive method. Chiral piperazines, prepared from 1(R),2(R)-diaminocyclohexane were effective chiral ligands of catalysts for the enantioselective addition of diethylzinc to aldehydes.