A mild, chemoselective, one-pot synthesis of δ-keto α-cyano esters by organocatalysis
作者:Gang Liu、Yingcai Wang
DOI:10.1016/j.tetlet.2013.10.145
日期:2014.1
A sequential condensation of α-cyanoesters, aldehydes, and ketones with catalytic amount of pyrrolidine/HOAc at room temperature has been developed. This method offers a chemoselective, one-pot cascade access to δ-keto α-cyanoesters with moderate to good yields under mild conditions.
Synthesis of Highly Substituted 2,3-Dihydro-1<i>H</i>-pyrrole Derivatives via a Tandem Regioselective Addition of Nitrones to 1,3-Enynes with Subsequent Rearrangement
A novel method for the synthesis of 1,3-enynes is described through oxidative cyclization of the semicarbazones of Michael adducts having potential nitrile functionality. Reaction of these 1,3-enynes with diaryl nitrones has yielded a diastereomeric mixture of highly substituted 2,3-dihydro-1H-pyrrole derivatives via a tandem regioselective addition with subsequent rearrangement.