Stereoselective synthesis and applications of nitrogen substituted donor–acceptor cyclopropanes (N-DACs) in the divergent synthesis of azacycles
作者:Santosh J. Gharpure、U. Vijayasree、S. Raja Bhushan Reddy
DOI:10.1039/c2ob06591f
日期:——
A new, highly stereoselective intramolecular cyclopropanation of vinylogous carbamates with carbenes in the presence of Cu(acac)2 as the catalyst has been developed for the construction of cyclopropapyrrolidinones. The âsynâ isomer of N-DAC can be converted to the âantiâ isomer by simple silica gel treatment. Regioselective cleavage of each of the cyclopropane bonds of these two acceptor substituted N-DACs led to a diverse array of azacycles.