Cyclopentene Synthesis from 1,3-Dienes via Base-Induced Ring Contraction of 3,6-Dihydro-2<i>H</i>-thiopyrans: Studies on Diastereoselection and Mechanism
作者:Scott D. Larsen、Peter V. Fisher、Brian E. Libby、Randy M. Jensen、Stephen A. Mizsak、William Watt、Warren R. Ronk、Scott T. Hill
DOI:10.1021/jo960537o
日期:1996.1.1
component. In some cases, reducing the temperature during the ring contraction resulted in the isolation of good yields of vinyl cyclopropanes of high isomeric purity. With one substrate, highly diastereoselective rearrangement of a vinyl cyclopropane to a cyclopentene was unambiguously demonstrated, suggesting that this might be a key feature of the overall ring contraction mechanism.