Bicyclization of Enynes Using the Cp2TiCl2−Mg−BTC System: A Practical Method to Bicyclic Cyclopentenones
摘要:
Bicyclic titanacycles 2 generated with the Cp2TiCl2-Mg-P(OEt)(3) system can be trapped with bis(trichloromethyl) carbonate (BTC) to give bicyclic cyclopentenones 3 in good yields. The titanacycle 2m was isolated and well-identified. Bicyclization of enynes containing 1,2-disubstituted olefin by this method gave good results with excellent stereoselectivity.