Published in
American Chemical Society, Journal of Organic Chemistry, 25(63), p. 9285-9291, 1998
DOI: 10.1021/jo9810718
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Bicyclization of Enynes Using the Cp2TiCl2−Mg−BTC System: A Practical Method to Bicyclic Cyclopentenones
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Abstract
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.