摘要:
The intramolecular coupling of conjugated enynes with cyclopropylcarbene complexes has been investigated. The desired products of the reaction, alpha-alkenylcyclopentenones, were minor products of the reaction. Competing reaction processes included double bond reduction and allylic C-H activation. Intramolecular coupling of selenium-containing alkynes and cyclopropylcarbene complexes followed by oxidation/elimination provided a more efficient route to a-alkenylcyclopentenones. (C) 1999 Elsevier Science S.A. All rights reserved.