The Intramolecular Allenolate Rauhut–Currier Reaction
作者:James A. MacKay、Zachary C. Landis、Stephen E. Motika、Margaret H. Kench
DOI:10.1021/jo3015769
日期:2012.9.7
intramolecular Rauhut–Currierreaction utilizing alkynoates as the initial conjugate acceptor affords densely functionalized 5- and 6-membered rings from ynoate-enoate, ynoate-enenitrile, and alkynyl sulfone-enenitrile substrates. Trialkylphosphines catalyze the reaction, and TMSCN serves as a pronucelophile to effect turnover of the catalyst and the formation of a second C–C bond. Because of the highly electrophilic
Ruthenium-Catalyzed Hydrative Cyclization of 1,5-Enynes
作者:Yiyun Chen、Douglas M. Ho、Chulbom Lee
DOI:10.1021/ja053462r
日期:2005.9.1
ruthenium-catalyzed hydrative cyclization of enynes has been developed. The reaction converts a range of 1,5-enynes bearing terminal alkyne and Michael acceptor moieties into cyclopentanone derivatives. From extensive catalyst screening experiments, a trinuclear ruthenium complex, [Ru3(dppm)3Cl5]PF6, has been identified to be an effective catalyst in mediating the 1,1-difunctionalization of alkynes. It is proposed