Pauson–Khand reactions catalyzed by entrapped rhodium complexes
作者:Kang Hyun Park、Seung Uk Son、Young Keun Chung
DOI:10.1016/s0040-4039(03)00434-9
日期:2003.3
An entrapped Rh complex prepared by a sol–gel process has been used as a catalyst in the Pauson–Khandreaction under mild reaction conditions; the catalyst is easily recovered and reused at least 10 times without losing catalyst activity.
Stereoselective [4 + 1] Annulation Reactions with Silyl Vinylketenes Derived from Fischer Carbene Complexes
作者:William H. Moser、Laura A. Feltes、Liangdong Sun、Matthew W. Giese、Ryan W. Farrell
DOI:10.1021/jo060994x
日期:2006.8.1
Stable silyl vinylketenes were prepared via the thermal reaction of Fischercarbenecomplexes with triisopropylsilyl- or tert-butyldimethylsilyl-substituted alkynes. The ability of these silyl vinylketenes to participate with carbenoid reagents in [4 + 1] annulation reactions was investigated. The best results were obtained with diazomethane and substituted diazomethane reagents, which provided cyclopentenone