Conformational, steric and electronic effects on the site- and chemoselectivity of the metal-catalyzed reaction of N-bis(trimethylsilyl)methyl, N-(2-indolyl)methyl α-diazoamides
作者:Bao Zhang、Andrew G. H. Wee
DOI:10.1039/c2ob25103e
日期:——
The Rh(II)- and Cu(II)-catalyzed reactions of N-bis(trimethylsilyl)methyl, N-(2-indolyl)methyl α-diazoamides are investigated to delineate how conformational, steric and electronic factors influence the site- and chemoselectivity of the metallocarbenoid reaction. The N-bis(trimethylsilyl)methyl (N-BTMSM) group is found to be essential in promoting the metallocarbenoid reaction at the N-(2-indolyl)methyl
The Bis(trimethylsilyl)methyl Group as an Effective N-Protecting Group and Site-Selective Control Element in Rhodium(II)-Catalyzed Reaction of Diazoamides
作者:Andrew G. H. Wee、Sammy C. Duncan
DOI:10.1021/jo051042e
日期:2005.10.1
varied N-bis(trimethylsilyl)methyl,N-substituted diazoamides is studied. It has been found that in tertiary diazoamides the N-bis(trimethylsilyl)methyl (N-BTMSM) group is effective for conformational control about the amide N−C(O) bond; C−H insertion occurs at the other N-substituent. In Cα-branched diazoamides, the N-BTMSM is found also to exert its influence on the conformationalpreference about the
Formal aromatic C−Hinsertion of rhodium(II) carbenoid was intensively investigated to develop a new methodology and probe its mechanism. Contrasting with the previously proposed directC−Hinsertion, the mechanism was revealed to be electrophilic aromatic substitution, which was supported by substituent effects on the aromatic ring and a secondary deuterium kinetic isotope effect. Various isoquinolinones
Metal-catalyzed reaction of N-(2-indolyl)methyl, N-bis(trimethylsilyl)methyl diazoamides: an entry into the β-carboline ring system
作者:Bao Zhang、Andrew G. H. Wee
DOI:10.1039/b809890e
日期:——
The intramolecular metal-catalyzed reaction of N-(2-indolyl)methyl, N-bis(TMS)methyl diazoamides proceeds with high conformational control and chemoselectivity to give cyclopropyl derivatives, which rearrange to beta-carboline products.