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
研究了N-双(三甲基甲硅烷基)甲基,N-(2-吲哚基)甲基α-重氮酰胺的Rh(II)和Cu(II)催化反应,以描述构象,空间和电子因素如何影响位点和金属类化合物反应的化学选择性。所述Ñ双(三甲基硅烷基)甲基(Ñ -BTMSM)基团被发现是在促进在所述metallocarbenoid反应必需ñ - (2-吲哚基)甲基部分,以及提供有关酰胺N-C微妙但有效的构象的影响α在携带N-C重氮酯σ键α烷氧基甲基侧链,具有出色的位点和化学选择性。通常,发现金属催化的反应有利于在吲哚C(2)-C(3)双键上的金属碳氢化合物加成-C-H,从而得到环丙烷化产物(四环γ-内酰胺)。然而,化学选择性还受空间效应,如在显示Ñ - [2-(3- methylindolyl)]甲基重氮酯,以及由该催化剂所采用的性质在一定程度上,如在该N-C α-烷氧基甲基重氮酰胺。发现四环γ-内酰胺在金属碳烯化合物反应条件下或在酸性条