Ligand effects in the rhodium(II) catalysed reactions of diazoamides and diazoimides
作者:Soyfur Miah、Alexandra M.Z. Slawin、Christopher J. Moody、Scott M. Sheehan、Joseph P. Marino、Mark A. Semones、Albert Padwa、Ian C. Richards
DOI:10.1016/0040-4020(95)01070-x
日期:1996.2
ligands, fluorinated carboxamides strongly promoting attack on aromatic rings in preference to other processes. Decomposition of the diazoimides resulted in intramolecular attack on the carbonyl group to give an ylide which could be trapped inter- or intramolecularly. X-Ray crystal structures are reported for the diazo compounds 2 and 4, the indoles 17 and 25, the β-lactam 20, the cycloheptapyrrolones 24
由相应的胺或酰胺制备了一系列取代的α-重氮酰胺1-8和重氮酰亚胺9-12。铑(II)催化的重氮酰胺分解导致对芳环的进攻,从而产生羟吲哚或对烷基的进攻,从而产生β-内酰胺或环庚吡咯烷酮。铑类胡萝卜素中间体的化学选择性取决于金属配体,氟化羧酰胺优先于其他过程而强烈促进对芳环的攻击。重氮酰亚胺的分解导致分子内对羰基的攻击,从而产生可被分子间或分子内捕获的叶立德。据报道重氮化合物2和X的X射线晶体结构如图4所示,吲哚17和25,β-内酰胺20,环庚基吡咯烷酮24和28,二聚体29和Pictet Spengler产物39。