Organolanthanide-catalyzed hydroamination. A kinetic, mechanistic, and diastereoselectivity study of the cyclization of N-unprotected amino olefins
作者:Michel R. Gagne、Charlotte L. Stern、Tobin J. Marks
DOI:10.1021/ja00027a036
日期:1992.1
regiospecific Cpsup prime}}sub 2}LnR (Cpsup prime}} = eta}sup 5}-Mesub 5}Csub 5};R = H, CH(TMS)sub 2}, eta}sup 3}-Csub 3}Hsub 5}, N(TMS)sub 2}; Ln-La,Nd,Sm,Y,Lu)-catalyzed hydroamination/cyclization of the amino olefins Hsub 2}NCHRsup 1}Rsup 2}CH=CHsub 2} to yield heterocycles. Kinetic isotope effects are observed for some of the cyclizations. The complexes were synthesized to model
该贡献报告了高效的区域特异性 Cpsup prime}}sub 2}LnR (Cpsup prime}} = eta}sup 5}-Mesub 5}Csub 5};R = H , CH(TMS)sub 2}, eta}sup 3}-Csub 3}Hsub 5}, N(TMS)sub 2}; Ln-La,Nd,Sm,Y,Lu) -氨基烯烃Hsub 2}NCHRsup 1}Rsup 2}CH=CHsub 2}的催化加氢胺化/环化以产生杂环。对于一些环化,观察到了动力学同位素效应。合成复合物以模拟催化循环中的物种。每个晶胞结晶两个独立的分子,平均 La-NHCHsub 3} 和 Lale}NHsub 2}CHsub 3} 键距分别为 2.31 (1) 和 2.70 (1) 埃}。胺-酰胺配合物在一些胺和酰胺配体之间进行快速的分子内质子转移。与游离胺的分子间交换在