Chiral Acylsilanes in Organic Synthesis. Part 2. The role of the solvent, the organometallic reagent, and the nature of the substrate for the diastereoselectivity of 1,2-additions to racemic alkoxymethyl-substituted acylsilanes
作者:Alexander Chapeaurouge、Stefan Bienz
DOI:10.1002/hlca.19930760507
日期:1993.8.11
The role of the solvent, the organometallic reagent, and the nature of the substrate for the diastereoselectivity of 1,2-additions to racemic alkoxymethyl-substituted acylsilanes was investigated with the acylsilanes 1a–d by variation of the reaction parameters. The results obtained in this study support strongly the previously proposed preferred ‘chelate-controlled’ reaction path followed under several
通过改变反应参数,与酰基硅烷1a-d一起研究了溶剂,有机金属试剂的作用以及底物的性质,即1,2-加成与外消旋烷氧基甲基取代的酰基硅烷的非对映选择性。在这项研究中获得的结果有力地支持了先前提出的在几种反应条件下优选的“螯合物控制”的反应路径:在提供最少溶剂的情况下,与最佳螯合底物与路易斯酸酸性最大的有机金属试剂反应可获得最高的立体选择性。结果表明,使用最佳反应条件可以得到几乎完全的立体选择性。