Enantioselective hydrogen transfer reactions from chiral binaphthyl variants of tin hydrides to prochiral radicals
作者:Michael Blumenstein、Matthias Lemmler、Ahlke Hayen、Jürgen O. Metzger
DOI:10.1016/j.tetasy.2003.07.018
日期:2003.10
Enantioselective, reagent-controlled radical reductions of prochiral alkyl radicals, mediated by binaphthyl variants of tin hydrides can be carried out in a highly selective fashion: a maximum selectivity of 68% e.e. was reached. Temperature, solvent, Lewis acid and substituent effects are selectivity-controlling elements. The reactions can be conducted catalytically with 1 mol% of chiral information
由氢化锡的双萘基变体介导的前手性烷基的对映选择性,试剂控制的自由基还原可以高度选择性的方式进行:达到了68%ee的最大选择性。温度,溶剂,路易斯酸和取代基效应是选择性控制的因素。该反应可以在1mol%的手性信息和过量的NaCNBH 3的催化下进行。