Expansion of Substrate Scope for Nitroxyl Radical/Copper-Catalyzed Aerobic Oxidation of Primary Alcohols: A Guideline for Catalyst Selection
作者:Yusuke Sasano、Aoto Yamaichi、Ryota Sasaki、Shota Nagasawa、Yoshiharu Iwabuchi
DOI:10.1248/cpb.c21-00043
日期:2021.5.1
acceptors. The optimum conditions identified herein were successful in the oxidation of various types of primary alcohols, including unprotected amino alcohols and divalent-sulfur-containing alcohols in good-to-high yields. Moreover, N-protected alaninol, an inefficient substrate in the nitroxyl radical/copper-catalyzed aerobic oxidation, was oxidized in good yield. On the basis of the optimization results
已经确定了四种独特的最佳硝酰基自由基/铜盐/添加剂催化剂组合,以适应各种类型的伯醇有氧氧化为它们相应的醛的需要。有趣的是,较少的亲核催化剂对特定的伯烯丙基和炔丙基醇的氧化表现出较高的催化活性,以产生充当迈克尔能受体的α,β-不饱和醛。本文确定的最佳条件成功地以高至高收率氧化了各种类型的伯醇,包括未保护的氨基醇和含二价硫的醇。而且,N保护的丙氨醇是硝基氧基自由基/铜催化的需氧氧化中效率低下的底物,可以得到良好的氧化。根据最优化结果,已经建立了催化剂选择指南。 全尺寸图片