Tandem Oxidation-Dehydrogenation of (Hetero)Arylated Primary Alcohols via Perruthenate Catalysis
作者:Christian J. Bettencourt、Sharon Chow、Peter W. Moore、Christopher D. G. Read、Yanxiao Jiao、Jan Peter Bakker、Sheng Zhao、Paul V. Bernhardt、Craig M. Williams
DOI:10.1071/ch21137
日期:——
Tandem oxidative-dehydrogenation of primary alcohols to give α,β-unsaturated aldehydes in one pot are rare transformations in organic synthesis, with only two methods currently available. Reported herein is a novel method using the bench-stable salt methyltriphenylphosphonium perruthenate (MTP3), and a new co-oxidant NEMO·PF6 (NEMO = N-ethyl-N-hydroxymorpholinium) which provides unsaturated aldehydes
伯醇的串联氧化脱氢在一锅中得到 α,β-不饱和醛是有机合成中罕见的转化,目前只有两种方法可用。本文报道了一种使用长期稳定的过钌酸甲基三苯基鏻盐 (MTP3) 和新的助氧化剂 NEMO·PF 6 (NEMO = N-乙基-N-羟基吗啉) 的新方法,该方法以低到中等的收率提供不饱和醛。使用N-氧化物助氧化剂 NMO (NMO = N-甲基吗啉N-氧化物)/NEMO对(杂)芳基化伯醇进行 Ley-Griffith 氧化,通过添加N-氧化物盐 NEMO·PF 6得到扩展将中间体饱和醛转化为其不饱和对应物。重点介绍了该方法的发现、方法开发、反应范围和相关挑战。通过合成与辅助结合蛋白 B 相关的多烯支架,证明了天然产物合成后期脱氢的概念价值。