作者:Pattama Saisaha、Dirk Pijper、Ruben P. van Summeren、Rob Hoen、Christian Smit、Johannes W. de Boer、Ronald Hage、Paul L. Alsters、Ben L. Feringa、Wesley R. Browne
DOI:10.1039/c0ob00102c
日期:——
A practical method for the multigram scale selective cis-dihydroxylation of electron deficient alkenes such as diethyl fumarate and N-alkyl and N-aryl-maleimides using H2O2 is described. High turnovers (>1000) can be achieved with this efficient manganese based catalyst system, prepared in situ from a manganese salt, pyridine-2-carboxylic acid, a ketone and a base, under ambient conditions. Under optimized conditions, for diethyl fumarate at least 1000 turnovers could be achieved with only 1.5 equiv. of H2O2 with d/l-diethyl tartrate (cis-diol product) as the sole product. For electron rich alkenes, such as cis-cyclooctene, this catalyst provides for efficient epoxidation.
本文描述了一种实用方法,利用H2O2实现对多克规模电子缺失型烯烃(如富马酸二乙酯和N-烷基及N-芳基马来酰亚胺)的选择性顺式二羟基化。在该高效的锰基催化体系中,可在常温常压下,以高转化率(超过1000次)实现反应。该催化剂体系由锰盐、吡啶-2-羧酸、酮和碱在原位制备而成。在优化的条件下,富马酸二乙酯至少可实现1000次转化,仅使用1.5当量的H2O2,产物为唯一的(顺-二醇)d/l-酒石酸二乙酯。对于电子丰富的烯烃,如顺式-环辛烯,该催化剂可提供高效的环氧化作用。