Organic Reactions Catalyzed by Methylrhenium Trioxide: Reactions of Ethyl Diazoacetate and Organic Azides
作者:Zuolin Zhu、James H. Espenson
DOI:10.1021/ja954039t
日期:1996.1.1
para position of phenols favors the formation of α-phenoxy ethyl acetates. The use of EDA to form α-thio ethyl acetates and N-substituted glycine ethyl esters, on the other hand, is hardly affected by the size or structure of the parent thiol or amine, with all of these reactions proceeding in high yield. MTO-catalyzed cycloaddition reactions occur between EDA and aromatic imines, olefins, and carbonyl
[EN] MYOGLOBIN-BASED CATALYSTS FOR CARBENE TRANSFER REACTIONS<br/>[FR] CATALYSEURS À BASE DE MYOGLOBINE POUR RÉACTIONS DE TRANSFERT DE CARBÈNE
申请人:UNIV ROCHESTER
公开号:WO2016086015A1
公开(公告)日:2016-06-02
Methods are provided for carrying out carbene transfer transformations such as olefin cyclopropanation reactions, carbene heteroatom-H insertion reactions (heteroatom = N, S, Si), sigmatropic rearrangement reactions, and aldehyde olefination reactions with high efficiency and selectivity by using a novel class of myoglobin-based biocatalysts. These methods are useful for the synthesis of a variety of organic compounds which contain one or more new carbon-carbon or carbon-heteroatom (N, S, or Si) bond. The methods can be applied for conducting these transformations in vitro (i.e., using the biocatalyst in isolated form) and in vivo (i.e., using the biocatalyst in a whole cell system).
Re(I) tricarbonyl bipyridine and terpyridine complexes catalyse stereospecific cyclopropanation of alkenes; high selectivity of cyclopropane vs coupling and an ee of 73% and 62% for cis- and trans-cyclopropanes of styrene respectively were achieved with the [Re(L)(CO)(3)(MeCN)]OTf complex (L = chiral C(2)-symmetric terpyridine ligand).
Cyclopropanation catalyzed by osmium porphyrin complexes
作者:Daniel A. Smith、David N. Reynolds、L. Keith Woo
DOI:10.1021/ja00059a059
日期:1993.3
report herein the use of osmiumporphyrins as stereoselective cyclopropanation catalysts using ethyl diazoacetate with a variety of alkenes. In addition, their studies show that an isolable carbene complex ((TTP)Os[double bond]CHCO[sub 2]Et) is capable of catalytically and stoichiometrically cyclopropanating styrene. Several significant aspects have evolved from the use of osmium meso-tetra-p-tolyporphyrin
The first examples of heterogeneous Fe-catalysed cyclopropanation reactions are presented. Pyrolysis of in situ-generated iron/phenanthroline complexes in the presence of a carbonaceous material leads to specific supported nanosized iron particles, which are effective catalysts for carbene transfer reactions. Using olefins as substrates, cyclopropanes are obtained in high yields and moderate diastereoselectivities
介绍了非均相 Fe 催化的环丙烷化反应的第一个例子。在含碳材料的存在下原位生成的铁/菲咯啉配合物的热解产生特定的负载纳米铁颗粒,这是卡宾转移反应的有效催化剂。使用烯烃作为底物,以高产率和中等非对映选择性获得环丙烷。所开发的协议是可扩展的,并且在温和条件下使用氧化再活化协议可以有效地恢复失活后回收催化剂的活性。