Tungsten-Catalyzed Regioselective and Stereospecific Ring Opening of 2,3-Epoxy Alcohols and 2,3-Epoxy Sulfonamides
摘要:
The first catalytic, highly C3-selective, stereosepecific ring-opening reaction of 2,3-epoxy alcohols and 2,3-epoxy sulfonamides has been accomplished. This process was efficiently promoted by W-salts, and the developed method was applicable to various epoxides with diverse N- and O-nucleophiles affording the products in good to excellent yields (up to 95%) and generally with high regioselectivities (C3:C2 up to >99:1).
Tungsten-Catalyzed Regio- and Enantioselective Aminolysis of<i>trans</i>-2,3-Epoxy Alcohols: An Entry to Virtually Enantiopure Amino Alcohols
作者:Chuan Wang、Hisashi Yamamoto
DOI:10.1002/anie.201408732
日期:2014.12.8
The first catalytic enantioselectiveaminolysis of trans‐2,3‐epoxy alcohols has been accomplished. This stereospecific ring‐opening process was efficiently promoted by a tungsten/bis(hydroxamic acid) catalytic system, furnishing various anti‐3‐amino‐1,2‐diols with excellent regiocontrol and high enantioselectivities (up to 95 % ee). Moreover, virtually enantiopure 3‐amino‐1,2‐diols could be obtained
A simple and mild procedure has been developed for the first time for the C-3selective ring-opening of aromatic 2,3-epoxy alcohols/epoxides with aromatic amines catalysed by (3-cyclodextrin in water at room temperature to afford the corresponding β-aminoalcohols in excellent yields with high regioselectivity.
Magnesium chloride (MgCl2) catalyzed highly regioselective C-3 ring opening of 2,3 epoxy alcohols by N-nucleophile
作者:Amit Kumar、Gautam Panda
DOI:10.1016/j.tetlet.2021.153013
日期:2021.4
herein report Magnesiumchloride (MgCl2) catalyzed first highly C3-selective ring-opening reaction of various 2,3-epoxy alcohols with assorted N-Nucleophiles and sodium azide to furnish 3-amino-1,2 diols and 3-azido-1,2 diols respectively in high yields under mild reactionconditions. This protocol attributes the use of catalytic amount of Magnesiumchloride (MgCl2), simple reactionconditions, practical
Yttrium-Catalyzed Regioselective Aminolysis of 2,3-Epoxy Esters and Amides
作者:Chuan Wang、Hongqing Yao
DOI:10.1055/a-2077-5084
日期:2023.12
Herein, an yttrium-catalyzed regioselective ring-opening reaction of 2,3-epoxy esters and amides with amines as nucleophiles is presented. This method features high regiocontrol, an enantiospecific SN2 reaction pathway, a broad substrate scope, and mild reaction conditions, furnishing a wide range of α-hydroxy β-amino esters and amides in regioisomerically pure forms. Notably, the selective nucleophilic
在此,介绍了一种钇催化的 2,3-环氧酯和酰胺与胺作为亲核试剂的区域选择性开环反应。该方法具有高区域控制、对映特异性 S N 2 反应途径、广泛的底物范围和温和的反应条件,可提供范围广泛的区域异构纯形式的 α-羟基 β-氨基酯和酰胺。值得注意的是,对 C-3 位的选择性亲核攻击受底物羰基的定向作用控制。
Almirante; Gennari, Annali di Chimica, 1952, vol. 42, p. 645,649