Regioselective Dihalohydration Reactions of Propargylic Alcohols: Gold-Catalyzed and Noncatalyzed Reactions
作者:Jarryl M. D'Oyley、Abil E. Aliev、Tom D. Sheppard
DOI:10.1002/anie.201405348
日期:2014.9.26
The regioselective conversion of propargylicalcohols into previously unreported α,α‐diiodo‐β‐hydroxyketones was achieved by treatment with N‐iodosuccinimide in the presence of a gold catalyst. The corresponding α,α‐dichloro‐β‐hydroxyketones were obtained by treatment with trichloroisocyanuric acid in the absence of a catalyst. The latter reaction can be extended to other alkynols. These transformations
Dihalohydration of Alkynols: A Versatile Approach to Diverse Halogenated Molecules
作者:Samantha M. Gibson、Jarryl M. D'Oyley、Joe I. Higham、Kate Sanders、Victor Laserna、Abil E. Aliev、Tom D. Sheppard
DOI:10.1002/ejoc.201800668
日期:2018.8.7
reactions of propargylic alcohols can be used to access a wide variety of useful halogenated building blocks. A novel procedure for dibromohydration of alkynes has been developed, and a selection of dichloro and dibromo diols and cyclic ethers were synthesized. The dihalohydration of homo‐propargylic alcohols provides a usefulroute to 3‐halofurans, which were shown to readily undergo cycloaddition reactions
Contemporaneous Dual Catalysis: Chemoselective Cross-Coupling of Catalytic Vanadium–Allenoate and π-Allylpalladium Intermediates
作者:Barry M. Trost、Xinjun Luan、Yan Miller
DOI:10.1021/ja204817y
日期:2011.8.17
This paper presents a detailed investigation of a dual catalytic system that combines a vanadium-catalyzed Meyer-Schuster rearrangement and a palladium-catalyzedallylicalkylation. The implementation of this novel reaction relies on matching the formation rates of vanadium-allenoate and π-allylpalladium intermediates with their bimolecular coupling rate in order to minimize the undesired protonation
A silver/DBU catalyst system was developed for the effective synthesis of cyclic carbonate and oxazolidinone from the reaction of CO2 with propargylicalcohols and propargylic amines, respectively,...
under a CO2 atmosphere, various tertiary and secondary propargyl alcohols were efficiently converted into the corresponding α,β-unsaturated carbonyl compounds in high yield. An isotopic experiment using C18O2 revealed that carbon dioxide mediated the rearrangement via an intramolecular nucleophilic attack on the alkyne activated by the silver catalyst.
在 CO2 气氛下,在催化量的银盐与 DBU 的存在下,各种炔丙醇叔醇和仲炔醇有效地转化为相应的 α,β-不饱和羰基化合物,收率很高。使用 C18O2 的同位素实验表明,二氧化碳通过对银催化剂活化的炔烃的分子内亲核攻击来介导重排。