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
Lewis Acid Mediated “<i>endo-dig</i>” Hydroalkoxylation–Reduction on Internal Alkynols for the Stereoselective Synthesis of Cyclic Ethers and 1,4-Oxazepanes
作者:Santosh J. Gharpure、Dharmendra S. Vishwakarma、Santosh K. Nanda
DOI:10.1021/acs.orglett.7b03241
日期:2017.12.15
Lewisacidmediated 5/6/7-endo-dig hydroalkoxylation–reduction cascade on internal alkynols gave an expedient, stereoselective synthesis of cyclic ethers and 1,4-oxazepanes. The strategy has been extended to the first examples of hydroalkoxylation–alkyne Prins-type cyclization cascade of alkyne-tethered alkynols, giving access to oxa-bicyclic scaffolds. This method was used as the key step in the stereoselective
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