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
Rhodium(III)-Catalyzed C(sp<sup>2</sup>)–H Chemoselective Annulation to O-Cyclized Isochromen-imines from Benzamides
作者:Ping Zhang、Wenju Chang、Yan-Shang Kang、Wenxuan Zhao、Pei-Pei Cui、Yong Liang、Wei-Yin Sun、Yi Lu
DOI:10.1021/acs.orglett.0c03425
日期:2020.12.18
selective annulation of benzamides with internal alkynes has been achieved to the formation of O-cyclized isochromen-imines. Various substituents are well-tolerated under mild reaction conditions. Density functional theory calculations indicate that silver carbonate could act as a Lewis acid to assist the ligand to improve the chemical selectivity of the reaction in a catalyticsystem.
A Microwave-Assisted Domino Rearrangement of Propargyl Vinyl Ethers to Multifunctionalized Aromatic Platforms
作者:David Tejedor、Gabriela Méndez-Abt、Leandro Cotos、Miguel A. Ramirez、Fernando García-Tellado
DOI:10.1002/chem.201003532
日期:2011.3.14
H makes a difference! A novel reactivity profile of propargyl vinyl ethers has been developed, which is controlled by the presence of a hydrogen atom at the homopropargylic position (see scheme; EWG=electron‐withdrawing group). This strategy was conveniently used to construct multifunctionalized phenolic platforms, including salicylaldehydes and the corresponding ketone derivatives.
Stereoselective Synthesis of (Z)-Allyl Alcohols through Coinage-Metal-Catalyzed Nucleophilic Addition of Benzo[d]isoxazoles with Unactivated Propargyl Alcohols
作者:Zhiyuan Chen、Wenjin Wu、Tiantian Zheng、Jie Tan、Shouzhi Pu
DOI:10.1055/s-0037-1611828
日期:2019.7
The Au/Ag-cocatalyzed stereoselective addition reaction of cyanophenol anion species generated in situ with unactivated propargyl alcohols to produce functionalized (Z)-allylalcohols in mostly good yields is reported. Benzo[d]isoxazoles were found to be excellent building blocks for the production of highly reactive cyanophenol anions from Kemp elimination reactions, thus serving as a masked benzonitrile