Ni-Catalyzed Reductive Antiarylative Cyclization of Alkynones
作者:Zhijun Zhou、Wenfeng Liu、Wangqing Kong
DOI:10.1021/acs.orglett.0c02534
日期:2020.9.4
A new catalyst system for the antiarylative cyclization of alkynones and aryl halides through a reductive cross-coupling strategy is developed. The transformation proceeds smoothly in the absence of organometallicreagents and features high functional group tolerance. This method provides an effective platform to access a wide variety of synthetically useful endocyclic tetrasubstituted allylic alcohols
Enantioselective Nickel-Catalyzed <i>anti</i>-Carbometallative Cyclizations of Alkynyl Electrophiles Enabled by Reversible Alkenylnickel <i>E</i>/<i>Z</i> Isomerization
作者:Christopher Clarke、Celia A. Incerti-Pradillos、Hon Wai Lam
DOI:10.1021/jacs.6b04206
日期:2016.7.6
Nickel-catalyzedadditions of arylboronic acids to alkynes, followed by enantioselective cyclizations of the alkenylnickel species onto tethered ketones or enones, are reported. These reactions are reliant upon the formal anti-carbonickelation of the alkyne, which is postulated to occur by the reversible E/Z isomerization of an alkenylnickel species.
Iridium‐Catalyzed Arylative Cyclization of Alkynones by 1,4‐Iridium Migration
作者:Benjamin M. Partridge、Jorge Solana González、Hon Wai Lam
DOI:10.1002/anie.201403271
日期:2014.6.16
1,4‐Metal migrations enable the remote functionalization of CH bonds, and have been utilized in a wide variety of valuable synthetic methods. The vast majority of existing examples involve the 1,4‐migration of palladium or rhodium. Herein, the stereoselective synthesis of complex polycycles by the iridium‐catalyzed arylative cyclization of alkynones with arylboronic acids is described. To our knowledge
Stereoselective synthesis of pentasubstituted 1,3-dienes <i>via</i> Ni-catalyzed reductive coupling of unsymmetrical internal alkynes
作者:Zhijun Zhou、Jiachang Chen、Herong Chen、Wangqing Kong
DOI:10.1039/d0sc04173d
日期:——
The reductive coupling of alkynes represents a powerful strategy for the rapid synthesis of highly substituted 1,3-dienes. This method has the advantages of high atom and step economy, and readily available substrates. Unfortunately, the intermolecular coupling of unsymmetrical internal alkynes remains extremely challenging due to the difficulty in controlling self-dimerization and cross-coupling,
Allylic alcohol synthesis by Ni-catalyzed direct and selective coupling of alkynes and methanol
作者:Herong Chen、Zhijun Zhou、Wangqing Kong
DOI:10.1039/d1sc02625a
日期:——
nickel-catalyzed direct coupling of alkynes and methanol, providing direct access to valuable allylicalcohols in good yields and excellent chemo- and regioselectivity. The approach features a broad substrate scope and high atom-, step- and redox-economy. Moreover, this method was successfully extended to the synthesis of [5,6]-bicyclic hemiacetals through a cascade cyclization reaction of alkynones and methanol