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.
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
Ru(II)-Catalyzed Tunable Cascade Reaction <i>via</i> C–H/C–C Bond Cleavage
作者:Zi Yang、Qi Yue、Mengqi Yang、Hong Zhang、Xiuling Cui
DOI:10.1021/acs.joc.0c01614
日期:2020.10.16
A facile synthesis of various 3-(alkoxyalkyl)-1H-indoles from pyrazolidinones, 2-acetylenic ketones, and alkyl alcohols via C–H/C–C bond activation has been developed. The reaction proceeds smoothly under the proper reaction conditions, and preliminary mechanistic studies suggest that NaOAc is crucial for C–C bond activation. The advantages of the present method represent a redox-neutral process and
Catalytic enantioselective arylative cyclizations of alkynyl 1,3-diketones by 1,4-rhodium(<scp>i</scp>) migration
作者:Alistair Groves、Jinwei Sun、Hal R. I. Parke、Michael Callingham、Stephen P. Argent、Laurence J. Taylor、Hon Wai Lam
DOI:10.1039/c9sc06309a
日期:——
The enantioselective synthesis of densely functionalized polycarbocycles by the rhodium(i)-catalyzed reaction of arylboronic acids with alkynyl 1,3-diketones is described. The key step in these reactions is an alkenyl-to-aryl 1,4-Rh(i) migration..