Ketone Synthesis by Direct, Orthogonal Chemoselective Hydroacylation of Alkenes with Amides: Use of Alkenes as Surrogates of Alkyl Carbanions
作者:Hui Geng、Pei‐Qiang Huang
DOI:10.1002/cjoc.201900252
日期:2019.8
and direct transformation of carboxamides are two exciting areas that have attracted considerable attention in recent years. We report herein that secondaryamides, the least reactive derivatives of carbonyl compounds, upon activated with triflic anhydride, can serve as effective hydroacylating reagents in partner with alkenes to yield ketones at ambient temperature. The method was applied to the one‐step
Although α‐alkylation of ketones with primary alcohols by transition‐metal catalysis is well‐known, the same process with secondaryalcohols is arduous and complicated by self‐condensation. Herein a well‐defined, high‐valence cobalt(III)‐catalyst was applied for successful α‐alkylation of ketones with secondaryalcohols. A wide‐variety of secondaryalcohols, which include cyclic, acyclic, symmetrical
Synthesis of Chiral β,β-Disubstituted Ketones via CuH-Catalyzed Coupling of Aryl Alkenes and 3-Aryl-2<i>H</i>-azirines
作者:Fang Xie、Shijie Dong、Yajun Sun、Wenxing Liu、Xiaodan Liu、Lu Liu、Qin Zhao、Jiangli Wang
DOI:10.1021/acs.orglett.2c03311
日期:2022.11.11
A CuH-catalyzed coupling of arylalkenes with 3-aryl-2H-azirines has been developed to synthesize optically active β,β-disubstituted ketones. We propose that this protocol occurs through a sequence in which a chiral alkylcopper complex regioselectively attacks the N–C2 bonds of azirines to generate chiral β-aryl imines, which additionally afford ketones upon hydrolysis. This method provides a novel
Aryl boronic acid-controlled divergent ring-contraction and ring-opening/isomerization reaction of <i>tert</i>-cyclobutanols enabled by nickel catalysis
In this work, we wish to present a nickel-catalyzed divergent ring-contraction and ring-opening/isomerization reaction of tert-cyclobutanols. The key to control these two different reaction pathways is to choose appropriate boronic acid, where the use of phenylboronic acid and pyrimidin-5-ylboronic acid enables a ring-contraction and ring-opening reaction/isomerization, respectively. Both cyclopropyl