Chemodivergent Couplings of N-Arylureas and Methyleneoxetanones via Rh(III)-Catalyzed and Solvent-Controlled C–H Activation
摘要:
The efficient couplings of diverse N-arylureas and methyleneoxetanones have been realized via Rh(III)-catalyzed and solvent-controlled chemoselective C-H functionalization, which involved the tunable beta-H elimination and beta-O elimination processes, thereby giving divergent access to quinolin-2(1H)-ones and ortho-allylated N-arylureas with broad substrate compatibility and good functional group tolerance. the divergent synthetic utilities of the transformations have also been exemplified by subsequently tandem C-H allylation, unsymmetrical C-H functionalization, alternative reaction mode, as well as removal of the carbamoyl group.
Lossen Rearrangement vs C–N Reductive Elimination Enabled by Rh(III)-Catalyzed C–H Activation/Selective Lactone Ring-Opening: Chemodivergent Synthesis of Quinolinones and Dihydroisoquinolinones
作者:Mengyao Bian、Hamdulla Mawjuda、Hui Gao、Huiying Xu、Zhi Zhou、Wei Yi
DOI:10.1021/acs.orglett.0c03734
日期:2020.12.18
An unprecedented Rh(III)-catalyzed cascade C–H activation/Lossen rearrangement of aromatic amides with methyleneoxetanones has been realized along with a tunable C–N bond reductive elimination/trans esterification, giving divergent access to quinolinones and dihydroisoquinolinones via selective ring-opening of the four-membered lactone unit. Combined computational and experimental mechanistic studies
Synthesis of benzoazepine derivatives <i>via</i> Rh(<scp>iii</scp>)-catalyzed inert C(sp<sup>2</sup>)–H functionalization and [4 + 3] annulation
作者:Yuanshuang Xu、Linghua Zhang、Mengyang Liu、Xiaopeng Zhang、Xinying Zhang、Xuesen Fan
DOI:10.1039/c9ob01830a
日期:——
In this paper, a novel and sustainable synthesis of the hitherto unreported 5H-benzo[c]imidazo[1,2-a]azepine-6-carboxylic acids via the cascade reactions of 2-arylimidazoles (1) with methylene-oxetanones (2) is presented. Mechanistically, the formation of the title compounds is triggered by a Rh(iii)-catalyzed C(sp2)-H alkenylation of 1 with 2 followed by an intramolecular N-nucleophilic substitution
Access to Substituted Propenoic Acids via Rh(III)-Catalyzed C–H Allylation of (Hetero)Arenes with Methyleneoxetanones
作者:Jintao Xia、Lingheng Kong、Xukai Zhou、Guangfan Zheng、Xingwei Li
DOI:10.1021/acs.orglett.7b02983
日期:2017.11.3
efficient synthesis of disubstituted acrylic acids has been realized via Rh(III)-catalyzed C–H activation of (hetero)arenes and coupling with four-membered methyleneoxetanones under redox-neutral conditions. In most cases, the reactions are silver-free, and the products are exclusively E-selective with a broad substrate scope. The transformation proceeds via ortho C–H activation followed by selective
Rhodium(<scp>iii</scp>)-catalyzed chemoselective C–H functionalization of benzamides with methyleneoxetanones controlled by the solvent
作者:Mengyao Bian、Kuangshun Ma、Hamdulla Mawjuda、Xiyong Yu、Xingwei Li、Hui Gao、Zhi Zhou、Wei Yi
DOI:10.1039/c9ob00645a
日期:——
Described herein is a Rh(iii)-catalyzed and solvent-controlled double C-H functionalization of common benzamides via selective acyl C-O cleavage (β-H elimination) or alkyl C-O cleavage (β-O elimination) of the methyleneoxetanone substrate, which provides a straightforward way for the divergent synthesis of chain alkylated benzamides and seven-membered 1H-benzo[c]azepine-1,3(2H)-diones in a highly chemoselective