Rhodium-Catalyzed Room Temperature C–C Activation of Cyclopropanol for One-Step Access to Diverse 1,6-Diketones
摘要:
A rhodium-catalyzed room temperature C-C activation of cyclopropanol has been demonstrated for the single-step synthesis of a range of electronically and sterically distinct 1,6-diketones. This reaction proceeds efficiently in shorter reaction time following a highly atom-economical pathway. To illustrate the synthetic potential of 1,6-diketones, aldol and macrocyclization reactions have been successfully demonstrated. Preliminary mechanistic studies revealed the involvement of nonradical pathways.
4-HO-TEMPO-Catalyzed Redox Annulation of Cyclopropanols with Oxime Acetates toward Pyridine Derivatives
作者:Jun-Long Zhan、Meng-Wei Wu、Dian Wei、Bang-Yi Wei、Yu Jiang、Wei Yu、Bing Han
DOI:10.1021/acscatal.9b00832
日期:2019.5.3
for the synthesis of pyridines through the annulation of cyclopropanols and oxime acetates has been developed. This protocol features good functional group tolerance and high chemoselectivity and also promises to be efficient for the late-stage functionalization of skeletons of drugs and natural products. Mechanism studies indicate that the reaction involves the in situ generated α,β-unsaturated ketones
Silver-Promoted Oxidative Ring Opening/Alkynylation of Cyclopropanols: Facile Synthesis of 4-Yn-1-ones
作者:Ye-Xiang Xie、Jin-Heng Li、Cheng-Yong Wang、Ren-Jie Song
DOI:10.1055/s-0035-1560374
日期:——
silver-promoted oxidative ringopening/alkynylation of cyclopropanols with ethynylbenziodoxolones (EBX) is described. This method enables the formation of alkylated alkynes via a sequence of ringopening and alkynylation. Control experiments support a radical mechanism in this silver-promoted method. A new silver-promoted oxidative ringopening/alkynylation of cyclopropanols with ethynylbenziodoxolones
Rhodium-Catalyzed C2-Alkylation of Indoles with Cyclopropanols Using <i>N</i>,<i>N</i>-Dialkylcarbamoyl as a Traceless Directing Group
作者:Kuppan Ramachandran、Pazhamalai Anbarasan
DOI:10.1021/acs.orglett.2c02527
日期:2022.9.23
An efficient rhodium-catalyzed synthesis of C2-alkylated NH-free indoles has been achieved from substituted indoles and cyclopropanols. The reaction allows the synthesis of various C2-alkylated products in good to excellent yield. Important features of the method include the use of a N,N-dialkylcarbamoyl group as a traceless directing group, C–H/C–C bond functionalization, good functional group tolerance
已经从取代的吲哚和环丙醇实现了有效的铑催化合成 C2-烷基化的无 NH 吲哚。该反应允许以良好至优异的产率合成各种 C2 烷基化产物。该方法的重要特点包括使用N,N-二烷基氨基甲酰基作为无痕导向基团,C-H/C-C键官能化,良好的官能团耐受性,适用范围广,可合成吡咯并[1,2- a ]吲哚,并鉴定潜在的中间体。
Rh(<scp>iii</scp>)-catalyzed [4 + 1] cyclization of aryl substituted pyrazoles with cyclopropanols <i>via</i> C–H activation
作者:Wenxi Chen、Yan Mao、Min Wang、Fei Ling、Changchang Li、Zhangpei Chen、Jinzhong Yao
DOI:10.1039/d2ob02001g
日期:——
rhodium-catalyzed formal [4 + 1]-cyclization reaction of aryl substituted pyrazoles with cyclopropanols via C–H bond activation/cyclization processes to selectively construct a series of carbonyl functionalized pyrazolo[5,1-a]isoindoles is described. The reaction features good functional group compatibility and a broad substrate scope with respect to both cyclization components with up to 84% yields. Mechanistic studies