Multiple Roles of the Pyrimidyl Group in the Rhodium‐Catalyzed Regioselective Synthesis and Functionalization of Indole‐3‐carboxylic Acid Esters
作者:Hui Jiang、Shang Gao、Jinyi Xu、Xiaoming Wu、Aijun Lin、Hequan Yao
DOI:10.1002/adsc.201500769
日期:2016.1.21
A regioselective synthesis of indole‐3‐carboxylic acid esters from anilines and diazo compounds has been realized by making use of the pyrimidyl group‐assisted rhodium‐catalyzed CH activation and CNbond formation. The reaction proceeds under mild conditions, exhibits good functional group tolerance and scalability. Reutilization of the pyrimidyl directing group in the resulting products provided
Ruthenium(II)-Catalyzed <i>Ortho</i>-C–H Alkylation of Naphthylamines with Diazo Compounds for Synthesis of 2,2-Disubstituted π-Extended 3-Oxindoles in Water
Ruthenium(II)-catalyzed ortho-C–H alkylation of naphthylamines with diazocompounds for the synthesis of 2,2-disubstituted π-extended 3-oxindoles has been developed. The method represents the first example of C–H alkylation via carbenoid insertion in water as a sustainable solvent. The procedure includes an inexpensive ruthenium catalyst as well as aqueous media and results in the release of benign
Controllable Rh(III)-Catalyzed Annulation between Salicylaldehydes and Diazo Compounds: Divergent Synthesis of Chromones and Benzofurans
作者:Peng Sun、Shang Gao、Chi Yang、Songjin Guo、Aijun Lin、Hequan Yao
DOI:10.1021/acs.orglett.6b03355
日期:2016.12.16
A Rh(III)-catalyzed annulation between salicylaldehydes and diazocompounds with controllable chemoselectivity is described. AgNTf2 favored benzofurans via a tandem C–H activation/decarbonylation/annulation process, while AcOH led to chromones through a C–H activation/annulation pathway. The reaction exhibited good functional group tolerance and scalability. Moreover, only a single regioisomer of benzofuran
Rh(III)-Catalyzed Redox-Neutral Annulation of Primary Benzamides with Diazo Compounds: Approach to Isoquinolinones
作者:Youzhi Wu、Peng Sun、Kaifan Zhang、Tie Yang、Hequan Yao、Aijun Lin
DOI:10.1021/acs.joc.5b02824
日期:2016.3.4
Reported herein is a Rh-catalyzed redox-neutralannulation of primary benzamides with diazo compounds, representing an efficient and economic protocol to isoquinolinones. The procedure exhibited good functional group tolerability, scalability, and regioselectivity, obviating the need for oxidants, and only environmentally benign N2 and H2O were released. Further utilization of the method provided an
Rh(<scp>iii</scp>)-Catalyzed dual C–H functionalization of 3-(1<i>H</i>-indol-3-yl)-3-oxopropanenitriles with sulfoxonium ylides or diazo compounds toward polysubstituted carbazoles
A rhodium-catalyzed annulation of 3-(1H-indol-3-yl)-3-oxopropanenitriles with sulfoxonium ylides or diazo compounds has been developed, leading to a series of polysubstituted carbazoles in moderate to good yields. This procedure proceeded with formal Rh(III)-catalyzed (4 + 2) cycloaddition, with the functionalization of 2-C–H bonds of indole in a step-economical procedure. Additionally, this reaction