Synthesis of N-Acyl Pyrroles and Isoindoles from Oxime Ester Precursors via Transition-Metal-Catalyzed Iminocarboxylation
作者:Daesung Lee、Siyuan Su
DOI:10.1055/s-0042-1751377
日期:——
3-enyne and an ortho-alkynylarene moiety, followed by a spontaneous O→N acyl migration of the enol carboxylate intermediate to generate N-acyl pyrroles and isoindoles. The reaction scope for pyrrole synthesis is general, whereas the formation of isoindoles has a relatively narrow scope because of their instability.
Molecular iodine mediated cyclization reactions of 2-(1-alkynyl)benzylic alcohols to substituted indenones
作者:Chengyu Wang、Jingyu Yang、Xingcan Cheng、Ende Li、Yanzhong Li
DOI:10.1016/j.tetlet.2012.06.030
日期:2012.8
efficient I-2-mediated approach to the synthesis of disubstituted indenones from readily available 2-alkynylbenzyl alcohols in the presence of H2O has been developed. These results are different from the known iodocyclization reactions in which O-containing heterocycles are obtained. (c) 2012 Elsevier Ltd. All rights reserved.
Studies into diastereoselective Dötz benzannulations for the synthesis of axially chiral biaryls
作者:James C Anderson、John W Cran、N.Paul King
DOI:10.1016/j.tetlet.2003.08.096
日期:2003.10
A series of racemic chiral ortho substituents on 1-phenythex-1-yne have been found to control the atroposelective formation of a biaryl from Dotz benzannulation with pentacarbonyl(methoxyphenylmethylene)chromium(0). The results show there is a subtle balance between the chiral ortho substituent controlling atroposelectivity with a dr 3-5:1 and allowing benzannulation to proceed in yields of 44-67%. (C) 2003 Elsevier Ltd. All rights reserved.
Borylative Heterocyclization without Air-Free Techniques
作者:Chao Gao、Shuichi Nakao、Suzanne A. Blum
DOI:10.1021/acs.joc.0c01096
日期:2020.8.21
In contrast to previously reported borylative heterocyclization methods, a reaction here proceeds without air-free techniques to access synthetically useful borylated thiophenes, benzothiophenes, and isocoumarins. A comparison of stability/decomposition rates in air of several catecholboronic ester (Bcat) compounds derived from different heterocycle cores showed a strong dependence on the heterocycle
An Oxyboration Route to a Single Regioisomer of Borylated Dihydrofurans and Isochromenes
作者:Kim N. Tu、Chao Gao、Suzanne A. Blum
DOI:10.1021/acs.joc.8b01790
日期:2018.9.21
An oxyboration reaction that employs B–O σ bonds as addition partners to C–C π bonds to form borylated dihydrofurans and isochromenes has been developed. By nature of the mechanism, the reaction produces exclusively one borylated regioisomer, in contrast to and/or complementary to alternative routes that produce these borylated heterocycles via C–H activation. Access to the borylative heterocyclization