Phosphine‐Free Manganese(II)‐Catalyst Enables Acceptorless Dehydrogenative Coupling of Alcohols with Indoles
作者:Vinita Yadav、Ekambaram Balaraman、Santosh B. Mhaske
DOI:10.1002/adsc.202100621
日期:2021.9.21
molecularly defined NNN−Mn(II) pincer complex catalyzed acceptorless dehydrogenative coupling of alcohols with indoles is reported. A wide variety of symmetrical and unsymmetrical bis(indolyl)methane derivatives as well as some structurally important products such as Vibrindole A, Turbomycin B alkaloid, Antileukemic, and Anticancer agents were synthesized. Mechanistic studies illustrate the importance
本文报道了一种空气稳定的、分子定义的 NNN-Mn(II) 钳形复合物催化醇与吲哚的无受体脱氢偶联。合成了多种对称和非对称双(吲哚基)甲烷衍生物以及一些结构上重要的产品,如 Vibrindole A、Turbomycin B 生物碱、抗白血病和抗癌剂。机理研究说明了 NH 部分在配合物中的重要性以及金属-配体合作在催化过程中的关键作用。
Ruthenium Pincer Complex Catalyzed Selective Synthesis of C‐3 Alkylated Indoles and Bisindolylmethanes Directly from Indoles and Alcohols
作者:Nandita Biswas、Rahul Sharma、Dipankar Srimani
DOI:10.1002/adsc.202000326
日期:2020.7.29
catalyst for C‐3 alkylation of 1H‐indoles with various aliphatic primary and secondary alcohols including cyclic alcohols as well as benzylic alcohols. The selective synthesis of bisindolylmethane derivatives is also achieved from the same set of indole and alcohol just by altering the reaction parameters. Furthermore, the sustainable synthesis of C‐3 alkylated indoles directly from 2‐(2‐nitrophenyl)ethan‐1‐ol
Photoacid-Catalyzed Friedel–Crafts Arylation of Carbonyls
作者:Zena M. Salem、Jason Saway、Joseph J. Badillo
DOI:10.1021/acs.orglett.9b02841
日期:2019.11.1
In this report, we demonstrate that visible-light-induced thiourea photoacids catalyze C–C bond-forming reactions. Upon photoirradiation, Schreiner’s thiourea [(N,N′-bis[3,5-bis(trifluoromethyl)phenyl]-thiourea] catalyzes the double Friedel–Crafts addition of indoles to aldehydes and isatins to form the corresponding triarylmethanes and 3,3′-diarylindolin-2-ones. This protocol is amenable to a wide
Herein, we demonstrated Mn-catalyzed selective C-3 functionalization of indoles with alcohols. The developed catalyst can also furnish bis(indolyl)methanes from the same set of substrates under slightly modified reaction conditions. Mechanistic studies reveal that the C-3 functionalization of indoles is going via a borrowing hydrogen pathway. To highlight the practical utility, a diverse range of substrates