Three-Component Tandem Reaction Involving Acid Chlorides, Terminal Alkynes, and 2-Aminoindole Hydrochlorides: Synthesis of α-Carboline Derivatives in Aqueous Conditions via Regioselective [3 + 3] Cyclocondensation
摘要:
An efficient synthesis toward highly diversified a-carboline derivatives via a three-component tandem reaction using acid chlorides, terminal allcynes, and 2-aminoindole hydrochlorides has been described. The salient feature of the one-pot strategy involves regioselective [3 + 3]-cyclocondensation and the presence of water in the reaction medium to facilitate cyclizafion. Nonaqueous conditions furnished products in poor yields.
Diversity-Oriented Synthesis of Polycyclic Indoles: Brønsted or Lewis Acid Catalyzed Three-Component Reaction for the Synthesis of α-Carbolines and Pyrimidoindoles
作者:Rajesh K. Arigela、Ravi Kumar、Srinivas Samala、Sahaj Gupta、Bijoy Kundu
DOI:10.1002/ejoc.201402633
日期:2014.9
diversity-oriented synthesis of pyrido- and pyrimido-indoles from an acid-catalyzed three component (3C) reaction involving ethyl 2-amino-1H-indole-3-carboxylates, arylaldehydes, and terminal alkynes. In the presence of a Bronsted acid such as trifluoroacetic acid (TFA), the 3C reaction furnished a mixture of pyrido- and pyrimido-indoles, whereas when catalyzed by Yb(OTf)3 as a Lewis acid, pyrimidoindoles