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(Thio)urea-catalyzed Friedel-Crafts Reaction: Synthesis of Bis(indolyl)- methanes

[ Vol. 16 , Issue. 12 ]

Author(s):

Juan Antonio Rivas-Loaiza, Carlos Ernesto Reyes-Escobedo, Yliana Lopez, Susana Rojas-Lima, Juan Pablo García-Merinos* and Heraclio López-Ruiz*   Pages 959 - 968 ( 10 )

Abstract:


Bis(indolyl)methane derivatives (BIMs) were synthesized in moderate to good yields by (thio)urea catalyzed electrophilic substitution of indole (2) with various aldehydes 1. Reactions were performed under conventional and microwave (MW) heating, either using 1,2-dichloroetane as solvent or without solvent. The procedure using microwave heating was also applied to the synthesis of the natural products vibrindole A (3n), arsindoline A (3i), arundine (3o) and tris(1H-indol-3-yl)methane (3j). Additionally, the synthesis of streptindole was carried out via intermediate 3g. This methodology is well suited for the synthesis of bis(indolyl)methanes: it offers good yields of products, low sensitivity to moisture and oxygen, high tolerance to different functional groups on the aldehydes such as alkynes and trimethylsilane, and simplicity in operation

Keywords:

(Thio)urea, Bis(indolyl)methane, Microwave reaction, Solvent free conditions, Catalysts, Indole, Vibrindole A.

Affiliation:

Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, 58030 Morelia, Michoacán, Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Carretera-Pachuca-Tulancingo Km 4.5, Ciudad Universitaria, 42184 Mineral de la Reforma, Hidalgo, Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, 58030 Morelia, Michoacán, Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Carretera-Pachuca-Tulancingo Km 4.5, Ciudad Universitaria, 42184 Mineral de la Reforma, Hidalgo, Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, 58030 Morelia, Michoacán, Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Carretera-Pachuca-Tulancingo Km 4.5, Ciudad Universitaria, 42184 Mineral de la Reforma, Hidalgo



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