Synthesis, characterization, and microwave-promoted catalytic activity of novel benzimidazole salts bearing silicon-containing substituents in Heck-Mizoroki and Suzuki-Miyaura cross-coupling reactions under aerobic conditions

Authors

HASAN KÜÇÜKBAY
NİHAT ŞİRECİ
ÜLKÜ YILMAZ
SELMA DENİZ
MEHMET AKKURT
ZELİHA BAKTIR
ORHAN BÜYÜKGÜNGÖR

DOI

10.3906/kim-1109-5

Abstract

A number of benzimidazole derivatives (1-8) were synthesized and the catalytic activity of these compounds in a catalytic system including Pd(OAc)_2 and K_2CO_3 in DMF-H_2O was evaluated in Heck-Mizoroki and Suzuki-Miyaura cross-coupling reactions of aryl iodides, bromides, and chlorides with styrene and arylboronic acids under microwave irradiation and aerobic conditions. The yields of both the Heck-Mizoroki and the Suzuki-Miyaura cross coupling reactions with aryl iodides and aryl bromides were nearly quantitative. The synthesized 1-substituted benzimidazole (1) and benzimidazole salts (2-8) were identified by ^1H- and ^{13}C-NMR and IR spectroscopic methods, and micro analysis. The molecular structure of 7 was also determined by X-ray crystallography.

Keywords

Benzimidazole salt, N-heterocyclic carbene, palladium catalysis, Heck-Mizoroki coupling reaction, Suzuki-Miyaura coupling reaction, microwave, crystal structure analysis

First Page

201

Last Page

217

Recommended Citation

KÜÇÜKBAY, HASAN; ŞİRECİ, NİHAT; YILMAZ, ÜLKÜ; DENİZ, SELMA; AKKURT, MEHMET; BAKTIR, ZELİHA; and BÜYÜKGÜNGÖR, ORHAN (2012) "Synthesis, characterization, and microwave-promoted catalytic activity of novel benzimidazole salts bearing silicon-containing substituents in Heck-Mizoroki and Suzuki-Miyaura cross-coupling reactions under aerobic conditions," Turkish Journal of Chemistry: Vol. 36: No. 2, Article 1. https://doi.org/10.3906/kim-1109-5
Available at: https://journals.tubitak.gov.tr/chem/vol36/iss2/1