A Useful Methodology for the Synthesis of 2-Methyl-4-nitrobenzimidazoles
作者:Wei Tian、Spiros Grivas
DOI:10.1055/s-1992-26359
日期:——
Cyclocondensation of 3-nitro-1,2-benzenediamines 2 with 2,4-pentanedione provides a convenient route for the preparation of 2-methyl-4-nitrobenzimidazoles 3. A discrepancy in the literature regarding the 5-chloro-, 5-methoxy- and 5-methyl derivatives of the title compounds is discussed.