New conditions for synthesis of (±)-2-monosubstituted and (±)-2,2-disubstituted 2,3-dihydro-4(1H)-quinazolinones from 2-nitro- and 2-aminobenzamide
作者:Richard A. Bunce、Baskar Nammalwar
DOI:10.1002/jhet.672
日期:2011.9
An efficient synthesis of (±)‐2‐monosubstituted and (±)‐2,2‐disubstituted 2,3‐dihydro‐4(1H)‐quinazolinones has been developed using a dissolving metalreduction‐condensative cyclization strategy. Treatment of 2‐nitrobenzamide and an aldehyde or ketone with iron powder in refluxing acetic acid affords high yields of the title compounds. More complex ring systems are available by incorporating additional