Formation of Pyrido(3,2-f)quinoxalines by Reaction of 6-Amino-2,3-dimethylquinoxaline with Aldehydes.
作者:Suguru KONDO、Tatsushi SHIOZAWA、Yoshiyasu TERAO
DOI:10.1248/cpb.45.722
日期:——
The reaction of 6-amino-2, 3-dimethylquinoxaline (1) with acetaldehyde in ethanol proceeded at refluxing temperature to give 10-ethoxy-2, 3, 8-trimethyl-7, 8, 9, 10-tetrahydropyrido[3, 2-f]quinoxaline (2), which was converted to 2, 3, 8-trimethylpyrido[3, 2-f]quinoxaline (4) and 2, 3, 8-trimethyl-7, 8, 9, 10-tetrahydropyrido[3, 2-f]quinoxaline (5) in an acidic medium. Crotonaldehyde also reacted smoothly at room temperature with 1 to afford several pyrido[3, 2-f]quinoxaline derivatives along with 4 and 5.
6-氨基-2,3-二甲基喹喔啉(1)与乙醇中的乙醛在回流温度下反应,生成10-乙氧基-2,3,8-三甲基-7,8,9,10-四氢吡啶并[3,2-f]喹喔啉(2),后者在酸性介质中转化为2,3,8-三甲基吡啶并[3,2-f]喹喔啉(4)和2,3,8-三甲基-7,8,9,10-四氢吡啶并[3,2-f]喹喔啉(5)。巴豆醛在室温下与1顺利反应,生成几种吡啶并[3,2-f]喹喔啉衍生物以及4和5。