作者:G. Kresze、H. Saitner、J. Firl、W. Kosbahn
DOI:10.1016/s0040-4020(01)98226-2
日期:1971.1
2-Phenyl-3-aryl-6-methoxycarbonyl-3,6-dihydro-1,2-oxazines (1) and, generally in lower yields, 2-phenyl-6-aryl-3-methoxycarbonyl-dihydro-oxazines (2) are formed by reaction of nitrosobenzene with 1-methoxycarbonyl-4-arylbutadienes. Chromatography on basic alumina yields substituted pyrroles 3 from 1, and substituted α-pyrones 4 from 2. A general reaction scheme explains the complicated influence of
2-苯基-3-芳基-6-甲氧基羰基-3,6-二氢-1,2-恶嗪(1),通常以较低的收率获得2-苯基-6-芳基-3-甲氧基羰基-二氢恶嗪(2))是通过亚硝基苯与1-甲氧基羰基-4-芳基丁二烯反应形成的。在碱性氧化铝上进行色谱分离,从1生成取代的吡咯3,从2生成取代的α-吡喃酮4。通用的反应方案解释了取代基对异构体比率和速率的复杂影响。具有负取代基的异构体2的形成类似于“逆”二烯合成。