Synthesis and thermolysis of the 2,3-dihydro-1<i>H</i>-pyrole-2,3-diones, pseudopericyclic reactions of formyl(<i>N</i>-phenylimidoyl)ketene: Experimental data and PM3 calculations
作者:Emin Saripinar、Süleyman Karataş
DOI:10.1002/jhet.5570420507
日期:2005.7
The reactions of the 2,3-dihydro-1H-furan-2,3-dione 1 with Schiff bases 2a-f at 60–70°C furnish the corresponding 2,3-dihydro-1H-pyrole-2,3-diones 3a-f. The heating of 3a-d afforded the corresponding 4-methoxybenzoyl(N-arylimidoyl)k:etenes 4a-d as intermediates which undergo a very facile cyclization to quinoline-4-ones 5a-d. According to our PM3 calculations, fragmentation of 4-formyl-2,3-dihydro-1H-pyrole-2
2,3-二氢-1 H-呋喃-2,3-二酮1与席夫碱2a-f在60-70°C的反应提供了相应的2,3-二氢-1 H-吡咯-2,3二酮3a-f。加热3a-d得到相应的4-甲氧基苯甲酰基(N-芳基酰亚胺基)k:etenes 4a-d作为中间体,其非常容易地环化为喹啉-4-酮5a-d。根据我们的PM3计算,4-甲酰基-2,3-二氢-1 H-吡咯-2,3-二酮的裂解和甲酰基(N-苯基亚氨基)k:戊烯IN1的1,4-环化反应是azetin-2-一IN2和OXe-tone IN3是具有两个轨道连接的伪周环反应,通过平面过渡结构进行。由于亚胺苯基可能具有顺式和反式构象,因此IN1有八个E / Z异构体。此外,我们还通过PM3方法计算了生成喹啉-4-酮的反应机理。