Five-Membered 2,3-Dioxo Heterocycles: L. Synthesis and Thermolysis of 3-Aroyl- and 3-Hetaroyl-5-phenyl-1,2,4,5-tetrahydropyrrolo[1,2-a]quinoxalin-1,2,4-triones
作者:K. S. Bozdyreva、I. V. Smirnova、A. N. Maslivets
DOI:10.1007/s11178-005-0296-6
日期:2005.7
(Z)-3-Phenacylidene- and (Z)-3-hetaroylmethylidene-1-phenyl-1,2,3,4-tetrahydroquinoxalin-2-ones react with oxalyl chloride to give 3-acyl-5-phenyl-1,2,4,5-tetrahydropyrrolo[1,2-a]quinoxaline-1,2,4-triones. Thermolysis of the latter generates acyl(3-oxo-4-phenyl-3,4-dihydroquinoxalin-2-yl)ketenes which are stabilized via [4 + 2]-cyclodimerization followed by [1,3]-acylotropic shift to afford 4-acyl-3-acyloxy-2-(3-oxo-4-phenyl-3,4-dihydroquinoxalin-2-yl)-6-phenyl-5,6-dihydro-1H-pyrido[1,2-a]quinoxaline-1,5-diones.
(Z)-3-苯乙烯基和(Z)-3-杂芳基甲烯基-1-苯基-1,2,3,4-四氢喹喔啉-2-酮与草酰氯反应产生3-酰基-5-苯基-1,2,4,5-四氢吡咯[1,2-a]喹喔啉-1,2,4-三酮。后者的热解产生酰基(3-氧基-4-苯基-3,4-二氢喹喔啉-2-基)酮烯,这些产物通过[4 + 2]环二聚反应稳定,随后发生[1,3]酰基迁移,得到4-酰基-3-酰氧基-2-(3-氧基-4-苯基-3,4-二氢喹喔啉-2-基)-6-苯基-5,6-二氢-1H-吡啶[1,2-a]喹喔啉-1,5-二酮。