Reaction of singlet oxygen with enolic tautomers of 1-aryl-2-methyl 1,3-diketones
作者:Michikazu Yoshioka、Kyoko Hashimoto、Tetsuo Fukuhara、Tadashi Hasegawa
DOI:10.1039/a705448c
日期:——
6′-trialkylphenyl)-2-methyl 1,3-diketones 6 exist in the enol form in solution, and on reaction with singlet oxygen in acetonitrile give products arising from hydrogen abstraction from both the enolic hydroxy and the 2-methyl groups by the singlet oxygen; namely, the 2-hydroperoxy 1,3-diketones 7, the 2-methylene 1,3-diketones 8 and the epoxy ketones 9. The 2-hydroperoxy 1,3-diketones 7 readily undergo deoxygenation
1-(2',4',6'-三烷基苯基)-2-甲基1,3-二酮6以烯醇形式存在于溶液中,与乙腈中的单线态氧反应后,由两个烯醇式羟基和2-甲基被单线态氧所取代;即2-氢过氧1,3-二酮7、2-亚甲基1,3-二酮8和环氧酮9。2-氢过氧1,3-二酮7易于被三苯基膦脱氧而得到2-羟基。 1,3-二酮12.在6在甲醇或乙醇中的反应中,最初形成的二烯8与溶剂反应生成相应的迈克尔加合物10和11。