Utilization of protopine and related alkaloids. XI. Photolysis of 7,8-dimethoxy-2-methyl-3-(4',5'-methylenedioxy-2'-vinylphenyl)isocarbostyril and its application to the preparation of oxychelerythrines.
Utilization of protopine and related alkaloids. XI. Photolysis of 7,8-dimethoxy-2-methyl-3-(4',5'-methylenedioxy-2'-vinylphenyl)isocarbostyril and its application to the preparation of oxychelerythrines.
作者:MASAYUKI ONDA、HIROKO YAMAGUCHI
DOI:10.1248/cpb.27.2076
日期:——
Photolysis of the isocarbostyril (5) gives predominantly the regioisomeric dimers (7) and (8). Attempts to trap the initial photo-product (14) with dienophiles are made and the formation mechanisms of the resulting products are discussed. The 4b, 12-epoxyimino compound (18) resulted from trapping with nitrosobenzene is smoothly converted into oxychelerythrines.
Intermolecular benzyne cycloaddition (IBC), a versatile approach to benzophenanthridine antitumor alkaloids. Formal synthesis of nitidine and chelerythrine
作者:Gloria Martin、Enrique Guitian、Luis Castedo、Jose M. Saa
DOI:10.1021/jo00048a024
日期:1992.10
A new approach to the synthesis of benzophenanthridine alkaloids is described which is based on cycloaddition of arynes to pyrrolinediones, the pyrrolinediones behaving as aza diene equivalents. The synthesis of 2,3,8,9-substituted benzophenanthridines and the regioselective synthesis of a 2,3,7,8-substituted benzophenanthridine were performed. The formal synthesis of chelerythrine and the antitumor alkaloid nitidine is described.
Ninomiya,I. et al., Heterocycles, 1977, vol. 7, p. 137 - 141
作者:Ninomiya,I. et al.
DOI:——
日期:——
Ninomiya, Ichiya; Yamamoto, Okiko; Naito, Takeaki, Journal of the Chemical Society. Perkin transactions I, 1983, p. 2171 - 2174