Thebaine Adducts with Maleimides. Synthesis and Transformations
作者:E.E. Shults、M.M. Shakirov、G.A. Tolstikov、V.N. Kalinin、G. Schmidhammer
DOI:10.1007/s11178-005-0306-8
日期:2005.8
Diels-Alder reaction of thebaine with maleimides is structurally specific and yields [7,8,3′,4′ ]-succinimido-endo-ethenotetrahydrothebaines containing N′-alkyl, cycloalkyl, aralkyl or aryl substituents. N′-[1(S)-hydroxymethyl-2-methylpropyl]-succinimido-6,14-endo-ethenotetrahydrothebaine formed in reaction of S-valinol with (7α,8α)-anhydrido-6,14-endo-ethenotetrahydrothebaine. The reduction of the adducts by LiAlH4 afforded N′-substituted 7,8-pyrrolidino-endo-ethenotetrahydrothebaines. The reduction of fused succinimides by NaBH4 resulted in the corresponding 2′α-hydroxylactam derivatives. O-Demethylation of the tetrahydrothebaine pyrrolidine derivatives effected by BBr3 afforded compounds of the tetrahydrooripavine series. The O-demethylation of tetrahydrothebaine succinimide derivatives gave rise to the corresponding 6-demethyl-endo-ethenotetrahydrooripavines. Alkylation conditions were found for N′-(4-hydroxyphenethyl)-substituted tetrahydrothebaine succinimide derivatives.
霹雳-阿尔德反应中,神仙草碱与马来酰亚胺反应具有结构特异性,生成含有N′-烷基、环烷基、芳基或者芳香烷基取代基的[7,8,3′,4′]-琥珀酰亚胺-内-乙烯四氢神仙草碱。在S-巴醇与(7α,8α)-无水-内-乙烯四氢神仙草碱反应中,形成了N′-[1(S)-羟甲基-2-甲基丙基]-琥珀酰亚胺-6,14-内-乙烯四氢神仙草碱。利用LiAlH4还原加成物得到N′-取代的7,8-吡咯烷基-内-乙烯四氢神仙草碱。用NaBH4还原融合琥珀酰亚胺得到了相应的2′α-羟基内酰胺衍生物。用BBr3对四氢神仙草碱吡咯烷衍生物进行O-去甲基化,得到四氢奥利帕韦系列化合物。四氢神仙草碱有关的琥珀酰亚胺衍生物的O-去甲基化生成对应的6-去甲基-内-乙烯四氢奥利帕韦。对N′-(4-羟基苯乙基)取代的四氢神仙草碱琥珀酰亚胺衍生物进行了烷基化条件的研究。