Studies on the synthesis of heterocyclic compounds. Part 832. A simple and efficient synthesis of apomitomycin derivatives; a potential intermediate for mitomycin synthesis
作者:Tetsuji Kametani、Yoshio Kigawa、Hideo Nemoto、Masataka Ihara、Keiichiro Fukumoto
DOI:10.1039/p19800001607
日期:——
also synthesised in good yields from reaction of the corresponding phenylacetates (15), (12), and (13) with trans-3-acetoxy-4-(N-ethoxycarbonyl-N-methylamino)pyrrolidine-2-thione (20). Treatment of compounds (25)–(31) with sodium hydride and copper(I) bromide in dimethylformamide afforded methyl 2,3-dihydro-6,7-dimethoxy-1H-pyrrolo[1,2-a]indole-9-carboxylate (34) and the methyl (±)-trans-1-acetoxy-2-
吡咯烷-2-硫酮(21)与α-溴-(2-溴-4,5-二甲氧基苯基)乙酸甲酯缩合(15),得到甲基(Z)-α-(2-溴-4,5-二甲氧基苯基) -α-吡咯烷基-2-亚基乙酸酯(25),高收率。还合成了其他几种(Z)-α-芳基-α-[3-乙酰氧基-4-(N-乙氧基羰基-N-甲基氨基)吡咯烷-2-亚基]乙酸酯(26)-(31)使相应的苯乙酸酯(15),(12)和(13)与反式-3-乙酰氧基-4-(N-乙氧基羰基-N-甲基氨基)吡咯烷-2-硫酮(20)反应。用氢化钠和铜处理化合物(25)-(31)(I)在二甲基甲酰胺中的溴化物得到2,3,2-二氢-6,7-二甲氧基-1 H-吡咯并[1,2- a ]吲哚-9-羧酸盐(34)和(±)-反式-1-乙酰氧基-甲基2-(N-乙氧基羰基-N-甲基氨基)-2,3-二氢-1 H-吡咯并[1,2- a ]吲哚-9-羧酸盐(35)-(37)收率高。甲基(±)-反式-1