Studies on the syntheses of heterocyclic compounds. Part 875. The total stereoselective retro mass spectral synthesis of (±)-emetine
作者:Tetsuji Kametani、Samuel A. Surgenor、Keiichiro Fukumoto
DOI:10.1039/p19810000920
日期:——
Addition of 3,4-dihydro-6,7-dimethoxy-1-methylisoquinoline (5) to 3-methoxycarbonyl-1,6,7,11b-tetrahydro-9,10-dimethoxybenzo[a]quinolizin-4-one (4) produced 2-[3,4-dihydro-6,7-dimethoxy-1-isoquinolyl)methyl]-3-methoxycarbonyl-1,2,3,6,7,11b-hexahydro-9,10-dimethoxybenzo[a]quinolizin-4-one (6A). The same reaction of 3,4-dihydro-1-methyl-9H-pyrido[3,4-b]indole (15) with (4) afforded 2-(3,4-dihydro-9H-pyrido[3
将3,4-二氢-6,7-二甲氧基-1-甲基异喹啉(5)加至3-甲氧基羰基-1,6,7,11b-四氢-9,10-二甲氧基苯并[ a ]喹诺嗪-4-酮(4 )制得的2- [3,4-二氢-6,7-二甲氧基-1-异喹啉基)甲基] -3-甲氧基羰基-1,2,3,6,7,11b-六氢-9,10-二甲氧基苯并[ a ]喹诺酮-4-酮(6A)。3,4-二氢-1-甲基-9 H-吡啶[3,4- b ]吲哚(15)与(4)的相同反应得到2-(3,4-二氢-9 H-吡啶基[3, 4 - b ] -1-吲哚基)甲基] -1,2,3,6,7,11b-六氢-9,10-二甲氧基-3-甲氧基羰基苯并[ a ]喹啉嗪-4-酮(16)。前迈克尔加合物(6A)经六步转化为(±)-依替丁(1)。