Nitrogen heterocycles. Part 10. Rearrangement of N-methylisoindolo[1,2-b][3]benzazepinium to N-methyldibenzo[a,g]quinolizinium (N-methylberbinium) ions, and a convenient new route to some alkaloid analogues of the isoquinoline series
作者:Pier Luigi Barili、Rita Fiaschi、Elio Napolitano、Luisa Pistelli、Valerio Scartoni、Antonio Marsili
DOI:10.1039/p19810001654
日期:——
cyclised by polyphosphoric acid to 13,13a-dihydro-10,11-dimethoxyisoindolo[1,2-b][3]benzazepine-5,8(7H)-dione (3). The ethylene acetal of (3)[(4)] gives, on reduction with lithium aluminium hydride followed by treatment with methyl iodide, 7,8,13,13a-tetrahydro-10,11-dimethoxy-6-methyl-8-oxo-5H-isoindolo[1,2-b][3]benzazepinium iodide ethylene acetal (6). This compound, by the action of alkali, is converted
3-(3,4-二甲氧基亚苄基)邻苯二甲酸酯通过与甘氨酸反应得到(E)-和(Z)-3-(3,4-二甲氧基亚苄基)邻苯二甲酰亚胺-2-基乙酸的混合物(1)氢化得到3-(3,4-二甲氧基苄基)邻苯二甲酰亚胺-2-基乙酸(2)。该化合物通过多磷酸环化成13,13a-二氢-10,11-二甲氧基异吲哚并[1,2- b ] [3]苯并ze庚因-5,8 (7 H)-二酮(3)。(3)[(4)]的乙缩醛经氢化铝锂还原后,用碘代甲烷处理,得到7,8,13,13a-四氢-10,11-二甲氧基-6-甲基-8-氧代。 -5 H-异吲哚并[1,2- b] [3]碘化苯并ze庚啶乙缩醛(6)。该化合物在碱的作用下转化为(Z)-5,6-二氢-10,11-二甲氧基-6-甲基二苯并[ c,g ]-azecin-8(7 H)-一个乙烯的混合物乙缩醛(7)和5,6,13,13a-四氢-2,3-二甲氧基-7-甲基-5-氧代-8 H-二苯并-[