Synthesis and Autoxidation of New Tetracyclic 9<i>H</i>,10<i>H</i>-Indolizino[1,2-<i>b</i>]indole-1-ones
作者:Gautam Bhattacharya、Tsann-Long Su、Chih-Ming Chia、Kuo-Tung Chen
DOI:10.1021/jo001020m
日期:2001.1.1
synthesized by modified Fischer indole synthesis from the enol ether of 2,5-dihydroxy-7-methyl-6-cyano-indolizine (3) and arylhydrazines (4a-g). Attempted N-methylation of 7a-d produced a series of autoxidized products including 10-hydroperoxy-1-methoxyindolizino[1,2-b]indole (9a-d) as the major product accompanied with methylperoxides (10a-d and 11a-d) and 2-formyl-3-(pyridine-2-yl)indole (12a, 12c) derivatives
新的四环9H,10H-吲哚并[1,2-b]吲哚-1-酮衍生物(7a-d,7ea,7eb)是通过由2,5-二羟基-7的烯醇醚进行的费希尔吲哚改性合成的-甲基-6-氰基-吲哚嗪(3)和芳基肼(4a-g)。尝试7a-d的N-甲基化会产生一系列自氧化产物,其中以10-氢过氧-1-甲氧基吲哚并[1,2-b]吲哚(9a-d)为主要产物,并伴随有过氧化甲基(10a-d和11a-d)。 )和2-甲酰基-3-(吡啶-2-基)吲哚(12a,12c)衍生物作为次要产物。基于某些中间体的分离,推测出自氧化的合理机制。认为该反应在新型的自氧化之后通过氮杂酸酯/烯胺中间体进行。