Heterocyclic compounds with bridgehead nitrogen atoms. Part 9. Synthesis in the pyrrolo[2,1,5-de]quinolizine ([2.3.3]cyclazine) series starting from indolizines
作者:James W. Dick、William K. Gibson、Derek Leaver、John E. Roff
DOI:10.1039/p19810003150
日期:——
Pyrrolo[2,1,5-de]quinolizines may be obtained from various 3-substituted derivatives of 5-methyl-2-phenyl- and 2,5-dimethyl-indolizine by base-catalysed condensation of the 5-methyl group with a carbonyl group in the β-position of the 3-substituent. The 1,3-diethoxalyl derivatives of these indolizines were converted, by treatment with sodium ethoxide or methoxide, into mixtures of pyrrolo[2,1,5-cd]indolizines
吡咯并[2,1,5- de ]喹啉嗪可通过5-甲基与α-甲基的碱催化缩合从5-甲基-2-苯基-和2,5-二甲基-吲哚嗪的各种3-取代的衍生物获得。 3位取代基的β位置上的羰基。通过用乙醇钠或甲醇钠处理,将这些吲哚嗪的1,3-二乙二醛基衍生物转化为吡咯并[2,1,5- cd ]吲哚并嗪([2.2.3] cyclazines)和4-羟基-3 H的混合物。-pyrrolo [2,1,5- de ] quinolizin -3-ones。在相似的条件下,5-甲基-2-苯基-3-丙酮酰基-吲哚嗪会产生低产率的4-甲基-2-苯基-3 H-吡咯并[2,1,5- de] quinolizin-3-one。当3-取代基是2-氧代丙烷-或2-氧代-2-苯基乙基-羟基肟基时,用叔丁醇钾在二甲基亚砜中进行环化反应,得到的3-羟基亚氨基-3 H-吡咯并[2,1 ,5-德]喹嗪类通过用银(处理干净地转化成相应的pyr