Studies in the synthesis of camptothecin. An efficient synthesis of 2,3-dihydro-1H-pyrrolo[3,4-b]quinoline
作者:L. H. Zalkow、J. B. Nabors、K. French、S. C. Bisarya
DOI:10.1039/j39710003551
日期:——
An efficient regioselective synthesis of 2,3-dihydro-1H-pyrrolo[3,4-b]quinoline (3), a key intermediate in the synthesis of camptothecin, has been developed. The synthesis, which has been extended to a number of analogues, involves an acid-catalysed Friedländer condensation in the absence of a solvent. Base-catalysed condensation was shown to lead predominantly to the isomeric 2,3-dihydro-1H-pyrrolo[3
已经开发出有效的区域选择性合成2,3-二氢-1 H-吡咯并[3,4- b ]喹啉(3)的喜树碱合成的关键中间体。该合成已扩展为许多类似物,涉及在不存在溶剂的情况下酸催化的弗里德兰德缩合反应。已显示,碱催化的缩合主要导致异构体2,3-二氢-1 H-吡咯并[3,2- b ]喹啉(10)。讨论了由N-乙酰基-3-吡咯烷酮和3-氧吡咯烷-1-甲酸乙酯作为合成化合物(3)和(10)的中间体得到的烯醇和烯醇化物的相对稳定性。