A new approach to the synthesis of benzofuro[3,2-<i>b</i>]quinolines, benzothieno[3,2-<i>b</i>]quinolines and indolo[3,2-<i>b</i>]quinolines
作者:Stanislav Rádl、Petr Konvička、Petr Váchal
DOI:10.1002/jhet.5570370430
日期:2000.7
Compounds 7a, 7b, and 3 were converted to their chloro derivatives 14a-c, which were reduced with hydrogen and a catalyst to the corresponding compounds 8a, 8b, and 2. The presented pathway represents a new method of preparation of quindoline 2 and its O and S analogs 8. Chloro derivatives 14 are reactive enough to provide the corresponding methoxy derivatives 15 and dimethylamino derivatives 16. Methylation
在碱性条件下用2-氟-或2-硝基苯并溴化物13处理2-羟基-,2-巯基和2-乙氧基羰基氨基-苯甲腈12分别提供了相应的苯并呋喃,苯并噻吩和吲哚中间体10。这些化合物的亲核环化产生相应的四环喹啉酮7a,7b和3。发现化合物10(R = NO 2)的脱氮环化反应特别有用。将化合物7a,7b和3转化为其氯衍生物14a-c,经氢气和催化剂还原为相应的化合物8a,8b和2。所示途径代表了一种制备喹啉2及其O和S类似物8的新方法。氯衍生物14具有足够的反应性,可以提供相应的化合物。还研究了甲氧基衍生物15和二甲基氨基衍生物16。用碘甲烷将化合物7a和7b甲基化,得到主要的N-甲基衍生物17和次要的O-甲基衍生物15的混合物。