Facile access to 6-substituted 1,4,5,7-tetrahydropyrrolo[3,4-<i>b</i>]-pyridines<i>via</i>hantzsch type dimethyl 4-aryl-2-formyl-6-methyl-1,4-dihydropyridine-3,5-dicarboxylates
作者:Milostav Chudík、Štefan Marchalín、Peter Knesl、Adam Daich、Bernard Decroix
DOI:10.1002/jhet.5570370623
日期:2000.11
7-tetrahydropyrrolo[3,4-b]pyridines (7a-f) is described according to a Hantzsch type reaction from formyl-ester 4 by imination, borohydride reduction and intramolecular thermal amino-ester cyclization. The starting compound 4 was prepared in three steps from the readily available formyl derivative 1, methyl 4,4-dimethoxy-3-oxobutanoate and methyl 3-aminocrotonate.
根据由甲酸酯4制备的Hantzsch型反应,描述了6-取代的4-芳基-5-氧代-1,4,5,7-四氢吡咯并[3,4- b ]吡啶(7a-f)的有效组装。胺化,硼氢化物还原和分子内热氨基酯环化。分三步从容易获得的甲酰基衍生物1、4,4-二甲氧基-3-氧代丁酸甲酯和3-氨基巴豆酸甲酯制备起始化合物4。