Substituted ethyl 2-acyl-3-amino-6-methylthieno[2,3-<i>b</i>]pyridine-4-carboxylates as synthons for novel heterocycles
作者:Frank T. Coppo、Maged M. Fawzi
DOI:10.1002/jhet.5570340304
日期:1997.5
The triethylamine-catalyzed reaction of 4-substituted ethyl 2-acyl-3-amino-6-methylthieno[2,3-b]pyridine-4-carboxylates IIIa-h with 2,2,6-trimethyl-4H-1,3-dioxin-4-one IV gave 4-substituted ethyl 3-acetyl-2-hydroxy-7-methylthieno[2,3-b:4,5-b′]dipyridine-9-carboxylates Va-h. Some of the thienodipyridines (V) reacted with excess IV to give 5-substituted ethyl 3-acetyl-4,8-dimethyl-2-oxo-2H-pyrano[2,3-b]-pyrido[3′
三乙胺催化的4-取代的2-酰基-3-氨基-6-甲基硫代[2,3 - b ]吡啶-4-羧酸乙酯IIIa-h与2,2,6-三甲基-4 H -1的反应, 3-二恶英-4-酮IV给出4-取代的乙基3-乙酰基-2-羟基-7-甲基噻吩并[2,3- b:4,5 - b ']二吡啶-9-羧酸盐Va-h。一些噻二吡啶(V)与过量的IV反应生成5-取代的乙基3-乙酰基-4,8-二甲基-2-氧代-2H-吡喃并[2,3- b ]-吡啶并[3',2': 4,5]噻吩并[2,3 - e ]吡啶-10-羧酸酯VI。