A novel transformation of β-1,2,3-thiadiazol-5-yl enamines into thieno[2,3-d]pyridazines
作者:Yuri Rozin、Sergey Zhidovinov、Tetyana Beryozkina、Yuri Shafran、Gert Lubec、Oleg Eltsov、Pavel Slepukhin、Uwe Knippschild、Joachim Bischof、Wim Dehaen、Vasiliy Bakulev
DOI:10.1016/j.tetlet.2015.02.013
日期:2015.3
dienamines or novel thieno[2,3-d]pyridazines depending on the time and reaction temperature. Conditions were found for the selective synthesis of thieno[2,3-d]pyridazines. A plausible mechanism involves formation of C–S and C–C bonds and a novel ring rearrangement of 5-vinyl-1,2,3-thiadiazoles into pyridazine-4-thiolates. A series of new diamides of 2-(4-carboxy-1,2,3-thiadiazol-5-yl)thieno[2,3-d]pyridazine-7-carboxylic
β-1,2,3-噻二唑-5-基烯胺与乙酰氯在1,4-二恶烷中的反应会导致二烯胺或新型噻吩并[2,3- d ]哒嗪的形成,具体取决于时间和反应温度。发现了噻吩并[2,3- d ]哒嗪选择性合成的条件。可能的机理包括C–S和C–C键的形成以及5-乙烯基-1,2,3-噻二唑向哒嗪-4-硫醇盐中的新环重排。通过使甲酯与伯胺和叔胺反应,制得一系列新的2-(4-羧基-1,2,3-噻二唑-5-基)噻吩并[2,3 - d ]哒嗪-7-羧酸二酰胺。仲胺。