Condensation reactions of 3-Amino-4-imino-4<i>H</i>-thieno-[3,4-<i>c</i>][1]benzopyran
作者:E. Nyiondi-Bonguen、E. Sopbué Fondjo、Z. Tanee Fomum、Dietrich Döpp
DOI:10.1002/jhet.5570330212
日期:1996.3
compound 1 reacts with trifluoroacetic anhydride to give the doubly trifluoracetylated derivative 2 and in addition the coumarin derivative 3. In refluxing DMF, two moles of 1 react with loss of one molecule of ammonia to afford 4, which undergoes subsequent N-acylation by β-dicarbonyl compounds 9a-f to yield N-acyl derivatives 10a-f. With dimethyl malonate (9a) besides compound 10a, the cycloacylated compound
标题化合物1与三氟乙酸酐反应,得到双三氟乙酰化衍生物2,此外还产生香豆素衍生物3。在回流的DMF中,两摩尔的1与失去一分子的氨反应以得到4,其随后通过β-二羰基化合物9a-f进行N-酰化以产生N-酰基衍生物10a-f。除了化合物10a以外,通过丙二酸二甲酯(9a),也以良好的收率获得了环酰化的化合物11。化合物11容易被酸和碱水解和脱羧成前述的稠合衍生物12。后者可以通过碱水溶液的作用转化为新的噻吩并嘧啶酮衍生物。