An efficient synthesis of 2,3,6,7-tetrasubstituted 4,6-dihydro-4-oxo-3H-pyrrolo[3,4-d]pyrimidin-7-carbonitrile derivatives
作者:Ping He、Zai-Fang Li、Qiu-Fei Hou、Yan-Ling Wang、Kun Zhao
DOI:10.3998/ark.5550190.0014.316
日期:——
with equimolar quantities of aromatic isocyanates to give carbodiimides 4. Further reaction of carbodiimides 4 with various amines or phenols then gave 2,3,6,7-tetrasubstituted 4,6-dihydro-4oxo-3H-pyrrolo[3,4-d]pyrimidin-7-carbonitrile derivatives 6 in satisfactory yields in the presence of a catalytic amount of sodium ethoxide or potassium carbonate.
由 4-氨基-5-氰基-1-苯基-1H-吡咯 3-羧酸乙酯 (2) 与三苯基膦、六氯乙烷和三乙胺反应制备的亚氨基正膦 3 与等摩尔量的芳族异氰酸酯反应得到碳二亚胺 4。 进一步反应碳二亚胺 4 与各种胺或酚的反应然后得到 2,3,6,7-四取代的 4,6-dihydro-4oxo-3H-pyrrolo[3,4-d]pyrimidin-7-carbonitrile 衍生物 6催化量的乙醇钠或碳酸钾。