Reaktionen von Uracilen; 15<sup>1,2,3</sup>. 7-Ethoxypyrimido[4,5-<i>d</i>] pyrimidine über ein Uracil-carbodiimid-Derivat und deren Aminolyse- und Pyrolyse-Folgeprodukte
作者:Heinrich Wamhoff、Jürgen Muhr
DOI:10.1055/s-1988-27756
日期:——
Reactions of Uracils; 15.1,2,3 7-Ethoxypyrimido[4,5-d] pyrimidines via a Uracil-Carbodiimide Derivative and Their Products of Aminolysis and Pyrolysis Ethyl 1,3-dimethyl-6-(triphenylphosphoranylideneamino)uracil-5-carboxylate (2) reacts with isocyanates via a uracil-carbodiimide derivative to afford a new approach to 7-ethoxypyrimido[4,5-d]pyrimidines 3a-f. The aminolysis of 3a, b gives the substituted 7-aminopyrimido[4,5-d] pyrimidines 4a-c, whereas the pyrolysis of 3a gives 2,4,5,7-tetraoxo-1,2,3,4,5,6,7,8-octahydropyrimido [4,5-d]pyrimidine 5 by syn-elimination.
尿嘧啶的反应; 15.1,2,3 7-乙氧基嘧啶并[4,5-d]嘧啶通过尿嘧啶-碳二亚胺衍生物及其氨解和热解产物 1,3-二甲基-6-(三苯基亚正膦氨基)尿嘧啶-5-甲酸乙酯 (2) 反应通过尿嘧啶-碳二亚胺衍生物与异氰酸酯反应,提供了一种制备 7-乙氧基嘧啶并[4,5-d]嘧啶 3a-f 的新方法。 3a、b的氨解得到取代的7-氨基嘧啶并[4,5-d]嘧啶4a-c,而3a的热解得到2,4,5,7-四氧代-1,2,3,4,5,通过顺式消除得到6,7,8-八氢嘧啶并[4,5-d]嘧啶5。