An efficient one-pot synthesis of 5-aryl substituted 2-amino-5,8-dihydropyrido[2,3-<i>D</i>] pyrimidin-4,7-diones under microwave irradiationl without catalyst
A series of 5-arylsubstituted2-amino-5,8-dihydropyrido[2,3-d]pyrimidin-4,7-diones were synthesized through one-pot condensation of 2,6-diaminopyrimidin-4-one, aldehyde and Meldrum's acid using glycol as energy transfer agent undermicrowave irradiation withoutcatalyst. The one-pot protocol in the absence of catalyst has the advantage of good yield (86-95%), short route and reaction time (3-6 min)
通过2,6-二氨基嘧啶-4-酮,醛和一锅缩合反应,合成了一系列5-芳基取代的2-氨基-5,8-二氢吡啶并[2,3- d ]嘧啶-4,7-二酮。以乙二醇为能量转移剂,在无催化剂的微波辐射下,Meldrum的酸。在没有催化剂的情况下,一锅法的优点是产率高(86-95%),路线和反应时间短(3-6分钟)且对环境友好。