Synthesis of Derivatives of Pyrido[4,3-d]pyrimidin-4(3H)-onevia an Iminophosphorane
作者:Jian-Chao Liu、Hong-Wu He、Qing-Yun Ren、Ming-Wu Ding
DOI:10.1002/hlca.200690133
日期:2006.7
A series of new, 2-substituted 3-aryl-8,9,10,11-tetrahydro-5-methyl[1]benzothieno[3′,2′ : 5,6]pyrido[4,3-d]pyrimidin-4(3H)-ones, compounds 5a–q, were designed and synthesized via the aza-Wittig reaction as the key step. The iminophosphorane 1 reacted with phenyl isocyanate (or 4-chlorophenyl isocyanate) to the carbodiimide 4, which was cyclized to 5 upon addition of different amines, EtOH, or phenols
一系列新的2-取代的3-芳基-8,9,10,11-四氢-5-甲基[1]苯并噻吩并[3',2':5,6]吡啶基[4,3- d ]嘧啶-通过aza- Wittig反应设计并合成了4(3 H)-ones,化合物5a - q,这是关键步骤。亚氨基磷烷1与异氰酸苯酯(或4-氯苯基异氰酸酯)反应生成碳二亚胺4,在催化量的EtONa或K 2 CO 3存在下,通过添加不同的胺,EtOH或酚,将其环化为5(方案1和2)。化合物的结构5,通过IR,确认1 H-和13 C-NMR,EI-MS,元素分析,和,在的情况下5升,通过单晶X射线衍射(图)。