Synthesis of 1,5-dihydro-5-(4-methoxyphenyl)-4H-pyrazolo[3,4-d]pyrimidin-4-ones and their ribosides and mannich bases
作者:Peter Finlander、Erik B. Pedersen
DOI:10.1002/ardp.19853180512
日期:——
orthoformate and amines. Ethyl N‐(4‐methoxyphenyl)formimidate and N,N′‐bis(4‐methoxyphenyl)formamidine could also be used as the ring closing reagent. The Mannich bases 13 and 14 were produced in a reaction of 9 with formaldehyde and piperidine. The ribosides 15 were obtained by melting a mixture of 9 and 1,2,3,5‐tetra‐O‐acetyl‐β‐D‐ribofuranose in the presence of p‐toluenesulphonic acid.
1,5-二氢-4H-吡唑并[3,4-d]嘧啶-4-酮5和6通过相应的5-氨基吡唑-4-羧酸乙酯与原甲酸三乙酯和胺反应制备。N-(4-甲氧基苯基)甲酰亚胺乙酯和N,N'-双(4-甲氧基苯基)甲脒也可用作闭环试剂。曼尼希碱 13 和 14 是在 9 与甲醛和哌啶的反应中产生的。核糖 15 是通过在对甲苯磺酸存在下熔化 9 和 1,2,3,5-四-O-乙酰-β-D-呋喃核糖的混合物而获得的。