作者:Nirmal D. Desai
DOI:10.1002/hc.20295
日期:2007.4
4-Hydrazino-7H-pyrrolo[2,3-d]pyrimidines 4 were cyclocondensed with formic acid or triethyl orthoformate to give 7H-pyrrolo[3,2-e][1,2,4]triazolo[1,5-c]pyrimidines 6 and 7H-pyrrolo[3,2-e][1,2,4]triazolo[4,3-c]pyrimidines 7, respectively. The [4,3-c] isomers 7 were rearranged into thermodynamically more stable [1,5-c] isomers 6. The identical compounds 6 were prepared using another route by reacting
4-肼基-7H-吡咯并[2,3-d]嘧啶4与甲酸或原甲酸三乙酯环缩合得到7H-吡咯并[3,2-e][1,2,4]三唑并[1,5-c ]嘧啶6和7H-吡咯并[3,2-e][1,2,4]三唑并[4,3-c]嘧啶7。[4,3-c] 异构体 7 被重排成热力学更稳定的 [1,5-c] 异构体 6。相同的化合物 6 是使用另一条路线通过 3-amino-4-imino-7H-pyrrolo[2] 反应制备的,3-d]嘧啶 3 与甲酸或原甲酸三乙酯。2-氨基-3-氰基吡咯1与原甲酸三乙酯反应得到N-乙氧基亚甲基-2-氨基-3-氰基吡咯2。与等量的水合肼进一步反应得到3-氨基-4-亚氨基-7H-吡咯[2 ,3-d]嘧啶 3,而用过量的水合肼处理,3 重排为 4-肼基-7H-吡咯并[2,3-d]嘧啶 4。还通过在过量的水合肼中处理N-乙氧基亚甲基-2-氨基-3-氰基吡咯2来获得化合物4。© 2007 Wiley