4-Hydrazino-7H-pyrrolo[2,3-d]pyrimidines (4) were cyclocondensed with formic acid or triethyl orthoformate to give 7H-1,2,4-triazolo[1,5-c]pyrrolo[3,2-e]pyrimidines (5) and 7H-1,2,4-triazolo[4,3-c]pyrrolo-[3,2-e]pyrimidines (6) respectively. The [4,3-c]-isomers (6) were rearranged into thermodynamically more stable [1,5-c]-isomers (5). The identical compounds (5) were prepared using another route by
将4-Hydrazino-7 H-
吡咯并[2,3- d ]
嘧啶(4)与
甲酸或
原甲酸三乙酯环缩合,得到7 H -
1,2,4-三唑并[1,5- c ]
吡咯并[3, 2- e ]
嘧啶(5)和7 H -
1,2,4-三唑并[4,3- c ]
吡咯并-[3,2- e ]
嘧啶(6)。将[4,3- c ]异构体(6)重新排列成热力学上更稳定的[1,5- c ]异构体(5)。通过3-
氨基-4-亚
氨基-7的反应,使用另一种方法制备相同的化合物(5)。H-
吡咯并[2,3- d ]
嘧啶(3)与
甲酸或
原甲酸三乙酯。(2-
氨基-3- cyanopyrroles反应1)与
原甲酸三乙酯,然后
肼解得到(3)通过形成Ñ -ethoxymethylene -2-
氨基-3- cyanopyrroles(2)。