New tetracyclic 6H-[1]benzopyrano[3,4-e]pyrazolo[1,5-a]pyrimidin-6-ones (4a-e) have been synthesized through the condensation under acidic conditions of [1]benzopyrano[4,3-c][1,5]-benzodiazepin-7(8H)-one (1) and a series of 3,4-disubsituted 5-amino-1H-pyrazoles 3a-e.
在[1]苯并
吡喃并[4]的酸性条件下缩合反应合成了新的四环6 H- [1]苯并
吡喃并[3,4- e ]
吡唑并[1,5 - a ]
嘧啶-6-酮(4a-e)。 ,3- c ] [1,5]-苯并二氮杂-7(8 H)-one(1)和一系列3,4-二取代的5-amino-1 H-
吡唑3a-e。