A new efficient method has been developed for the synthesis of highly biologically active pyrano-[4,3-d]pyrazolo[3,4-b]pyridines on the basis of Smiles rearrangement of ethyl [(8-alkyl(aryl)-5-cyano-3,3-dimethyl-3,4-dihydro-1H-pyrano[3,4-c]pyridin-6-yl)oxy]acetates. Intermediate acetohydrazides have also been isolated. The proposed procedure is advantageous due to the possibility of avoiding experimentally
在乙基[(8-烷基(芳基)-5)的Smiles重排的基础上,已开发出一种新的高效方法,用于合成高
生物活性的
吡喃并[ [4,3- d ]
吡唑并[3,4- b ]
吡啶-
氰基-3,3-二甲基-3,4-二氢-1 H-
吡喃并[3,4- c ]
吡啶-6-基)氧基]
乙酸盐。也已分离出中间体乙酰
肼。由于可以避免实验上困难的
氯化阶段,因此所提出的方法是有利的。