Process for preparing pyrazolo(1,5-c)-quinazoline derivatives and novel intermediates
申请人:E.R. Squibb & Sons, Inc.
公开号:EP0023773A1
公开(公告)日:1981-02-11
A process is provided for preparing pyrazolo[1,5-c]-quinazoline derivatives of the structure
wherein X is 0 or S; R' is hydrogen, lower alkyl, hydroxymethyl, phenyl-lower alkyl, phenyl or phenyl substituted with halogen, lower alkyl, lower alkoxy, or trifluoromethyl; R2 is lower alkoxy, phenyl-lower alkoxy, phenoxy, or phenoxy substituted with lower alkyl or lower alkoxy; and R3 and R4 are the same or different and are selected from the group consisting of hydrogen, alkyl of 1 to 4 carbons, alkoxy of 1 to 4 carbons, lower alkanoyloxy of 1 to 4 carbons, nitro, benzyloxy, benzyloxy having a single mono- lower alkoxy substituent, halogen, hydroxy, and trifluoromethyl, wherein quinolone compounds of the structure
which are new intermediates, are reacted with a hydrazine compound to form a 5-(2-aminophenyl)-pyrazole which is then cyclized to the product.
In addition, the above product may be reacted with a halogen acid to form the corresponding hydroxymethyl compound.
本发明提供了一种制备
吡唑并[1,5-c]-
喹唑啉衍
生物的方法,其结构如下:
其中,X为0或S;R'为氢、低碳基、羟甲基、苯基-低碳基、苯基或卤素、低碳基、低碳氧基或三
氟甲基取代的苯基;R2为低碳氧基、苯基-低碳氧基、苯氧基或低碳基或低碳氧基取代的苯氧基;R3和R4相同或不同,选自氢、1至4碳的烷基、1至4碳的烷氧基、1至4碳的低烷酰氧基、硝基、苄氧基、带有单一单一低烷氧基取代基的苄氧基、卤素、羟基和三
氟甲基的群,其中新的中间体结构的
喹啉化合物如下:
与
肼化合物反应形成5-(2-
氨基苯基)-
吡唑,然后环化成产物。此外,上述产物可以与卤素酸反应形成相应的羟甲基化合物。