申请人:Parcor
公开号:US04065459A1
公开(公告)日:1977-12-27
This invention relates to a process for the preparation of compounds having the formula: ##STR1## in which R.sub.1 is H or lower alkyl and R.sub.2 is H or lower alkyl, or phenyl or benzyl optionally substituted with at least one halogen or a lower alkyl, lower alkoxy, trifluoromethyl or nitro group. According to this method, a compound of the formula: ##STR2## in which R.sub.1 and R.sub.2 are as defined above and R.sub.3 is H or optionally substituted alkyl or benzyl, is reacted with a derivative Hal--SO.sub.2 --R (III) in which Hal is halogen and R is optionally substituted alkyl, aryl or aralkyl, to give a derivative of the formula: ##STR3## in which the various symbols have the above-defined meanings, and the sulfonated derivative of the formula (IV) is heated in the presence of an acid, to give the compound of the formula (I).
本发明涉及一种制备具有以下式子的化合物的方法: ##STR1## 其中R.sub.1为H或低碳基,R.sub.2为H或低碳基,或苯基或苄基,可选地带有至少一个卤素或低碳基,低烷氧基,三氟甲基或硝基基团。根据这种方法,将具有以下式子的化合物: ##STR2## 其中R.sub.1和R.sub.2如上所定义,R.sub.3为H或可选地取代的烷基或苄基,与衍生物Hal--SO.sub.2--R(III)反应,其中Hal为卤素,R为可选地取代的烷基,芳基或芳基烷基,以给出以下式子的衍生物: ##STR3## 其中各符号具有上述定义,式子(IV)的磺化衍生物在酸的存在下加热,以给出式子(I)的化合物。