申请人:American Cyanamid Company
公开号:US04431661A1
公开(公告)日:1984-02-14
Novel compounds are disclosed having the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are each individually selected from the class consisting essentially of hydrogen, hydroxy, chloro, bromo, an alkyl radical having up to 3 carbon atoms, an alkoxy radical having up to 3 carbon atoms, and trifluoromethyl, and any two or more of R.sub.1, R.sub.2 and R.sub.3 may be the same; R.sub.4 is selected from the class consisting essentially of hydrogen, an alkyl radical having up to 3 carbon atoms, an allyl radical having up to 4 carbon atoms, the cyclopropylmethyl radical or the phenethyl radical; and W and W' each represent a monovalent alkyl moiety having up to 3 carbon atoms or W-W' jointly represent a divalent moiety of the formula ##STR2## where n is an integer of 2 or 3, including individual optically active isomers, racemic mixtures thereof, and non-toxic pharmacologically-acceptable acid-addition salts thereof. Such compounds are useful as analgesics in mammals. They can be prepared by irradiating with ultra-violet light a mixture of a dialkoxyethylene and a maleimide of the formula ##STR3## to produce a 4,4-dialkoxy-N-alkyl-1-phenyl-1,2-cyclobutanedicarboximide, and chemically reducing the same. Three other processes of preparation are also described.
揭示了具有以下结构式的新化合物:其中R.sub.1、R.sub.2和R.sub.3分别从氢、羟基、氯、溴、最多具有3个碳原子的烷基基团、最多具有3个碳原子的烷氧基团和三氟甲基类别中各自选取,且R.sub.1、R.sub.2和R.sub.3中的任意两个或更多个可以相同;R.sub.4从氢、最多具有3个碳原子的烷基基团、最多具有4个碳原子的烯丙基基团、环丙基甲基基团或苯乙基基团中选取;W和W'各自代表最多具有3个碳原子的一价烷基基团,或W-W'共同代表公式的二价基团,其中n是2或3的整数,包括各个光学活性异构体、它们的消旋混合物以及非毒性、药理学上可接受的酸加合盐。这些化合物在哺乳动物中作为镇痛剂有用。它们可通过紫外线照射二烷氧基乙烯和公式的马来酰亚胺的混合物来制备,以产生4,4-二烷氧基-N-烷基-1-苯基-1,2-环丁烷二甲酸二亚胺,并对其进行化学还原。还描述了其他三种制备方法。