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.
本发明揭示了具有以下式子的新化合物:##STR1##其中,R.sub.1,R.sub.2和R.sub.3各自独立地选自氢、羟基、氯、溴、具有最多3个碳原子的烷基基团、具有最多3个碳原子的烷氧基团和三氟甲基的类别,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选自氢、具有最多3个碳原子的烷基基团、具有最多4个碳原子的烯丙基基团、环丙基甲基基团或苯乙基基团的类别;W和W'各代表具有最多3个碳原子的一价烷基基团,或W-W'共同代表具有以下式子的二价基团:##STR2##其中n是2或3的整数,包括单个光学活性异构体、外消旋混合物和非毒性药理可接受的酸加合盐。这些化合物在哺乳动物的镇痛剂中很有用。它们可以通过用紫外光照射二烷氧基乙烯和以下式子的马来酰亚胺的混合物来制备:##STR3##以产生4,4-二烷氧基-N-烷基-1-苯基-1,2-环丁烷二酰亚胺,并对其进行化学还原。还描述了其他三种制备方法。