| 摘要 |
Analgesic compounds are of the general formula (I): <CHEM> in which, R<1> and R<2> each represents hydrogen or C1-C6 alkyl, or R<1> and R<2> together with the nitrogen atom to which they are attached form a heterocycle; E represents methylene, sulphur, oxygen or imino group optionally substituted with C1-C6 alkyl or aralkyl; ring A is aryl or heteroaryl ring, optionally substituted; R<3> is hydrogen or C1-C6 alkyl and R<4> is hydrogen or R<3> and R<4> together represent a group of formula (IV): -(CR<a>R<a>)m-C(=Y)- (IV) (wherein R<a> and R<a> is C1-C6 alkyl or hydrogen, up to a maximum of 3 alkyl groups, m is 1, 2, or 3, and Y is two hydrogens or oxygen); provided that when E represents a methylene group, then R<3> is a C1-C6 alkyl group or R<3> and R<4> together represent a group of the formula (IV).
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