| 摘要 |
<p>The novel title cpds. are of formula:- (in which R1 and R2 are independently 1-4C alkyl or 2-3C alkyl substd. by 1-3C alkoxy, or NR1R2 forms a 5-7 membered heterocyclic ring opt. contg. an oxygen as additional heteroatom, and opt. substd. by 1-4C alkoxy, and R3 and R4 are independently 1-6C alkyl or 2-6C alkyl substd. by 1-6C alkoxy, with the proviso that when both R3 and R4 are unsubstd. alkyl one of them contains at least two 2C atoms), together with their acid addn. salts. They may be prepd. by e.g. reacting corresp. cpds. in which R3O and/or R4O are replaced by halogen with an alkali metal deriv. of R4OH, by reacting corresp. cpds. in which R1R2N is replaced by halogen with R1R2NH.</p> |
