The reaction of homophthalic anhydride and N-(furan-2-yl-methylidene)- benzylamine in different solvents and varying temperatures was studied in detail. Mixtures of the expected trans- and cis-1,2,3,4-tetrahydroisoquinoline-4-carboxylic acids trans-5 and cis-5, alongwith by-products 6 and 7 were obtained in dichloroethane or benzene. In pyridine, used for the first time, the reaction became completely diastereoselective, giving only the trans isomer. The carboxylic acid group of trans-5 was transformed in four steps into cyclic aminomethyl groups which yielded various new tetrahydroisoquinolinones trans- 11a-g, incorporating both a known fragment of pharmacological interest and various pharmacophoric substituents.
                                    我们详细研究了同苯二
甲酸酐与N-(
呋喃-2-基-亚甲基)-
苄胺在不同溶剂和不同温度下的反应。在
二氯乙烷或苯中获得了预期的反式和顺式
1,2,3,4-四氢异喹啉-4-羧酸转化物trans-5和cis-5,以及副产物6和7。在首次使用的
吡啶中,反应变得完全消旋选择性,仅生成反式异构体。trans-5的
羧酸基团经过四步转化为环状
氨基甲基基团,产生了多种新的
四氢异喹啉酮trans-11a-g,包含了一个已知的药理兴趣片段及各种药效团取代基。