Bromoalkylphthalazinones and isomeric oxazolinium salts as intermediates and synthons
作者:A. Csámpai、K. Körmendy、P. Sohár、F. Ruff
DOI:10.1016/s0040-4020(01)89500-4
日期:1989.1
compounds both the open-chain 2-bromoalkyl derivatives and their cyclic isomers. Substitution reactions of bromoalkyl compounds may be assisted by polar solvents and by neighbouring group effect of hydrazinocarbonyl moiety. Nucleophiles attack the condensed oxazolinium ring in tricyclic intermediates at the saturated carbon bonded to the oxygen with ring opening. Addition of piperidine to unsaturated
2(ω-哌啶子基烷基)酞嗪-1(2H)-1可以由2-羟基烷基化合物制备,既可以是开链的2-溴烷基衍生物,也可以是它们的环状异构体。溴烷基化合物的取代反应可以通过极性溶剂和肼基羰基部分的邻近基团效应来辅助。亲核分子在三环中间体中的稠合的恶唑啉鎓盐环上以开环键合到与氧键合的饱和碳上,攻击环上的稠合恶唑啉鎓环。仅在具有恶唑啉鎓和强吸电子am基部分的四环双阳离子中发现将哌啶加成至不饱和亚氨基-碳。