Preparation of new nitrogen-bridged heterocycles. XIII Syntheses of some tricyclic and tetracyclic indolizine derivatives with antiallergic activity.
作者:AKIKAZU KAKEHI、SUKETAKA ITO、TOSHIAKI YOTSUYA
DOI:10.1248/cpb.34.2435
日期:——
Alkaline treatment of 2, 3-annelated 1-ethoxycarbonylmethylpyridinium bromides was investigated as a method for the preparation of 1, 8-annelated indolizine derivatives. The reaction of 1-ethoxycarbonylmethyl-2, 3-cyclopentenopyridinium bromide (1) with ethanolic sodium ethoxide did not afford any significant products, but similar treatment of 1-ethoxycarbonylmethyl-2, 3-cyclohexenopyridinium bromide (8) gave the expected 1, 8-annelated 2(3H)-indolizinone, 8, 9-dihydro-7H-pyrrolo[3, 2, 1-ij]quinolin-1(2H)-one (9), in 53% yield. The reactions of the salt 8 with a base in the presence of some vinylating and alkylating or acylating agents afforded the corresponding 1-alkoxy- or 1-acyloxy-2-vinylpyrroloquinoline derivatives (26-35), which were further transformed to tetracyclic indolizines fused with a furan or a puran ring. Some of these tricyclic and tetracyclic indolizines showed antiallergic activity.
2, 3-叠氮化1-乙氧羰基甲基吡啶溴化物的碱性处理被研究作为制备1, 8-叠氮化吡咯啉衍生物的方法。1-乙氧羰基甲基-2, 3-环戊烯吡啶溴化物(1)与乙醇钠乙氧化物反应未能得到任何显著产物,但对1-乙氧羰基甲基-2, 3-环己烯吡啶溴化物(8)的类似处理则得到了预期的1, 8-叠氮化2(3H)-吡咯啉酮,8, 9-二氢-7H-吡咯[3, 2, 1-ij]喹啉-1(2H)-酮(9),产率为53%。盐8与碱在某些乙烯化、烷基化或酰基化试剂存在下的反应,得到相应的1-烷氧基或1-酰氧基-2-乙烯基吡咯啉喹啉衍生物(26-35),进一步转化为与呋喃或呋喃环融合的四环吡咯啉。部分这些三环和四环吡咯啉显示出抗过敏活性。