Studies on Seven-membered Ring Compounds. XXIII. Reactions of Tropylium Ions Having Fused Heterocyclic System with Various Amines
作者:Nobuo Soma、Jun-ichi Nakazawa、Taiichiro Watanabe、Yoshio Sato、Genshun Sunagawa
DOI:10.1248/cpb.15.627
日期:——
Reactions of tropylium ions having a fused heterocyclic system with various amines were examined. Reaction of 2-phenyloxazolotropylium monomethylsulfate (I) and 2-phenylthiazotropylium chloride (XXIV) with dimethylamine produced 2-phenyl-6-dimethylamino-6H-cycloheptoxazole (II) and 6-dimethylamino-2-phenyl-6H-cycloheptathiazole (XXV), respectively. Regarding the reaction with p-toluidine, both I and 1-p-tolyl-2-phenylimidazolotropylium chloride (XXVI) gave 1-p-tolyl-2-phenyl-1, 6-dihydrocycloheptimidazole (VI) and 1-p-tolyl-2-phenyl-6-p-tolylimino-1, 6-dihydrocycloheptimidazole (VII). Reaction of I with N-methylaniline produced 2-phenyl-6-p-methylaminophenyl-6H-cycloheptoxazole (XIX) and 2-phenyl-4-p-methylaminophenyl-4H-cycloheptoxazole (XX). From these results, it is concluded that the tropylium ions condensing a heterocycle has a priority for amination at C-6.
研究了具有融合杂环体系的托品鎓离子与各种胺的反应。2- 苯并恶唑丙基鎓一甲基硫酸盐(I)和 2- 苯并噻唑丙基鎓氯化物(XXIV)与二甲胺反应,分别生成了 2-苯基-6-二甲氨基-6H-环庚恶唑(II)和 6-二甲氨基-2-苯基-6H-环庚硫唑(XXV)。至于与对甲苯胺的反应,I 和 1-对甲苯基-2-苯基咪唑基氯化铵(XXVI)都得到了 1-对甲苯基-2-苯基-1,6-二氢环庚基咪唑(VI)和 1-对甲苯基-2-苯基-6-对甲苯基咪唑基-1,6-二氢环庚基咪唑(VII)。I 与 N-甲基苯胺反应生成了 2-苯基-6-对甲氨基苯基-6H-环庚恶唑(XIX)和 2-苯基-4-对甲氨基苯基-4H-环庚恶唑(XX)。从这些结果中可以得出结论,托品鎓离子缩合杂环时优先在 C-6 处进行胺化。