Synthesis of macrocyclic systems from 4,4′-diamino-3,3′-bi-1,2,5-oxadiazole and 3(4)-amino-4(3)-(4-amino-1,2,5-oxadiazol-3-yl)-1,2,5-oxadiazole 2-oxides
作者:M. A. Epishina、A. S. Kulikov、N. N. Makhova
DOI:10.1007/s11172-008-0101-0
日期:2008.3
Oxidative cyclocondensation of 4,4′-diamino-3,3′-bi-1,2,5-oxadiazole and isomeric 3(4)-amino-4(3)-(4-amino-1,2,5-oxadiazol-3-yl)-1,2,5-oxadiazole 2-oxides under the action of dibro-moisocyanurate gave 12- and 18-membered macrocyclic systems containing two or three bifurazanyl or furazanylfuroxanyl moieties linked by azo bridges. The latter were oxidized into azoxy groups with Caro’s acid in 20% oleum.
4,4'-二氨基-3,3'-双-1,2,5-恶二唑和异构体3(4)-氨基-4(3)-(4-氨基-1,2,5-恶二唑)的氧化环缩合-3-基)-1,2,5-恶二唑2-氧化物在二溴-异氰脲酸酯的作用下产生包含两个或三个通过偶氮桥连接的联呋喃基或呋喃嗪基部分的12-和18-元大环体系。后者在 20% 发烟硫酸中被卡罗酸氧化成氧化偶氮基团。