A new heterocyclic system, 1,2,9-triaza-8-oxabicyclo-[5.3.0]-3,5,9-decatriene 4, has been synthesized by regiospecific 1,3-dipolar cycloaddition of nitrile oxides to the imine double bond of 1,2-diazepines. Bis-adduct 5a is obtained in only trace amounts showing that the imine double bond is more reactive than the Δ4-olefinic bond.
一种新的杂环体系,1,2,9-三氮杂八-氧杂双环-[5.3.0] -3,5,9-癸
三烯4,是通过将
亚硝酸盐与
亚胺双键的区域特异性1,3-偶极环加成而合成的1,2-二氮杂的键合。双加合物5A仅在跟踪获得的数额显示该
亚胺双键比Δ更具反应性的4 -olefinic键。