Diels–Alder cycloaddition of 2-azadienes to methyl 2-(2,6-dichlorophenyl)-2H-azirine-3-carboxylate in the synthesis of methyl 4-oxo-1,3-diazabicyclo[4.1.0]heptane-6-carboxylates
作者:M.José Alves、M.Miguel Durães、A.Gil Fortes
DOI:10.1016/j.tet.2004.06.004
日期:2004.7
and 8 formed from dienes 1 due either to isomerization of the cycloadducts 7 and 8 or by isomerization of the CN bond of the diene during the reaction. The isomer 10 is formed from diene 2e, and a single diastereoisomer structure 4a–i is formed from dienes 11. Some pyrimidones 8a, 7c/8c, 7e, 10, 11d have been hydrolyzed leading to functionalised aziridines 12, 13 and 15.
通过亲核2-氮杂二烯与亲电子2 H-叠氮基之间的狄尔斯-阿尔德环加成反应,获得了许多新型的4-oxo-1,3-二氮杂双环[4.1.0]庚烷-6-羧酸盐稠合化合物。。该反应完全内切和区域选择性选择性的,由它的较少受阻面至二烯加入氮杂环丙烯。由于环加合物7和8的异构化或通过在反应过程中二烯的C 8N键的异构化,由二烯1形成两种异构体7和8。异构体10由二烯2e形成,单个非对映异构体结构4a –我是由二烯11组成。某些嘧啶酮8A,图7c / 8C,7E,10,11D已被水解,导致官能氮丙啶12,13和15。