Lewis acid catalysed cycloaddition of the dienes (1) and (2) to 2-chloroacrylonitrile occurs in high yield and with stereoselectivity to give the corresponding adducts (3) and (4) which can be rearranged upon treatment with fluoride ion to the bicyclic cyclohexenones (5) – (8).
路易斯酸催化二烯(1)和(2)与
2-氯丙烯腈的环加成反应,收率高,且具有立体选择性,生成相应的加合物(3)和(4),在用
氟离子处理后可以将其重新排列成双环
环己烯酮(5)–(8)。