(S)-7-hydroxy-5-aza-8a-epi-d-swainsonine [(3S,4S,4aS,5S,6R)-octahydropyrrolo[1,2-b]pyridazine-3,4,5,6-tetraol] was accessed in good overall yield from readily available d-erythrosyl benzylidene acetal buta-1,3-diene. The key step of the reaction sequence is a full stereoselective Diels–Alder cycloaddition between the diene and dienophile: diethyl azodicarboxylate (DEAD) or di-tert-butyl azodicarboxylate (DBAD)
                                    ( S )-7-hydroxy-5-aza-8a- epi-的五步合成d-swainsonine [(3 S ,4 S ,4a S ,5 S ,6 R )-octahydropyrrolo [1,2- b ]pyridazine-3,4,5,6-tetraol] 以良好的总产率从现成的d-赤藓糖基亚苄基
乙缩醛丁-1,3-二烯。反应序列的关键步骤是二烯和亲二烯体之间的完全立体选择性 Diels-Alder 环加成:
偶氮二甲酸二乙酯 (
DEAD) 或
偶氮二甲酸二叔丁酯 (
DBAD)。环加合物进一步转化为标题 5-氮杂-中氮
茚。获得了用于合成中间体和产物的优化程序。