Diastereo- and Enantiocontrolled Synthesis of (-)-Allosedaminevia Cycloaddition of a Chiral Nitrone
作者:Wolfgang Oppolzer、J�rg Deerberg、Osamu Tamura
DOI:10.1002/hlca.19940770217
日期:1994.3.23
(1) has been synthesized, in 21% overall yield, in nine steps starting from the formyl-ester 4. The synthesis features the reaction cascade 7 3 2, involving asymmetric electrophilic enolate hydroxyamination, hydroxylamine/aldehyde condensation, and nitrone/styrene cycloaddition, as well as the reductive N/O cleavage-decyanation 12 1.
从甲酰基酯4开始,九步合成了哌啶生物碱(-)-allosedamine(1),总产率为21%。该合成具有反应级联7 3 2,包括不对称的亲电烯醇式羟基胺化,羟胺/醛缩合和硝酮/苯乙烯环加成反应,以及还原性N / O裂解-脱氰作用12 1。