N -Boc-2-acyl oxazolidine methodology combined with ring-closing metathesis: a new approach towards the enantioselective synthesis of α-(1-hydroxyalkyl) nitrogen heterocycles
作者:Claude Agami、François Couty、Nicolas Rabasso
DOI:10.1016/s0040-4020(01)00458-6
日期:2001.6
A synthetic methodology, based on N-Boc-2-acyloxazolidine chemistry combined with ring-closing metathesis, allows the preparation of enantiopure piperidinic heterocycles showing a 2-(1-hydroxyalkyl) side-chain, a pattern commonly found in natural alkaloids. Synthesis of Δ-3,4-2,6-disubstituted piperidinic rings can thus be achieved with a good 2,6-cis or -trans stereocontrol, unless the substituent
一种基于N -Boc-2-酰基氧杂唑烷化学方法与闭环复分解相结合的合成方法,可以制备对映体纯的哌啶杂环,该杂环具有2-(1-羟烷基)侧链,这是天然生物碱中常见的模式。因此,除非位于C 2的取代基不是苯基,否则可以用良好的2,6-顺式或-反式立体控制来实现Δ-3,4-2,6-二取代的哌啶环的合成。Δ-3,4烯烃部分的非对映选择性官能化以及获得7或8元氮环也是该方法的关键特征。