A Regio- and Diastereoselective Intramolecular Nitrone Cycloaddition for Practical 3- and 2,3-Disubstituted Piperidine Synthesis from γ-Butyrolactone
作者:Benjamin E. Stephens、Fei Liu
DOI:10.1021/jo8018285
日期:2009.1.2
3-disubstituted piperidines, featuring an intramolecular nitrone cycloaddition with high regio- and diastereoselectivity, was achieved in six steps and 36−66% overall yield from commercially available γ-butyrolactone or 1,4-butanediol. A new N-alkenyl nitrone enoate was used in this intramolecular nitrone cycloaddition, and the regioselectivity, diastereoselectivity, and reversibility of this cycloaddition were
快速,有效的方法可通过六个步骤实现3-和2,3-二取代哌啶的多样性导向合成,该化合物具有较高的区域选择性和非对映选择性的分子内硝酮环加成反应,其总收率可从市售的γ-中获得36-66%。丁内酯或1,4-丁二醇。在该分子内硝酮的环加成反应中,使用了新的N-烯基硝烯烯酸酯,并研究了该环加成反应的区域选择性,非对映选择性和可逆性。