Asymmetric nitrone-vinyl sulfoxide cycloadditions: a highly enantioselective synthesis of (+)-sedridine
作者:Chantal Louis、Claude Hootelé
DOI:10.1016/0957-4166(95)00287-y
日期:1995.9
Cycloaddition of 2,3,4,5-tetrahydropyridine-1-oxide 1 to (Z)-(R)-vinyl sulfoxides 2a-d proceeds in high yield to give isoxazolidines 3a-d and 4a-d with complete exo selectivity and with 82–98% asymmetric induction. This method provides an efficient synthesis of the enantiomerically pure piperidine alkaloid (+)-sedridine 6a.
2,3,4,5-四氢吡啶-1-氧化物1与(Z)-(R)-乙烯基亚砜2 a-d的环加成反应高收率,得到异恶唑烷3 a-d和4 a-d,具有完全的外切选择性,且82-98 %不对称感应。该方法提供了对映体纯的哌啶生物碱(+)-sedridine 6 a的有效合成。