Synthesis of 6,6-Disubstituted Tetrahydrothiopheno [3,4-c] Isoxazolines from β-Nitroenones
作者:Mohammed Ahrach、Raphaël Schneider、Philippe Gérardin、Bernard Loubinoux
DOI:10.1080/00397919708006787
日期:1997.6
the presence of a catalytic amount of triethylamine, undergo either Intramolecular Nitrile Oxide Cycloadditions (INOC) or Intramolecular Silylnitronate Cycloadditions (ISOC) to functionalized 6,6-disubstituted tetrahydrothiopheno [3,4-c] isoxazolines 3 and 4. The stereoselectivity, poor by the INOC reactions starting from acyclic β-nitroenones, is markedly increased with the ISOC procedure.
摘要 β-硝基硫化物 2,在催化量的三乙胺存在下,由 prop-2-en-1-硫醇与 β-硝基烯酮 1 迈克尔加成形成,经过分子内氧化腈环加成 (INOC) 或分子内亚硝基甲硅烷环加成 (ISOC) ) 到官能化的 6,6-二取代四氢噻吩 [3,4-c] 异恶唑啉 3 和 4。从无环 β-硝基烯酮开始的 INOC 反应较差的立体选择性随着 ISOC 程序显着增加。