Stereoselective condensation of alk-3-en-1-ylphosphonates with α -nitroalkenes gave the corresponding nitro compounds, which led to the stereoselective synthesis of 6-aryl-3,3a,4,5,6-pentahydrocyclopent[c]-isoxazole-5-ylphosphonates via intramolecular nitrile oxide -olefin cylco-addition in good yield. Cyclohex-2′-en-1′-ylmethylphosphonate behaves analogously.
烷基-3-烯-1-基
膦酸酯与α-硝基烯烃的立体选择性缩合反应生成相应的
硝基化合物,从而导致立体选择性合成6-芳基-3,3a,4,5,6-五氢环戊[c]-
异恶唑-通过分子内
一氧化氮-烯烃环加成的5-基
膦酸酯具有良好的收率。Cyclohex-2'-en-1'-
甲基膦酸酯的行为类似。