Stereospecific Pd(O)-Catalyzed Malonate Additions to Allylic Hydroxy Phosphonate Derivatives: A Formal Synthesis of (−)-Enterolactone
作者:Bingli Yan、Christopher D. Spilling
DOI:10.1021/jo035795h
日期:2004.4.1
A combination of cross-metathesis and malonate addition was applied to a formal synthesis of the mammalian lignan enterolactone 5. The cross-metathesis of alkene 6 and phosphonate 3a gave the substituted allylic phosphonate 3d. The palladium-catalyzed addition of malonate 10d to the allylic phosphonate 3d was stereospecific and highly regioselective and yielded the vinyl phosphonate 11d. The vinyl
交叉复分解和丙二酸酯添加的组合应用于哺乳动物木脂体肠内酯5的正式合成。烯烃6和膦酸酯3a的交叉复分解得到取代的烯丙基膦酸酯3d。钯催化的丙二酸酯10d向烯丙基膦酸酯3d的加成是立体特异性的,且具有高度区域选择性,并生成乙烯基膦酸酯11d。膦酸乙烯基酯11d分两步转化为内酯14,内酯14是肠内酯5合成中已知的中间体。