Intramolecular radical allylation with allylic sulfones— A synthesis of (±)-botryodiplodin
作者:Robert Nouguier、Ste´phane Gastaldi、Didier Stien、Miche`le Bertrand、Philippe Renaud
DOI:10.1016/s0040-4039(99)00486-4
日期:1999.4
(±)-botryodiplodin (1). Several pathways, involving 5-exo-trig ring closure onto allylic sulfones, have been investigated. The iodine atom transfer methodology allowed the preparation of the desired skeleton through intramolecular addition of an α-alkoxycarbonyl radical to the double bond of the appropriate allylic ethyl sulfone. Subsequent deprotonation and kinetic reprotonation led to the key precursor14 with
异丙烯基5元环缩醛或内酯是(±)-botryodiplodin(1)的潜在前体。已经研究了几种途径,包括在烯丙基砜上的5- exo-trig闭环。碘原子转移方法允许通过将α-烷氧基羰基分子内加成到适当的烯丙基乙基砜的双键上来制备所需的骨架。随后的去质子化和动力学再质子化导致具有高立体选择性的关键前体14。图选项