Enantio- and Diastereoselective Synthesis of 1,5-<i>syn</i>-(<i>Z</i>)-Amino Alcohols via Imine Double Allylboration: Synthesis of <i>trans</i>-1,2,3,6-Tetrahydropyridines and Total Synthesis of Andrachcine
作者:Christophe Allais、William R. Roush
DOI:10.1021/acs.orglett.7b00995
日期:2017.5.19
A stereoselective synthesis of trans-1,2,3,6-tetrahydropyridines 8 is described. This synthesis proceeds via intramolecular Mistunobu reactions of 1,5-syn-(Z)-amino alcohols 7, which were prepared by a highly diastereo- and enantioselective double-allylboration reaction of aldehyde 5 and silylimine 6. The chiral bifunctional γ-borylallylborane 9E was generated in situ by hydroboration of allene 3 with
描述了反式-1,2,3,6-四氢吡啶8的立体选择性合成。这种合成经由1,5-分子内Mistunobu反应所得顺式( - Ž) -氨基醇7,其通过醛的高度diastereo-和不对称双allylboration反应制备5和silylimine 6。手性双官能γ-borylallylborane 9 Ë由丙二烯的硼氢化原位产生3与(diisopinocampheyl)硼烷4。该策略已应用于雄激素1的全合成,因此可以确定天然产品的绝对和相对构型。