Synthesis of the Taxol Core via Catalytic Asymmetric 1,4-Addition of an Alkylzirconium Nucleophile
作者:Jiao Yu Joseph Wang、Stephen P. Fletcher
DOI:10.1021/acs.orglett.0c01165
日期:2020.6.5
The Taxol core was prepared in five steps via a key copper-catalyzed asymmetric conjugate addition trapping sequence. The use of a bromodiene-derived alkylzirconium nucleophile followed by trapping with POCl3/DMF gave a highly functionalized intermediate featuring a quaternary center in 69% yield with 92% ee. After 1,2-addition, Suzuki–Miyaura cross-coupling, allylic oxidation, and a type II intramolecular
通过关键的铜催化不对称共轭物加成捕获顺序,可在五个步骤中制备紫杉醇核心。使用溴化二烯衍生的烷基锆亲核试剂,然后用POCl 3 / DMF捕集,可得到具有季中心的高官能度中间体,产率为69%,ee为92%。经过1,2-加成,Suzuki-Miyaura交叉偶联,烯丙基氧化和II型分子内Diels-Alder反应,紫杉醇核心的总收率为11%,ee为92%。