cyclopentanols with three contiguous stereocenters were prepared with impressive diastereocontrol through a samarium diiodide induced 5-exo-trig radical process. The chiral unsaturated oxo ester precursors were prepared with ee values up to 90 % from propionaldehyde through a two-step organocatalyzed aldolization and Wittig–Horner olefination reaction sequence.
通过二
碘化钐诱导的 5-exo-trig 自由基过程制备了具有三个连续立体中心的取代
环戊醇,并具有令人印象深刻的非对映控制。通过两步有机催化醛醇化和 Wittig-Horner 烯化反应序列,由
丙醛制备了 ee 值高达 90% 的手性不饱和羰基合成酯前体。