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Download fileEnantioselective Synthesis of Medium-Sized-Ring Lactones via Iridium-Catalyzed Z‑Retentive Asymmetric Allylic Substitution Reaction
journal contribution
posted on 2022-03-10, 14:03 authored by Lu Ding, Hao Song, Chao Zheng, Shu-Li YouMedium-sized rings are important
structural units, but their synthesis,
especially in a highly enantioselective manner, has been a great challenge.
Herein we report an enantioselective synthesis of medium-sized-ring
lactones by an iridium-catalyzed Z-retentive asymmetric
allylic substitution reaction. The reaction features mild conditions
and a broad substrate scope. Various eight- to 11-membered-ring lactones
can be afforded in moderate to excellent yields (up to 88%) and excellent
enantioselectivity (up to 99% ee). The utilization of both Z-allyl precursors and an Ir catalyst is critical for the
medium-sized-ring formation.