4.8 Article

Iridium-Catalyzed Asymmetric Hydrogenation of Tetrasubstituted alpha-Fluoro-beta-enamino Esters: Efficient Access to Chiral alpha-Fluoro-beta-amino Esters with Two Adjacent Tertiary Stereocenters

Journal

ORGANIC LETTERS
Volume 20, Issue 20, Pages 6349-6353

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.8b02503

Keywords

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Funding

  1. National Natural Science Foundation of China [21432007, 21502145]
  2. Natural Science Foundation of Hubei Province [2016CFB449]
  3. Wuhan Morning Light Plan of Youth Science and Technology [2017050304010307]
  4. Shenzhen Nobel Prize Scientists Laboratory Project [C17213101]
  5. Fundamental Research Funds for the Central Universities [2042018kf0202]
  6. Program of Introducing Talents of Discipline to Universities of China (111 Project)

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An iridium-catalyzed highly efficient asymmetric hydrogenation of challenging tetrasubstituted alpha-fluoro-beta-enamino esters was successfully developed using bisphosphine-thiourea (ZhaoPhos) as the ligand, which prepared a series of chiral alpha-fluoro-beta-amino esters containing two adjacent tertiary stereocenters with high yields and excellent diastereoselectivities/enantioselectivities (73%-99% yields, >25:1 dr, 91%-> 99% ee, and turnover number (TON) values up to 8600), and no defluorinate byproduct was detected.

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