Iridium-Catalyzed Asymmetric Hydrogenation Of Gamma- And Delta-Ketoacids For Enantioselective Synthesis Of Gamma- And Delta-Lactones
ORGANIC LETTERS(2020)
Abstract
A highly efficient asymmetric hydrogenation of gamma- and delta-ketoacids was developed by using a chiral Spiro iridium catalyst (S)-1a, affording the optically active gamma- and delta-hydroxy acids/lactones in high yields with excellent enantioselectivities (up to >99% ee) and turnover numbers (TON up to 100000). This protocol provides an efficient and practical method for enantioselective synthesis of Ezetimibe.
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