Add time:09/06/2019         Source:sciencedirect.com

2-chloro-3-keto esters were quantitatively hydrogenated to syn and anti 2-chloro-3-hydroxyester by asymmetric hydrogenation with chiral ruthenium (II) catalysis prepared in-situ from (COD)Ru(2-Methylallyl)2 in presence of atropisomeric ligands such as MeO-Biphep and Binap, giving enantioselectivity up to 99%. 2-chloro-3-hydroxy esters were treated with different bases to give (E)- and (Z)-2,3-epoxyalkanoates in 65–90% yields with 84–97% ee.

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