We describe the desymmetrization of meso-glutaric anhydrides to chiral hemiesters using a bench-stable homodinuclear Ni-2-(Schiff base) complex as the catalyst in good to excellent yield (up to 99%) and enantioselectivity (up to 94%). Using the opposite enantiomer of the catalyst, we obtained the same yield and enantioselectivity with the opposite configuration, thereby gaining access to both hemiester enantiomers.
CAL-B catalyzed desymmetrization of 3-alkylglutarate: “olefin effect” and asymmetric synthesis of pregabalin
作者:Jae-Hoon Jung、Doo-Ha Yoon、Philjun Kang、Won Koo Lee、Heesung Eum、Hyun-Joon Ha
DOI:10.1039/c3ob40311d
日期:——
3-alkylglutaric acid diesters was performed to prepare opticallyactive 3-alkylglutaric acid monoesters bearing various alkyl substituents, including methyl, ethyl, propyl and allyl groups. Allyl esters showed far better stereoselectivity among the alkyl esters, suggesting possible π–π interactions between the olefin of the substrate and the Trp104 or His224 side chains at the enzyme active site. Based