Geometric Selectivity of Pig Liver Esterase and its Application to the Separation of Fluorinated Bicyclic Esters
作者:Sames Sicsic、Jacques Leroy、Claude Wakselman
DOI:10.1055/s-1987-27868
日期:——
The hydrolysis of exo-2-ethoxycarbonyl-7-oxabicyclo[2.2.1]hept-5-enes 1-3 by pig liver esterase is much faster than that of the endo isomers. This allows an easy separation of an endo - exo mixture on a preparative scale.
Two ‘unnatural’ derivatives of shikimic acid, cis- and trans-6-trifluoromethylshikimicacid, have been synthesized in their racemic forms via the base-promoted opening of furan Diels–Alder adducts bearing a CF3 group. The relative stereochemistry of the trans-diastereoisomer has been confirmed by an X-ray analysis of its t-butyl ester.