" Reaction times at-20 OC: 14 days for entries I, 2, 5, 7, and 8; 7 days for entries 3, 4, and 6. bDiastereomeric ratios determined by GC analysis of benzyl (entry 1) or methyl esters (entries 3-6) or by'H NMR analysis of benzyl ester (entry 2). CEe values determined after reductioin to the corresponding primary alcohol and conversion to the MTPA ester by'H NMR (entries 1-5, 7, and 8)(see: Dale, JA; Mosher, HSJ Am. Chem. SOC. 1973, 95, 512-519) or ...
