acylation of 1-3 with ( +/- ) -2,2,5,5-tetramethyl-1-pyrrolidinyloxy-3-carboxylic acid ( 4 ) afforded diastereomeric mixtures of the esters 5-8 and the amides 9 and 10 .
C0007066
carboxylic acid
C0014898
esters