| abstract |
Racemic Feist's acid is treated with (R)-(+)-α-methylbenzylamine to yield (1R-trans)-3-methylene-cyclopropane-1,2-dicarboxylic acid, (R)-α-methylbenzylamine (1:1) salt. This salt can then be converted to (1R-trans)-3-methylene-1,2-cyclopropanedicarboxylic acid, dimethyl ester which is an intermediate in the preparation of the antiviral agent [1R-(1α,2β,3α)]-2-amino-9-[2,3-bis(hydroxymethyl)cyclobutyl]-1,9-dihydro-6H-purin-6-one. The improved process also enables the recovery of racemic Feist's acid from the resolution. |