Abstract
A veriety of syntheic approaches to diterpens resin acids have been reported recently. Stereoselective syntheses of resin acids related to poducarpic acid(1) have been accomplished by Meyer and Maheshwari1, Giarrusso and Ireland2, Kuehne and Nelsor3, Mori and Matsui4, Spencer and Coworker5and also by Pelletier and coworkers6. Likewise, stereoselective syntheses of resin acids related to abietic acid(2)have beer achieved by Stork and Schulenberg7, Ireland and Kierstead, and coworkers,11