A. Kanazawa et al., PRACTICAL ASYMMETRIC APPROACH TO PYRROLIDINONES - EFFICIENT SYNTHESISOF (-PREUSSIN AND (-)-AHPPA()), Journal of organic chemistry, 63(14), 1998, pp. 4660-4663
A novel, dichloroketene-chiral enol ether cycloaddition-based synthesi
s of enantiopure (+)-preussin and (-)-AHPPA has been realized. The eff
icient, highly stereoselective approach, which involves a Beckmann rin
g expansion reaction to access the key pyrrolidinone, proceeds in ca.
16% overall yield for each of the compounds.