[GRAPHICS]
A highly efficient enantioselective synthesis of (S)-(-)-acromelobic acid (
1) was achieved via asymmetric hydrogenation of dehydroamino acid derivativ
e (3) using (R,R) [Rh(DIPAMP)(COD)]BF4 catalyst followed by removal of prot
ective groups in >98% ee and good over all yield. The key intermediate (3)
was prepared from the commercially available citrazinic acid (4) in six ste
ps.