Stereospecific Synthesis of (R)- and (S)-Baclofen and (R)- and (S)-PCPGABA (4-Amino-2-(4-chlorophenyl)butyric Acid) via (R)- and (S)-3-(4-Chlorophenyl)pyrrolidines.
Stereospecific Synthesis of (R)- and (S)-Baclofen and (R)- and (S)-PCPGABA (4-Amino-2-(4-chlorophenyl)butyric Acid) via (R)- and (S)-3-(4-Chlorophenyl)pyrrolidines.
Stereospecific Synthesis of (R)- and (S)-Baclofen and (R)- and (S)-PCPGABA (4-Amino-2-(4-chlorophenyl)butyric Acid) via (R)- and (S)-3-(4-Chlorophenyl)pyrrolidines.
作者:Shigeyuki YOSHIFUJI、Mamoru KANAME
DOI:10.1248/cpb.43.1302
日期:——
(R)- and (S)-Baclofen and (R)- and (S)-PCPGABA [4-amino-2-(4-chlorophenyl)butyric acid] were stereospecifically synthesized via (R)- and (S)-3-(4-chlorophenyl)pyrrolidines, starting from trans-4-hydroxy-L-proline. The syntheses involve two key operations, namely, 1) a stereoselective hydrogenation of dehydroproline derivatives controlled by the C-2 carboxyl function and 2) an effective ruthenium tetroxide oxidation to prepare chiral 3- and 4-(4-chlorophenyl)pyrrolidin-2-ones, which are dehydrated precursors of the target molecules.