M. Smrcina et al., FACILE STEREOSELECTIVE SYNTHESIS OF GAMMA-SUBSTITUTED GAMMA-AMINO ACIDS FROM THE CORRESPONDING ALPHA-AMINO-ACIDS, Tetrahedron, 53(38), 1997, pp. 12867-12874
A facile stereoselective method for the synthesis of gamma-substituted
, gamma-amino acids from alpha-amino acids was developed. The key step
of the procedure is complete reduction of the keto functionality of a
lpha-amino acyl Meldrum's acid by sodium acetoxyborohydride. The resul
ting amino alkyl Meldrum's acid undergoes thermal decarboxylative ring
closure to a 5-substituted pyrrolidinone which yields, the correspond
ing gamma-amino acid after basic hydrolysis. The overall yield of the
procedure ranges from 40 to 65%. (C) 1997 Elsevier Science Ltd.