作者:Judit Kámán、Enikő Forró、Ferenc Fülöp
DOI:10.1016/s0957-4166(00)00070-7
日期:2000.4
Racemates of N-hydroxymethylated beta-lactams 4-6 were resolved through the lipase-catalyzed asymmetric acylation of the primary hydroxy group at the 6S stereogenic centre. High enantioselectivity (E > 200) was observed when the enzymatic reactions were performed in acetone with lipase PS as catalyst and vinyl butyrate as acyl donor. The hydrolysis of the enantiomeric azetidinones 4a-6a and 4b-6b resulted in the enantiomerically pure alicyclic beta-amino acids 4c-6c and 4d-6d. When the less reactive enantiomers 4b-6b were treated with NH4OH/MeOH, enantiomerically pure beta-lactams 4e-6e were formed. (C) 2000 Elsevier Science Ltd. All rights reserved.