Porcine pancreatic lipase was used in the chemoenzymatic hydrolysis of 2-azido-3-hydroxy-3-methylcarbonyloxybutyl acetate The reaction occurred with high regio- and stereoselectivity to give enantiomerically pure (2S.3R)-3-azido-2-4-dihydroxy butyl acetate 5 (e.e. > 99%) which was easily converted to (2S,3S)-2-amno-3.4-dihydroxybutyric acid 1. an important synthetic intermediate in the synthesis of beta -lactam antibiotics and phytosiderophores, (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthetic studies towards diazepanone scaffolds
作者:Olivier Monasson、Maryon Ginisty、Janez Mravljak、Gildas Bertho、Christine Gravier-Pelletier、Yves Le Merrer
DOI:10.1016/j.tetasy.2009.09.022
日期:2009.10
The synthesis of new enantiopure polyfunctionalised diazepanone scaffolds is described. The key steps involve the opening of an azido-epoxide C4 building block derived from L-ascorbic or D-isoascorbic acid by a L-serine derivative followed by a lactonisation-lactamisation two-step sequence. (C) 2009 Elsevier Ltd. All rights reserved.