CHEMO-ENZYMATIC SYNTHESIS OF ALL ISOMERIC 3-PHENYLSERINES AND -ISOSERINES
The synthesis of all isomers of 3-phenylserines and 3-phenylisoserines in enantiomerically pure form is presented.Diastereomerically pure educts (threo/erythro-2-azido-3-butanoyloxy-3-phenyl-propionic esters, threo/erythro-3-azido-2-butanoyloxy-3-phenylpropionic esters, threo-2-butanoylamino-3-butanoyloxy-3-phenylpropionic ester, erythro-3-butanoylamino-2-butanoyloxy-3-phenyl-propionamide) were prepared from cinnamic acid derivatives or via aldol condensations of benzaldehyde and suitable enolates in few steps.These racemates were resolved with lipases from Candida cylindracea (CC) and Pseudomonas fluorescens (P) and the obtained products were hydrogenated to 3-phenylserines and -isoserines.The influence of the acyl group in the enzymatic resolution of erythro-3-azido-2-acyloxy-3-phenylpropionic esters was investigated.
Hoenig, H.,Seufer-Wasserthal, P.,Weber, H.
p. 3841 - 3850
(2007/10/02)
Simultaneous separation of enantiomers of diastereomers by lipases
Enantiomerically and diastereomcrically pure 3-azido-2-hydroxy-3-phenyl propanoates are obtained from a mixture of racemic threo- and erythro-3-azido-2-butanoyloxy-3-phenyl propanoates by asymmetric hydrolysis with lipases.
Hoenig,Seufer-Wasserthal,Weber
p. 3011 - 3012
(2007/10/02)
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