A Practical Stereoselective Synthesis of both Enantiomers of Threo- and Erythro-β-Hydroxy Norvaline from (S)-Serine Derivatives
摘要:
The four enantiopure diastereoisomers of beta-hydroxy norvaline have been prepared from L-serine in moderate chemical yield. The method is based on the diastereoselective addition of different organometallics to easily accessible serinal derivatives. (C) 2000 Elsevier Science Ltd. All rights reserved.
A Practical Stereoselective Synthesis of both Enantiomers of Threo- and Erythro-β-Hydroxy Norvaline from (S)-Serine Derivatives
摘要:
The four enantiopure diastereoisomers of beta-hydroxy norvaline have been prepared from L-serine in moderate chemical yield. The method is based on the diastereoselective addition of different organometallics to easily accessible serinal derivatives. (C) 2000 Elsevier Science Ltd. All rights reserved.
The invention relates to compounds of the formula I
wherein
R, R
1
, R
2
, R
3
, X, and
n are defined in the specification. The invention also provides pharmaceutically suitable acid addition salts thereof and all forms of optically pure enantiomers, recemates or diastereomers and diastereomeric mixtures thereof. Compounds of the invention are useful for the treatment of Alzheimer's disease.