Enantioselective Syntheses of ?-Amino Acids from 10-(Aminosulfonyl)-2-bornyl Esters and Di(tert-butyl) Azodicarboxylate. Preliminary Communication
作者:Wolfgang Oppolzer、Robert Moretti
DOI:10.1002/hlca.19860690819
日期:1986.12.10
Succesive treatment of chiral esters 1 with LiN(i-Pr)2/Me3SiCl and di(tert-butyl) azodicarboxylate/TiCl4/Ti(i-PrO)4 gave N,N′ -di[(tert-butoxy)carbonyl]hydrazino esters 9 which on deacylation, hydrogenolysis, transesterification, and acidic hydrolysis furnished (2S)-α-amino acids 6 in high enantiomeric purity with efficient recovery of the auxiliary alcohol 7.
The present invention relates to novel compounds of formula (I) or formula (Ia)
pharmaceutically-acceptable salts, hydrates, solvates, or stereoisomers thereof, and pharmaceutical compositions of these compounds which are useful for preventive and therapeutic use in human and veterinary medicine.
The present invention relates to novel compounds of formula (I) or formula (Ia)
pharmaceutically-acceptable salts, hydrates, solvates, or stereoisomers thereof, and pharmaceutical compositions of these compounds which are useful for preventive and therapeutic use in human and veterinary medicine.