diastereoisomer transformation (CIDT) of naphthoxazines derived from racemic O-protected 2-substituted 4-hydroxybutyraldehydes and enantiopure Betti's base allows the deracemization of the starting aldehydes with ee up to 96%. As an alternative, reduction with lithium aluminum hydride of the diastereoisomerically enriched naphthoxazines leads to enantioenriched primary amines. The utility of the latter strategy
Enantioselective synthesis of (R)- and (S)-2-alkyl-1,4-butanediolsvia enantiomerically pure 3-alkyl-5-(menthyloxy)butyrolactones
作者:Namkyu Lee、Young-Woo Kim、Kieyoung Chang、Key H. Kim、Sang-Sup Jew、Dae-Kee Kim
DOI:10.1016/0040-4039(96)00310-3
日期:1996.4
A general and practical symthesis of optically pure (R)- and (S)-2-ethyl, 2-propyl and 2-isopropyl-1,4-butanediols, 9a-c, has been accomplished from optically pure 5-(menthyloxy)butenolides in five steps in good yields.
The present invention relates to a compound of the Formula (I)):
or pharmaceutically acceptable salt thereof, wherein the symbols are as defined in the specification; a pharmaceutical composition comprising the same, a method for treating or preventing viral infections, inflammation, dry eye, central nervous disorders, cardiovascular diseases, cancer, obesity, diabetes, muscular dystrophy, and hair loss.