Modified 3-Hydroxypipecolic Acid Derivatives as an Organocatalyst
摘要:
Novel 3-hydroxypipecolic acid derivatives were synthesized from glycine by using the method we developed previously. Among the 3-hydroxypipecolic acid derivatives obtained, a 2,3-trans-3-O-TBDPS-4,5-didehydro derivative showed the most promising result as an asymmetric catalyst in the Mannich reaction of ethyl 4-(methoxyphenylimino)acetate and n-hexylaldehyde.
Synthesis of both enantiomers of hydroxypipecolic acid derivatives equivalent to 5-azapyranuronic acids and evaluation of their inhibitory activities against glycosidases
kinetic resolution, the synthesis of both L- and D-isomers of 3,4,5-trihydroxy- and 3-hydroxypipecolic acids was achieved. None of the compounds tested showed inhibitory activity against alpha- and beta-glucosidases. On the other hand, L-23 and L-29 were found to have potent inhibitory activity against beta-glucuronidase. In addition, it is interesting that some uronic-type azasugar derivatives showed moderate
A highly practicable synthesis of both enantiomers of 3-hydroxypipecolic acid derivatives 1, 2, 3, 4 is described. Screening of these molecules for glycosidase inhibition has been examined. Compound 3 was shown to be a potent inhibitor of beta-N-acetylglucosaminidase as well as Escherichia coli beta-glucuronidase. (C) 2008 Elsevier Ltd. All rights reserved.