Inspired by polyhydroxylated pyrrolidine alkaloid natural products, a 18-membered library of 2-aryl polyhydroxylated pyrrolidines has been efficiently prepared in two or three synthetic steps from the known chiral cyclic nitrones with high yield and purity and excellent stereoselectivity. The inhibitory activity of all these compounds against various glycosidase enzymes was evaluated. Interestingly, 15 and 19 show better inhibitory activities than radicamine A ( 20) and B ( 18) against alpha-glucosidases. The IC50 values of 15 and 19 are 1.1 and 0.5 mu M, respectively. In this study, we also discovered the substituent(s) on the aryl ring could affect the inhibition potency and selectivity against glycosidases. (C) 2008 Elsevier Ltd. All rights reserved.
Radicamines A and B: Synthesis and Revision of the Absolute Configuration
作者:Chu-Yi Yu、Mu-Hua Huang
DOI:10.1021/ol0609210
日期:2006.7.1
[reaction: see text] Starting from D-xylose, enantioselective syntheses of 1 and 2, the proposed structures for radicamines A and B, were accomplished. Both (1)H and (13)C NMR spectra of 1 and 2 were identical with those of the natural products, but the optical rotation measurements identified that 1 and 2 were actually the enantiomers of the natural radicamines A and B, respectively.