Stereoselective synthesis of the α-glucosidase inhibitor nectrisine
摘要:
The alpha-glucosidase inhibitor nectrisine was synthesised in 12 steps (31%, overall yield) starting from D-serine. The three contiguous stereocentres of this iminosugar were introduced via a highly diastereoselective boron mediated glycolate aldol reaction. (C) 2003 Elsevier Ltd. All rights reserved.
The synthesis of new sugar-derived phosphonic acids from protected nectrisine is described. The key step is a highly stereoselective addition of a phosphonate anion to a sugar-derived dihydropyrrole to provide a versatile synthetic intermediate which can be functionalised in multiple ways.
The structure of a novel immunomodulator, nectrisine (1), has been elucidated on the basis of chemical and spectroscopic evidence. Its absolute stereochemistry was predicted on the basis of the dibenzoate chirality rule and finally confirmed by a synthesis from D-glucose.
Nucleophilic Additions to Cyclic Nitrones en Route to Iminocyclitols – Total Syntheses of DMDP, 6-deoxy-DMDP, DAB-1, CYB-3, Nectrisine, and Radicamine B
with total diastereoselectivity and in quantitative yield, with no purification being necessary. By this strategy, 2-(hydroxymethyl)-, 2-(aminomethyl)-, and 2-aryl-substituted polyhydroxylated pyrrolidines have been prepared with abundant configurational diversity. The use of appropriate substrates and reagents allowed for approaches to DMDP, 6-deoxy-DMDP, DAB-1, CYB-3, nectrisine and radicamine B. Several
An efficient and novel process is described for the synthesis of nectrisine 5 and its related derivatives 6,7 as potent glucosidase inhibitors via the corresponding lactams starting from D-(−)-diethyl tartrate. Also the results of biological evaluation of the synthesized compounds are described.