Stereoselective synthesis of C-glycosylphosphonates from their ketols. Reconsideration of an abandoned route
摘要:
Isosteric phosphonate analogues of glycosyl 1-phosphates have been obtained by addition of LiCH2P(O)(OMe)(2) to glyconolactones followed by Et3SiH-TMSOTf reductive dehydroxylation of the resultant ketols. The compounds prepared include four beta-linked pyranose derivatives (D-galacto, 2-azido-2-deoxy-D-galacto, D-gluco, D-manno) and one beta-linked furanose derivative (D-manno). In the latter case the ketol was activated as its 2-acetate. In agreement with an observation in another laboratory, the dehydroxylation of a model ketol phosphonate failed with the use of Et3SiH-BF3. Et2O. (C) 2000 Elsevier Science Ltd. All rights reserved.
Synthesis of Spirocyclic Cyclopropyl Glycosyl-1-phosphate Analogues
作者:Jun Cao、Stéphane P. Vincent
DOI:10.1021/acs.orglett.2c01422
日期:2022.6.17
A general methodology allowing the preparation of phosphonylated 1-spirocyclopropyl analogues of glycosyl-1-phosphates is reported. The scope of this reaction has been assessed using various exo-glycals easily obtained from the corresponding pyranoses and furanoses. The cyclopropanation was found to be stereospecific, and the cis/trans selectivity only depends on the E/Z configuration of the starting