Stereoselective syntheses of C-(d-glucopyranosyl)alkenes
作者:Derek Horton、Toshiaki Miyake
DOI:10.1016/0008-6215(88)80020-x
日期:1988.12
D-glucopyranosyl)-1-propene (4) by treatment with allyltrimethylsilane and borontrifluorideetherate in acetonitrile. Similar treatment of methyl tetra-O-acetyl-alpha-D-glucopyranoside or tetra-O-acetyl-alpha-D-glucopyranosyl bromide also gave 4 in preference to its beta anomer, but net yields were lower. Similar reaction of 1 with (E)-penta-2,4-dienyltrimethylsilane afforded the readily polymerizable
C-disaccharide analogs of trehalose were prepared using an aqueous Diels-Alder reaction as a key step. The resulting major stereoisomer was shown by NMR spectroscopy analysis to have the correct (alpha, alpha') stereochemistry of trehalose. (C) 1997 Elsevier Science Ltd.