3,4,6-Tri-O-methyl-D-glucal, readily prepared from 3,4,6-tri-O-acetyl-D-glucal, undergoes lithiation at -78 degrees C in THF with t-BuLi to afford a vinyl carbanion, which can be trapped with electrophiles in moderate overall yields. The palladium coupling and Dotz-type reactions of these intermediates are also described. (c) 2006 Elsevier Ltd. All rights reserved.
3,4,6-Tri-O-methyl-D-glucal, readily prepared from 3,4,6-tri-O-acetyl-D-glucal, undergoes lithiation at -78 degrees C in THF with t-BuLi to afford a vinyl carbanion, which can be trapped with electrophiles in moderate overall yields. The palladium coupling and Dotz-type reactions of these intermediates are also described. (c) 2006 Elsevier Ltd. All rights reserved.