Furanosides and furanones bearing acrylate sidechains via palladium-mediated cyclizations of γ-Oxoallenes
作者:Robert D. Walkup、Michael D. Mosher
DOI:10.1016/0040-4020(93)80015-l
日期:1993.1
Treatment of 4,5-hexadienal with catalytic palladium(II) chloride and excess copper(II) chloride, methanol and carbon monoxide in the presence of an acid and a water scavenger resulted in a net acetalization-cyclization-methoxycarbonylation to form a novel methyl furanoside bearing a methyl acrylate sidechain. Treatment of 4,5-hexadienoic acid under the same conditions yields the corresponding furanone, and 3-(tert-butylidimethylsilyloxy)-4,5-hexadienal yields a methyl beta-3'-(tert-butyldimethylsilyloxy)-2'-deoxyribofuranoside bearing the acrylate sidechain, with high stereoselectivity. This methodology provides access to sidechain-branched ribofuranoside compounds.