Nucleosides and nucleotides. LXII. Synthesis and optical properties of 2,3-dideoxy-D-erythro-hex-2-enopyranosyl nucleosides.
作者:TOHRU UEDA、SHINICHI WATANABE
DOI:10.1248/cpb.33.3689
日期:——
Condensation of 3, 4, 6-tri-O-acetyl-D-glucal and trimethylsilylated nucleobases in the presence of stannic chloride or trimethylsilyl trifluoromethanesulfonate gave anomeric mixtures of 2, 3-dideoxy-D-erythro-hex-2-enopyranosyl nucleosides. The signs of the circular dichroism (CD) spectra of the anomeric 2-hexenopyranosyl nucleosides are opposite to those of usual nucleosides or glucopyranosyl nucleosides. Other examples illustrating the contribution of an unsaturated bond in the sugar portion of nucleosides to the CD spectra are also presented.