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.
在氯化锡或三甲基硅基三氟甲烷磺酸盐存在下,3, 4, 6-三-O-乙酰基-D-葡萄糖醇与三甲基硅基化的核苷碱基的缩合反应生成了2, 3-二脱氧-D-红糖-hex-2-烯吡喃糖核苷的异构体混合物。这些异构体的2-己烯吡喃糖核苷的圆二色性(CD)光谱符号与通常的核苷或葡萄糖吡喃糖核苷的符号相反。文中还展示了其他例子,说明核苷糖部分的不饱和键对CD光谱的贡献。