Crystalline product obtained by the reaction of potassium ethylxanthate upon an anomeric mixture of 2, 3, 4-tri-O-acetyl-D-ribopyranosyl bromides or that of 2, 3, 4, 6-tetra-O-acetyl-D-mannopyranosyl bromides in anhydrous acetone was confirmed to be one anomer of 2, 3, 4-tri-O-acetyl-D-ribopyranosyl ethylxanthates or that of 2, 3, 4, 6-tetra-O-acetyl-D-mannopyranosyl ethylxanthates, respectively. Their anomeric configurations at carbon 1 were assumed to be β. Three derivatives of 1-thio-β-D-ribopyranose and four derivatives of 1-thio-β-D-mannopyranose were synthesized in crystalline forms from acetylated glycosyl ethylxanthates mentioned above.
乙基黄原酸钾与2,3,4-三-O-乙酰基-
D-吡喃核糖基
溴化物或2,3,4,6-四-O-乙酰基-D-
吡喃
甘露糖基异构体混合物反应得到的结晶产物无
水丙酮中的
溴化物被证实分别是2,3,4-三-O-乙酰基-
D-吡喃核糖基乙基黄原酸酯或2,3,4,6-四-O-乙酰基-D-
吡喃
甘露糖基乙基黄原酸酯的一种异头物。它们在碳 1 处的异头构型被假定为 β。由上述乙酰化糖基乙基黄原酸酯以结晶形式合成了三种1-
硫代-β-
D-吡喃核糖衍
生物和四种1-
硫代-β-D-
吡喃
甘露糖衍
生物。