作者:Melville L. Wolfrom、Shigeharu Inouye
DOI:10.1016/s0008-6215(00)87012-3
日期:1975.5
Ethyl 2-amino-2-deoxy-1-thio-alpha- and -beta-D-arabinopyranoside (2 and 4) were obtained by direct ethanethiolation of 2-amino-2-deoxy-D-arabinose (1), and their structures were determined by mass and p.m.r. spectrometry. Ethyl 2-amino-2-deoxy-1-thio-alpha- and -beta-D-arabinofuranoside (11 and 13) were prepared by partial demercaptalation of 2-amino-2-deoxy-D-arabinose diethyl dithioacetal (6) with
通过2-氨基-2-脱氧-D-阿拉伯糖(1)的直接乙硫基化反应获得2-氨基-2-脱氧-1-硫代-α-和-β-D-阿拉伯吡喃糖苷(2和4)。通过质谱和pmr光谱测定结构。通过将2-氨基-2-脱氧-D-阿拉伯糖二乙基二硫缩醛(6)部分脱巯基化制备乙基2-氨基-2-脱氧-1-硫代α-和β-D-阿拉伯呋喃糖苷(11和13)。氯化汞(或优选含溴的氯化汞),带有或不带有5-羟基保护基。用氯化汞去巯基化几乎只得到了β-D端基异构体,用溴处理得到的α和β端基异构体的混合物的比例接近1:1。或者,在三氟乙酸中直接进行乙硫醇化反应,得到α-D异构体。11和13的结构是通过质谱测定的,通过将它们的N-乙酰基衍生物与真正的对映体(15b)直接比较,并通过pmr光谱分析。比较了四种1-硫代糖苷(2、4、11和13)的物理化学性质与D-阿拉伯糖的O-糖苷的理化性质。