The Use of Grignard Reagents in the Synthesis of Carbohydrates. I. The Synthesis of Deoxy and Branched-chain Deoxy Sugars
作者:Masajiro Kawana、Sakae Emoto
DOI:10.1246/bcsj.53.222
日期:1980.1
Two branched-chain deoxy sugars, methyl 5,6-O-cyclohexylidene-3-deoxy-2-C-methyl-β-D-arabino-hexofuranoside and its α-D-ribo isomer, were easily prepared by the one-step reaction of methyl 5,6-O-cyclohexylidene-3-O-mesyl-β-D-allofuranoside (3a) with methylmagnesium iodide. Similarly, the corresponding α-mesylate (4a) gave methyl 5,6-O-cyclohexylidene-3-deoxy-2-C-methyl-α-D-ribo-hexofuranoside. It was
两种支链脱氧糖,甲基 5,6-O-cyclohexylidene-3-deoxy-2-C-methyl-β-D-arabino-hexofuranoside 及其 α-D-ribo 异构体,可以通过一步轻松制备甲基 5,6-O-cyclohexylidene-3-O-mesyl-β-D-allofuranoside (3a) 与甲基碘化镁的反应。类似地,相应的 α-甲磺酸酯 (4a) 得到 5,6-O-cyclohexylidene-3-deoxy-2-C-methyl-α-D-ribo-hexofuranoside 甲酯。已证明这些反应涉及 1,2-氢化物转移。3a 和 4a 与叔丁基溴化镁的反应分别产生两种脱氧糖,甲基 5,6-O-cyclohexylidene-3-deoxy-β-D-arabino-hexofuranoside 和相应的 α-D-ribo 异构体。在与格氏试剂的某些反应条件下,磺酸盐