Aryl<i>C</i>-Glycosides from<i>O</i>-Glycosyltrichloroacetimidates and Phenol Derivatives with Trimethylsilyl Trifluoromethanesulfonate (TMSOTf) as the Catalyst
作者:Jürgen-Andreas Mahling、Richard R. Schmidt
DOI:10.1055/s-1993-25859
日期:——
The reaction of O-(2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl) trichloracetimidate (1), as glycosyl donor with phenol and naphthol derivatives 2a-d and 2f-h, as glycosyl acceptors, furnished in the presence of catalytic amounts of TMSOTf the corresponding o-hydroxyaryl C-β-D-glucopyranosides 3a-d, f-h regio- and stereoselectively. The less reactive 4-methoxyphenol (2e), α-naphthol (2i), the hydroxy substituted coumarines 2j, k and the flavone 21 afforded under these conditions O-glycosides 5e, i-l. Hydrogenolytic O-debenzylation of 3a,b,d afforded compounds 4a,b,d.
以 O-(2,3,4,6-四-O-苄基-δ-D-吡喃葡萄糖基)三氯乙酰亚胺 (1) 为糖基供体,以苯酚和萘酚衍生物 2a-d 和 2f-h 为糖基受体,在催化量 TMSOTf 的存在下,反应生成相应的邻羟基芳基 C-δ-D-吡喃葡萄糖苷 3a-d、f-h。在这些条件下,活性较低的 4-甲氧基苯酚(2e)、δ-萘酚(2i)、羟基取代的香豆素 2j、k 和黄酮 21 可生成 O-糖苷 5e、i-l。对 3a、b、d 进行氢解 O-脱苄基反应,可得到化合物 4a、b、d。