presence of a Lewis acid (SnCl4, BF3) as catalyst to give anomeric pairs of 2,3-dideoxy-hex-2-enopyranosyl cyanides and 3-deoxy-hex-2-enopyranosyl cyanides. These 2,3-unsaturated glycopyranosyl cyanides were hydrogenated over to afford the corresponding 2,3-dideoxy- and 3-deoxy-hexopyranosyl cyanides.
在
路易斯酸存在下,3,4,6-Tri-O-乙酰基-O-
葡糖和2,3,4,6-四-O-乙酰基-2-羟基-
D-葡糖与Me 3 SiCN反应(以SnCl 4,BF 3)为催化剂,得到2,3-二脱氧-己-2--2-
吡喃糖基
氰化物和3-脱氧-己-2--2-
吡喃糖基
氰化物的端基对。将这些2,3-不饱和的
吡喃
葡萄糖基
氰化物氢化,得到相应的2,3-二脱氧-和3-脱氧-己基
吡喃糖基
氰化物。