Synthesis of N-acylated 7-amino-2,6,7-trideoxy-d-erythroheptopyranosides from methyl α-d-mannoside
作者:Kathrin Wiedemeyer、Bernhard Wünsch
DOI:10.1016/j.carres.2005.08.008
日期:2005.11
step is the radical cleavage of benzylidene derivative 10 to obtain bromide 11. Since nucleophilic substitution of 11 with KCN provided the bicyclic nitrile 13 instead of nitrile 14, ketone 11 was protected as the dimethyl acetal 15. Nucleophilic substitution of 15 with KCN, subsequent hydrogenation with H2/Raney Ni and acylation with various carboxylic acid derivatives yielded 7-(acylamino)heptopyranosides
将己吡喃糖苷甲基α-D-甘露糖苷(8)同源化,得到7-(酰氨基)-2,6,7-三苯氧基-庚吡喃糖苷19-26。关键的反应步骤是将亚苄基衍生物10自由基裂解以获得溴化物11。由于用KCN亲核取代11可提供双环腈13而不是腈14,因此酮11被保护为二甲基乙缩醛15。 ,随后用H 2 /阮内镍氢化并用各种羧酸衍生物酰化,得到7-(酰基氨基)七吡喃糖苷19-22。