Synthesis of 3-azido-2,3,6-trideoxy-β-<scp>d</scp>-arabino-hexopyranosyl pyranonaphthoquinone analogues of medermycin
作者:Margaret A. Brimble、Roger M. Davey、Malcolm D. McLeod、Maureen Murphy
DOI:10.1039/b301449p
日期:——
6-(4-O-acetyl-3-azido-2,3,6-trideoxy-beta-D-arabino- hexopyranosyl)-5-methoxy-1,4-naphthoquinone 22 to naphthol 23 followed by selective ortho bromination to bromide 24 and methylation to 16. Attempts to effect acetylation of 6-(4-O-acetyl-3-azido-2,3,6-trideoxy-beta-D-arabino- hexopyranosyl)-3-bromo-1,4,5-trimethoxynaphthalene 16 and 3-bromo-6-(3-dimethylamino-2,3,6-trideoxy-beta-D-arabino- hexopyranosyl)-1,4,5-t
描述了C-糖基吡喃并萘甲醌抗生素美德霉素的4-O-乙酰基-3-叠氮基2,3,6-三苯氧基-β-D-阿拉伯-己吡喃糖基类似物6的异构体混合物的合成。通过Stille制备了关键的3-乙酰基-6-(4-O-乙酰基-3-叠氮基-2,3,6-三苯氧基-β-D-阿拉伯糖基-己吡喃糖基)-5-甲氧基-1,4-萘醌8。 -(3-叠氮基-2,3,6-三苯氧基-β-D-阿拉伯糖基-己吡喃糖基)-3-溴-1,4-萘醌17与(α-乙氧基乙烯基)三丁基锡烷的偶联,然后水解和氧化通过对6-(4-O-乙酰基-3-叠氮基-2,3,6-三苯氧基-β-D-阿拉伯糖基-己基吡喃糖基)-3-溴-的氧化脱甲基作用而得到溴萘醌17。 1,4,5-三甲氧基萘16是由6-(4-乙酰基-3-叠氮基2,3,6-三苯氧基-β-D-阿拉伯-己吡喃糖基)-1,4,5-三甲氧基萘10的区域选择性溴化而形成的。后者的萘10是通过使用乙腈中的BF 3·Et