Syntheses of the methyl glycosides of curacin, a-b fragment found in avilamycin-a and -c, curamycin-a, flambamycin and everninomicin-2, and of its artificial regioisomer isocuracin
作者:Peter Jütten、Jürgen Dornhagen、Hans-Dieter Scharf
DOI:10.1016/s0040-4020(01)83453-0
日期:1987.1
The esterification of methyl 2,6-dideoxy- α-D-arabino-hexopyranoside (8) with 4-ben2yloxy-3,5-dichloro-2-hydroxy-6-methylbenzoic acid (13) in the presence of CBI/DBN afforded after methylation with diazomethane and hydrogenolytic debenzylation the methyl glycoside of isocuracin, the artificial regioisomer of curacin, 5. Derivatives of dichloroisoeverninic acid (10) decomposed under the reaction conditions
甲基4-O-二氯异戊烯基-α-D-阿拉伯糖基己吡喃糖苷,即姜黄素2的甲基糖苷,它是原霉素的发色AB末端,是通过将3-O-苄基-2,6-二双氧-在正丁基锂的帮助下,用4-苄氧基-3,5-二氯-2-甲氧基-6-甲基苯甲酰氯(12)合成α-D-阿拉伯糖基己吡喃糖苷(9),然后进行氢解脱苄基作用。在CBI / DBN存在下,将甲基2,6-二脱氧-α-D-阿拉伯-己吡喃糖苷(8)与4-苯甲酰氧基-3,5-二氯-2-羟基-6-甲基苯甲酸(13)进行酯化反应在用重氮甲烷甲基化并氢解脱苄基后,异姜黄素是姜黄素的人工区域异构体。5,在各种酯化方法的反应条件下,二氯异戊烯酸的衍生物(10)分解。