Synthesis of (R)-2-methyl-4-deoxy and (R)-2-methyl-4,5-dideoxy analogues of 6-phosphogluconate as potential inhibitors of 6-phosphogluconate dehydrogenaseElectronic supplementary information (ESI) available: experimental procedure and spectroscopic data (1H NMR, 13C NMR, DEPT) for compounds 2, 12, 13, 14, 15 and 21b and the previous synthetic approach tried for the synthesis of (2R)-2-methyl-4,5-dideoxy analogues. See http://www.rsc.org/suppdata/ob/b2/b210606j/
作者:Christophe Dardonville、Ian H. Gilbert
DOI:10.1039/b210606j
日期:2003.1.30
The synthesis of (2R)-2-methyl-4,5-dideoxy and (2R)-2-methyl-4-deoxy analogues of 6-phosphogluconate is described. The synthetic strategy relies on the Evans aldol reaction for the installation of the chiral centres in the 2- and 3-positions. The selective phosphorylation at the primary alcohol function of (2R,3S)-3,6-dihydroxy-2-methylhexanoic acid benzyl ester (5) and (2R,3S,5S)-3,5,6-trihydroxy-2-methylhexanoic acid benzyl ester (20) was achieved with dibenzyl phosphochloridate and dibenzyl phosphoiodinate respectively, working at low temperature. (2R,3S)-3-Hydroxy-2-methyl-6-phosphonoxyhexanoic acid (9) was obtained in 25% overall yield from 4-benzyloxybutanol and (2R,3S,5S)-3,5-dihydroxy-2-methyl-6-phosphonoxyhexanoic acid (28) in 10% overall yield from L-malic acid.
描述了(2R)-2-甲基-4,5-脱氧和(2R)-2-甲基-4-脱氧的6-磷酸葡萄糖酸类的合成。合成策略依赖于Evans醛醇反应,以在2位和3位安装手性中心。在(2R,3S)-3,6-二羟基-2-甲基己酸苄酯(5)和(2R,3S,5S)-3,5,6-三羟基-2-甲基己酸苄酯(20)的初级醇功能上进行了选择性磷酸化,分别使用二苄基磷酸氯化物和二苄基磷酸碘化物,在低温下进行反应。(2R,3S)-3-羟基-2-甲基-6-磷酸氧基己酸(9)的总体产率为25%,来自4-苄氧基丁醇;而(2R,3S,5S)-3,5-二羟基-2-甲基-6-磷酸氧基己酸(28)的总体产率为10%,来源于L-苹果酸。