Preparation of fluorinated galactosyl nucleoside diphosphates to study the mechanism of the enzyme galactopyranose mutase
作者:Andrew Burton、Paul Wyatt、Geert-Jan Boons
DOI:10.1039/a701630a
日期:——
A novel latent→active phosphorylation strategy has
been employed
for the preparation of two fluorinated nucleoside diphosphates
(compounds I and II). The strategy is based on the isomerisation of
substituted allyl to vinyl glycosides which were subsequently
phosphorylated by treatment with dibenzyl hydrogen phosphate,
N-iodosuccinimide and a catalytic amount of trimethylsilyl
triflate. This methodology is very suitable for the preparation of
nucleoside diphosphates that have a modification in the saccharide
moiety since the allyl moiety serves first as an anomeric protecting
group, allowing for protecting-group manipulation and functionalisation
of the sugar ring, but after isomerisation to the corresponding vinyl
glycoside it acts as an anomeric leaving group. The 2-F and 4-F Gal-UDP
derivatives I and II do not inhibit the enzyme galactopyranose mutase in
the direction pyranose → furanose but both compounds
have been found to inhibit the reverse reaction.
采用了一种新颖的潜伏到活性磷酸化策略,用于制备两种氟化核苷二磷酸(化合物I和II)。该策略基于取代烯丙基向乙烯基糖苷的异构化,随后通过使用二苄基磷酸氢盐、N-碘代琥珀酰亚胺和催化量的三甲基硅基三氟甲磺酸酯进行磷酸化。这种方法非常适用于制备糖部分有修饰的核苷二磷酸,因为烯丙基部分首先作为异头保护基,允许进行保护基操作和糖环的功能化,但在异构化为相应的乙烯基糖苷后,它充当异头离去基团。2-氟和4-氟的Gal-UDP衍生物I和II不抑制酶半乳吡喃糖变位酶的吡喃糖向呋喃糖的方向转化,但这两种化合物已被发现能抑制逆向反应。