onic acid esters were coupled with a 1/1 mixture of alpha and beta 2,3 di-O-protected D-galactopyranosiduronic acid esters, the beta-anomer proved to be more reactive. Data from theoretical calculations suggested that the enhanced reactivity of this anomer compared with the alpha one would be due to a stronger hydrogen bond of the C-4 OH with the ring oxygen.
当将苯基三-O-苄基-
1-硫代-β-D-吡喃半乳糖醛酸酯化合物与1/1的α和β2,3二-O-保护的D-
吡喃
半乳糖醛酸酯化合物混合时,证明了β-端基异构体更具反应性。来自理论计算的数据表明,与α-1相比,该端基异构体的反应性增强是由于C-4 OH与环氧的氢键更强。