Reaction of thiamine analogues lacking the 5-hydroxyethyl group (6a-e) with diethyl benzoylphosphonate (7) was carried out. Comparison of reactivity in 4'-substituted thiamine analogues and those lacking the hydroxyethyl group suggests the presence of an interaction in the thiamine molecule between the pyrimidine ring and the hydroxyethyl group in an aprotic solvent. Reactivity at the 2 position (the active center in enzymatic decarboxylation) in 4'-substituted thiamine analogues may be affected by this interaction.
缺乏 5-羟乙基的
硫胺类似物(6a-e)与
苯甲酰膦酸二乙酯(7)发生了反应。比较 4'-取代的
硫胺素类似物和缺少羟乙基的
硫胺素类似物的反应性表明,在非烷基溶剂中,
硫胺素分子中的
嘧啶环和羟乙基之间存在相互作用。4'- 取代
硫胺类似物中 2 位(酶脱羧作用中的活性中心)的反应活性可能会受到这种相互作用的影响。