The microwave-assisted heating reaction of N-acetyl glucosamine (GlcNAc) in sulfolane is described. The reaction produces two major products that are assignable to 1,6-anhydro-2-acetamido-2-deoxy-β-d-glucopyranose (AGPNAc) and 1,6-anhydro-2-acetamido-2-deoxy-β-d-glucofuranose (AGFNAc). In order to reveal a general feature of the system, the 3, 5, and 10 min reactions were performed at 140, 160, 180, 200, and 220 °C to clarify the time course changes in the conversion of GlcNAc and the yields of the two produced 1,6-anhydrosugars. Temperature is a crucial factor that significantly affects the conversion of GlcNAc. The yields of AGPNAc and AGFNAc are also drastically changed depending on the reaction conditions. The 5-min reaction at 200 °C is shown to be the optimal condition to generate the 1,6-anhydrosugars with a high efficiency in which AGPNAc and AGFNAc are produced in the yields of 21% and 44%, respectively. Consequently, the microwave-assisted heating reaction of GlcNAc in sulfolane is shown to be a simple and promising pathway to generate 1,6-anhydrosugars consisting of amino monosaccharide backbones, which have high potentials as raw materials leading to biological oligosaccharides and biomimetic polysaccharides.
本文描述了在苏氧化物中使用微波辅助加热反应N-乙酰葡萄糖胺(GlcNAc)的过程。该反应生成两种主要产物,可归属于1,6-脱水-2-乙酰胺基-2-脱氧-β-d-葡萄糖吡喃糖(AGPNAc)和1,6-脱水-2-乙酰胺基-2-脱氧-β-d-葡萄糖呋喃糖(AGFNAc)。为了揭示系统的一般特征,对140、160、180、200和220℃下的3、5和10分钟反应进行了实验,以澄清GlcNAc转化和产生的两种1,6-脱水糖的产率的时间变化。温度是一个重要因素,显著影响GlcNAc的转化。AGPNAc和AGFNAc的产率也会根据反应条件的不同而发生显著变化。在200℃下进行5分钟反应被证明是生成1,6-脱水糖的最佳条件,其中AGPNAc和AGFNAc的产率分别为21%和44%。因此,GlcNAc在苏氧化物中的微波辅助加热反应被证明是生成由氨基单糖骨架组成的1,6-脱水糖的简单且有前途的途径,这些糖具有作为生物寡糖和仿生多糖的原材料的高潜力。