作者:Bettina V. Ernholt、Ib B. Thomsen、Anders Lohse、Igor W. Plesner、Kenneth B. Jensen、Rita G. Hazell、Xifu Liang、Astrid Jakobsen、Mikael Bols
DOI:10.1002/(sici)1521-3765(20000117)6:2<278::aid-chem278>3.0.co;2-6
日期:2000.1.17
L-xylose was converted to (-)-1-azafagomine ((-)-1). Enzymatic and other routes to optically pure 1-azafagomine were also studied. Compound (-)-1 is a potent competitive glycosidase inhibitor, while (+)-1 has no biological activity. The inhibition of almond beta-glucosidase by (-)-1 was found to be slow owing to a slow binding step of inhibitor to enzyme, with no subsequent conformational rearrangement
糖苷酶抑制剂1-azafagomine的两种对映体形式首次从D-和L-木糖开始合成。将D-木糖转化为2,3,5-三苄基呋喃糖,将其与氨基甲酸叔丁酯还原胺化后,可以高收率得到被保护的1-肼基-1-脱氧戊糖醇。N-乙酰化,4-OH的甲磺酸化,Boc基团的去除,环化和脱保护得到(+)-1-azafagomine((+)-1)。通过类似的反应序列,L-木糖被转化为(-)-1-氮杂花胺((-)-1)。还研究了通过酶促途径和其他途径获得光学纯的1-氮杂谷氨酰胺。化合物(-)-1是有效的竞争性糖苷酶抑制剂,而(+)-1没有生物活性。由于抑制剂与酶的结合步骤缓慢,因此发现(-)-1对杏仁β-葡萄糖苷酶的抑制作用较慢,没有随后的构象重排。发现结合和释放的速率常数分别为3.3 x 10(4)M(-1)s(-1)和0.011 s(-1),产生Ki = 0.33 microM。