Phosphonic-Acid Analogues of the N-Acetyl-2-deoxyneiiraniinic Acids: Synthesis and Inhibition ofVibrio cholerae Sialidase
作者:Kurt Wallimann、Andrea Vasella
DOI:10.1002/hlca.19900730523
日期:1990.8.8
N-cyclohexylisoproylamide and deprotection. The phosphonic acids 3 (Ki 5.5 10-5 M) and 4 (Ki 2.3.10−4M) are stronger inhibitors of Vibrio cholerae sialidase than the anomeric N-acetyl-2-deoxyneuraminic acids 5(Ki 2.3 10−3M) and 6. Both 3 and 4 inhibit the Vibrio cholerae sialidase, while only the carboxylic acid 5, possessing an equatorial COOH group is an inhibitor.
制备了膦酸3和4,以比较它们对霍乱弧菌唾液酸酶与相应的N-乙酰基-2-脱氧神经氨酸5和6之一的抑制活性。因此,氢化和甲基N-乙酰基-2,3-二脱氢-2- deoxyneuraminate的苄基化(1MeNeu2en5Ac; 7),得到充分O形苄苄基和甲基酯的混合物9和10,部分Ò -benzylated苄基和甲基酯11和12,以及完全被O和N苄基化的苄基和甲基酯13和14(方案1)。的酯交换9至10和水解10得到酸15。15与Pb(OAc)4的氧化脱羧得到α-和β-D-甘油-D-半乳糖乙酸酯16和17的1:9混合物。用P(OMe)3和Me 3 SiOTf进行17的膦酰化反应,得到膦酸酯18和19的1.3:1混合物,将其脱保护得到(4-acetamido-2,4-dideoxy-D-glycero-α-and β-D-半乳糖-章吡喃糖基)膦酸3和分别为4。酸6是通过叔丁酯23与N-环己基异丙