A simple procedure for the synthesis of the methyl and benzyl glycosides of Neu5Ac and 4-epi-Neu5Ac. Conversion of the benzyl and methyl glycosides of Neu5Ac into N-trifluoroacetylneuraminic acid benzyl glycosides
作者:Nargiz E Byramova、Alexander B Tuzikov、Nicolai V Bovin
DOI:10.1016/s0008-6215(92)84240-s
日期:1992.12
-mixture of the methyl glycosides ( 13 and 14 ). Likewise, with benzyl alcohol, 5 gave a 63:32 α,β -mixture of the benzyl glycosides ( 17 and 18 ). Treatment of methyl (5-acetamido-4,7,8,9-tetra- O -acetyl-3,5-dideoxy- β - d - glycero -pd- talo -2-nonulopyranosyl bromide)onate ( 7 ) with an excess of benzyl alcohol gave a 3:1 α,β -mixture of the benzyl glycosides ( 21 and 22 ) together with methyl 5-acetamido-4
摘要从Kuhn-Bashang合成Neu5Ac的反应产物中,得到5-乙酰氨基-3,5-二脱氧-α-和-β-d-甘油-d-talo -2-壬基吡喃磺酸(4- Epi -Neu5Ac)。分离为乙酰化甲酯(1和2)。用过量的甲醇处理(5-乙酰氨基-4,7,8,9-四-O-乙酰基-3,5-二脱氧-d-甘油-d-半乳糖-2-壬基吡喃糖基溴化)膦酸酯(5)得到高产率的甲基糖苷(13和14)的9:1α,β-混合物。同样,用苄醇5得到苄基糖苷(17和18)的63∶32的α,β-混合物。过量处理(5-乙酰氨基-4,7,8,9-四-O-乙酰基-3,5-二脱氧-β-d-甘油-pd-talo-2-壬基吡喃糖基溴化)膦酸酯(7)苯甲醇生成3:1的α,β-苄基糖苷(21和22)与甲基5-乙酰氨基-4,7,8的混合物,9-四-O-乙酰基-2,6-脱水-3,5-二脱氧-d-甘油-d-talo-非-2-烯酸酯(9)。在碳酸