Synthesis of 2-methyl-[2-acetamido-4-O-acetyl-6-O-benzyl-3 O-(2-butenyl)-1,2-dideoxy-α-d-glucopyrano]-[2,1-d]-2-oxazoline a versatile intermediate for the synthesis of complex oligosaccharides of bacterial cell-wall, human milk, and blood-group substances
作者:Philippe L. Durettet、Eric P. Meitzner
DOI:10.1016/s0008-6215(00)85253-2
日期:1981.3
2-Methyl-[2-acetamido-4-O-acetyl-6-O-benzyl-3-O-(2-butenyl)-1,2-dideoxy-alpha-D-glucopyrano]-[2,1-d]-2-oxazoline (2), a glycosylating agent in which the three hydroxyl groups are blocked with protecting groups of differing "persistence", is of utility in the synthesis of oligosaccharides containing highly branched 2-acetamido-2-deoxy-D-glucosyl residues, and it was synthesized in a ten-step sequence
2-甲基-[2-乙酰氨基-4-O-乙酰基-6-O-苄基-3-O-(2-丁烯基)-1,2-二脱氧-α-D-吡喃吡喃]-[2,1-d ] -2-恶唑啉(2)是一种糖基化剂,其中三个羟基被不同的“持久性”保护基团封闭,可用于合成含有高度支化的2-乙酰氨基-2-脱氧-D-的寡糖糖基残基,然后通过10个步骤由2-乙酰氨基-2-脱氧-D-葡萄糖经由烯丙基2-乙酰氨基-4,6-O-亚苄基-2-脱氧-β-D-吡喃葡萄糖苷合成(3 )。用2-丁烯基(巴豆基)溴进行烷基化,亚苄基乙缩醛的水解,6-羟基的苄基化和4-羟基的乙酰化,得到烯丙基2-乙酰氨基-4-O-乙酰基-6-O -苄基-3-O-(2-丁烯基)-2-脱氧β-D-吡喃葡萄糖苷(10)。用氯代三(三苯基膦)铑(I)处理10,主要得到相应的1-丙烯基β-糖苷,其通过在乙腈中的氯化汞-氧化汞的作用将其转化为恶唑啉2。苄基2-乙酰氨基-3,6-二-O-苄基-