Muramyl Peptides, 1 Stereochemically Pure Derivatives of Muramic and Isomuramic Acids
作者:Paul H. Gross、Manfred Rimpler
DOI:10.1002/jlac.198619860104
日期:1986.1.14
of their methyl esters (4r and 4s). The high yield and complete separation of 4r and 4s allow a reliable assessment of the low stereoselectivity of the lactyl ether synthesis step from racemic 2-chloropropionic acid. Similarly, syntheses employing pure enantiomers of 2-chloropropionic acid were disclosed as not completely stereospecific. Coupling products with L- and D-alanine esters were prepared for
一种改进的,大规模制备描述,由2-乙酰氨基-2-脱氧- d-葡萄糖导致苄基2-乙酰氨基-4,6- ø -亚苄基-3- ö - [(R)-1-羧乙基] -2-脱氧α-d-D-吡喃葡萄糖苷(α-苄ñ -乙酰基-4,6- ö -benzylidenemuramic酸。5R)和它的(小号) -异构体(α-苄ñ -乙酰基-4,6- ø -亚苄基isomuramic酸,5S)通过它们的甲酯(色谱分离4R和4S)。4r和4s的高产量和完全分离可以可靠地评估由外消旋2-氯丙酸合成的乳酸醚合成步骤的立体选择性低。类似地,公开了使用2-氯丙酸的纯对映异构体的合成不是完全立体特异性的。制备了5r和5s的具有L-和D-丙氨酸酯的偶联产物。