Methanolysis and aminolysis of N-acetylmuramic acid lactones: Evidence for the retention of the d-gluco configuration
作者:Dina Keglević、Mario Pongračić
DOI:10.1016/0008-6215(84)85007-7
日期:1984.12
α-glycosides of N-acetylmuramic acid lactones with HO-6 free (2) and substituted (4, 7, 10, and 12) is catalysed by small amounts of silica gel to give, exclusively, the corresponding methyl esters with HO-4 unsubstituted (3, 5, 8, 11, 13); opening of the lactone ring proceeds with retention of the d -gluco configuration and can be followed by 1H-n.m.r. spectroscopy. Condensation of 2 with 2-methyl-(3,4,6-tri-O-acetyl-1
摘要少量硅胶催化HO 2游离(2)取代(4、7、10和12)的N-乙酰基山梨酸内酯的苄基α-糖苷的甲醇分解,仅产生相应的甲酯带有未取代的HO-4(3、5、8、11、13);内酯环的打开继续保持d-葡萄糖构型,并且可以随后进行1 H-nmr光谱。2与2-甲基-(3,4,6-三-O-乙酰基-1,2-二脱氧-α-d-吡喃吡喃)-[2,1-d] -2-恶唑啉的缩合反应(15) β-(1→6)-连接的二糖内酯16,在甲醇分解作用下,生成二糖甲基酯17,也通过3和15的缩合获得。在咪唑的存在下,内酯2和4进行氨基酸和氨基酸的氨解。肽酯作为亲核试剂可产生19-24的N-乙酰基村酰胺衍生物。