Efficient Synthesis ofS-Adenosyl-L-Homocysteine Natural Product Analogues and Their Use to Elucidate the Structural Determinant for Cofactor Binding of the DNA Methyltransferase M·HhaI
作者:Marc Pignot、Goran Pljevaljcic、Elmar Weinhold
DOI:10.1002/(sici)1099-0690(200002)2000:3<549::aid-ejoc549>3.0.co;2-7
日期:2000.2
good overall yields. Direct deprotection of the thionucleoside 8 delivered 5′-thio-5′-deoxyadenosine (18) in excellent yield. In addition, binding constants of these AdoHcy analogues and the DNA methyltransferase M·HhaI were determined in a fluorescence assay.
5'-Acetylthio-5'-deoxy-2',3'-O-isopropylideneadenosine (8) 由市售的 2',3'-O-isopropylideneadenosine (7) 和硫代乙酸在 Mitsunobu 条件下以几乎定量的产率直接制备. 原位裂解 8 的乙酰硫基官能团,然后与不同的烷基溴进行偶联,收率很高。获得的 5'-硫代核苷的脱保护产生 S-腺苷-L-高半胱氨酸类似物脱羧的 AdoHcy (11)、脱氨基的 AdoHcy (14) 和 5'-[3-(氰基)丙硫基]-5'-脱氧腺苷 (16)良好的整体收益率。硫代核苷 8 的直接脱保护以优异的产率提供 5'-thio-5'-deoxyadenosine (18)。此外,这些 AdoHcy 类似物和 DNA 甲基转移酶 M·HhaI 的结合常数在荧光测定中确定。