Nucleosides. CXLVIII. : Synthesis of 6-(β-D-Ribofuranosyl)picolinamide. : A Novel C-Nucleoside from D-Ribonolactone
作者:MAREK M. KABAT、KRZYSZTOF W. PANKIEWICZ、ELZBIETA SOCHACKA、KYOICHI A. WATANABE
DOI:10.1248/cpb.36.634
日期:1988.2.25
2-bromopyridine (6) by mesylation of the 1'-hydroxyl group of 2 followed by treatment with trifluoroacetic acid. In a similar manner, the α-isomer 7 was prepared from 3. The same pyridine-C-nucleosides, 6 and 7, were also synthesized from the commercially available D-ribonolactone in seven steps.The bromo function of 2 and 3 was converted into the carboxamide group to give 6-(2, 4 : 3, 5-di-O-benz
用2-溴-6-硫代吡啶处理2、4:3、5-二-O-亚苄基-D-醛-核糖(1),得到6-(2,4:3)的同分异构体和同分异构体的混合物,5-二-O-亚苄基-D-戊醇-1-基)-2-溴吡啶(分别为2和3)。对这些异构体进行色谱分离。通过2的1′-羟基的甲磺化,然后用三氟乙酸处理,将化合物2转化为6-(β-D-呋喃呋喃糖基)-2-溴吡啶(6)。用类似的方法,由3制备α-异构体7。七步也由市售D-核糖内酯合成了相同的吡啶-C-核苷6和7。将2和3的溴官能团转化进入羧酰胺基团,得到6-(2,4:3,5-二-O-亚苄基-D-戊糖醇-1-基)吡啶啉酰胺(10)及其同分异构体11。将10进行甲磺酸化,然后进行三氟乙酸处理,得到6-(β-D-呋喃呋喃糖基)吡啶甲酸酰胺(14)。对11的相似处理得到了α对应物15。