A simple oxidation of formycin to oxoformycin and oxoformycin B. Synthesis of 6-methyloxoformycin, A<i>C</i>-nucleoside analog of doridosine
作者:Bheemarao G. Ugarkar、Ganapathi R. Revankar、Roland K. Robins
DOI:10.1002/jhet.5570210656
日期:1984.11
A simple, high-yield procedure has now been developed for the direct oxidation of formycin to oxoformycin and oxoformycin B. Treatment of formycin (1) with bromine/water provided oxoformycin (8). A similar treatment of formycin B (4) gave oxoformycin B (6). Upon prolonged exposure of either 1 or 8 to bromine/water at reflux temperature, conversion to 6 occurred in good yield. Application of this procedure
现在已经开发出一种简单,高产率的方法,用于将福霉素直接氧化成氧代福霉素和氧代福霉素B。用溴/水处理的甲醛(8)处理福霉素(1 )。甲霉素B (4)的类似处理产生了氧代甲醛B (6)。在回流温度下长时间将1或8暴露于溴/水中时,以良好的收率转化成6。将该方法应用于1-甲基甲霉素(2),1-甲基甲霉素B (5)和2-甲基甲霉素(17),得到1-甲基氧甲霉素(9),1-甲基氧甲霉素B (7)。和2-甲基氧代福霉素(18)。用亚硝酰氯将8和9脱氨基也分别得到6和7。6-甲基甲霉素的这种选择性氧化得到7-氨基-6-甲基-3-β-D-呋喃呋喃糖基吡唑并[4,3 - d ]嘧啶-5(4 H)-一(10),多柔多辛的C-核苷类似物。1,6-二甲基甲霉素B (11)的类似氧化得到1,6-二甲基氧甲霉素B (12)。5-氧代官能团直接引入吡唑并[4,3- d ]嘧啶环的现象似乎是由于Br +的攻击在N(4)处