Nucleic Acid Related Compounds. 105. Synthesis of 2‘,3‘-Didehydro-2‘,3‘-dideoxynucleosides from Ribonucleoside Cyclic 2‘,3‘-(Sulfates or Phosphates) or 2‘,3‘-Dimesylates via Reductive Elimination with Sodium Naphthalenide<sup>1</sup>
作者:Morris J. Robins、Elzbieta Lewandowska、Stanislaw F. Wnuk
DOI:10.1021/jo981013m
日期:1998.10.1
gave the 2',3'-unsaturated nucleosides. Parallel treatment of adenosine cyclic 2',3'-phosphate gave the 2',3'-olefin. The adenine, hypoxanthine, and 2-amino-6-methoxypurine 2',3'-didehydro-2',3'-dideoxynucleosides were prepared efficiently (40-60% overall yields of crystalline, analytically pure products; 3-5 steps, some combined into one-flask procedures) by treatment of 5'-O-protected 2',3'-di-O-mesylribonucleosides
用亚硫酰氟处理嘌呤核糖核苷导致形成环状2',3'-亚硫酸酯。5'-羟基的乙酰化和Sharpless氧化(NaIO(4)/ RuCl(3))得到环状2',3'-硫酸酯衍生物。用亚硫酰氯处理5'-O-甲硅烷基保护的核糖核苷,然后氧化,得到了环状2',3'-硫酸盐的另一种途径。用萘钠(THF / -50℃)还原消除,得到2′,3′-不饱和核苷。腺苷环2',3'-磷酸的平行处理得到2',3'-烯烃。有效地制备了腺嘌呤,次黄嘌呤和2-氨基-6-甲氧基嘌呤2',3'-二氢-2',3'-二脱氧核苷(结晶,分析纯产品的总收率为40-60%; 3-5个步骤,通过将5'-O-保护的2',3'-di-O-甲磺酰基核糖核苷用萘钠处理来将它们合并成一个烧瓶。反应是在环境温度或低于环境温度的条件下使用容易获得的试剂和标准实验室条件进行的。