Synthesis of thiazole-4-carboxamide-adenine difluoromethylenediphosphonates substituted with fluorine at C-2′ of the adenosine
作者:Andrzej Zatorski、Pawell Lipla、Nevena Mollova、Karl H. Schram、Barry M. Goldstein、Kyoichi A. Watanabe、Krzysztof W. Pankiewicz
DOI:10.1016/0008-6215(93)84063-c
日期:1993.10
Synthesis of an analogue 3 of thiazole-4-carboxamide adenine-dinucleotide (TAD) in which the beta-oxygen atom of the pyrophosphate bridge is replaced by a difluoromethylene group has been achieved. Likewise, 2'-deoxy-2'-fluoroadenosine containing analogues of TAD (4) and its difluoromethylenediphosphonate congener (5) have been synthesized. Adenosine 5'-difluoromethylenediphosphonate (8) was prepared
已经合成了噻唑-4-羧酰胺腺嘌呤二核苷酸(TAD)的类似物3,其中焦磷酸桥的β-氧原子被二氟亚甲基取代。同样,已经合成了含有2'-脱氧-2'-氟腺苷的TAD类似物(4)及其二氟亚甲基二膦酸盐同类物(5)。腺苷5'-二氟亚甲基二膦酸酯(8)是由5'-O-甲苯磺酰基腺苷(6)和三(四正丁基铵)二氟亚甲基二膦酸酯(7)通过改进的Poulter方法制备的。通过用原甲酸三乙酯处理将化合物8转化为2',3'-环状碳酸酯9。用2',3'处理9 在DCC存在下,在吡啶中的-O-异亚丙基亚氮杂呋喃(10)得到二核苷酸11和异亚丙基保护的二腺苷四膦酸酯12的混合物。将11脱保护后,所需的β-二氟亚甲基TAD(3)通过HPLC分离为次要化合物。产品。获得了Ap4A的类似物二腺苷四膦酸腺苷12作为主要成分。或者,将2',3'-O-异丙基亚氮杂呋喃酯(10)甲苯磺酸化,并通过与7偶合,将产物13进一步转化为相应的二