Nucleosides and nucleotides. 96. Synthesis and antitumor activity of 5-ethynyl-1-.beta.-D-ribofuranosylimidazole-4-carboxamide (EICAR) and its derivatives
作者:Noriaki Minakawa、Takayuki Takeda、Takuma Sasaki、Akira Matsuda、Tohru Ueda
DOI:10.1021/jm00106a045
日期:1991.2
the reaction was done with use of trimethyl-[(tributylstannyl)ethynyl]silane in the absence of triethylamine to afford the desired 5-(2-trimethylsilyl)ethynyl derivative 9a in good yield. Furthermore, the similar cross-coupling reaction of 5-iodo-1-(2,3,5-tri-O-acetyl-beta-D-ribofuranosyl)imidazole-4-carboni tri le (12) with (trimethylsilyl)acetylene also afforded the desired nucleoside 13a. Deprotection
在存在下,5-碘-1-(2,3,5-三-O-乙酰基-β-D-核呋喃呋喃糖基)咪唑-4-羧酰胺(8)的钯催化交叉偶联反应在含三乙胺的乙腈中的双(苄腈)二氯化钯以高收率得到了所需的5-炔基衍生物9。但是,当使用(三甲基甲硅烷基)乙炔时,唯一可分离的产物是不希望的二聚体,即1,2-双(4-氨基甲酰基-1-β-D-呋喃呋喃基氨基咪唑-5-基)乙炔衍生物10a。为了避免这种二聚物的形成,在没有三乙胺的情况下,使用三甲基-[(三丁基锡烷基)乙炔基]硅烷进行反应,以高收率得到所需的5-(2-三甲基甲硅烷基)乙炔基衍生物9a。此外,5-iodo-1-(2,3,具有(三甲基甲硅烷基)乙炔的5-三-O-乙酰基-β-D-呋喃呋喃糖基)咪唑-4-碳三化合物(12)也提供了所需的核苷13a。这些化合物的脱保护提供了5-炔基-1-β-D-呋喃呋喃基嘧啶唑-4-羧酰胺(6b-k)和-甲腈(14b-f)。其中,5-乙