Nucleosides and nucleotides. LXV Synthesis of 8,2'-methano- and 8,2'-ethanoadenosines.
作者:HIROYUKI USUI、TOHRU UEDA
DOI:10.1248/cpb.34.1518
日期:——
Treatment of 3', 5'-O-(tetraisopropyldisiloxane-1, 3-diyl)-2'-ketoadenosine (1) with methylenetriphenylphosphorane gave the 2'-methylene derivative (2). Hydroxylation of 1 with OsO4 gave the 2'-hydroxymethyladenosine (4), which was then converted to the 2'-phenylthiomethyl derivative (5). Photocyclization followed by deprotection of the product furnished 8, 2'-methanoadenosine (7), and adenosine fixed in a high-anti conformation. Oxidation of a 2'-hydroxyethylideneadenosine with OsO4 gave the 2'-dihydroxyethyladenosine (10), which was also converted to the 2'-(2-phenylthioethyl) derivative (11). The photocyclization of 11 and successive elimination of the hydroxyl group gave the 8, 2'-ethenoadenosine (13). Catalytic hydrogenation and deprotection of 13 afforded 8, 2'-ethanoadenosine (15). The circular dichroism spectral features of C-cycloadenosine are discussed.
将 3',5'-O-(四异丙基二硅氧烷-1,3-二基)-2'-酮腺苷 (1) 与亚甲基三苯基膦处理,可得到 2'-亚甲基衍生物 (2)。用 OsO4 对 1 进行羟基化反应,得到 2'- 羟甲基腺苷 (4),然后将其转化为 2'- 苯硫甲基衍生物 (5)。对产物进行光环化和脱保护处理后,得到 8、2'-甲基腺苷(7)和以高反构象固定的腺苷。用 OsO4 氧化 2'-hydroxyethylideneadenosine 可以得到 2'-dihydroxyethyladenosine (10),它还可以转化为 2'-(2-phenylthioethyl) 衍生物 (11)。11 的光环化和羟基的连续消除得到了 8,2'-乙烯腺苷(13)。对 13 进行催化氢化和脱保护处理后,得到了 8,2'-乙烯腺苷(15)。本文讨论了 C-胞二色谱的光谱特征。