Nucleosides and nucleotides. LXIV. Synthesis of 2'-deoxy-8,2'-ethanoadenosine and 3'-deoxy-8,3'-ethanoadenosine.
作者:HIROYUKI USUI、TOHRU UEDA
DOI:10.1248/cpb.34.15
日期:——
2'-Deoxy-8, 2'-ethanoadenosine and its 3'-isomer were synthesized from 2'- and 3'-keto-adenosine derivatives. Treatment of 3', 5'-O-(tetraisopropyldisiloxane-1, 3-dilyl)-2'-ketoadenosine with ethoxycarbonylmethylenetriphenylphosphorane gave the 2'-ethoxycarbonylmethylene derivative, which was reduced to the 2'-hydroxyethyl derivative. This compound was converted to the 2'-iodoethyl-N6, N6-dibenzoyladenosine, which was cyclized by treatment with tri-n-butyltin hybride, then deprotected to furnish 2'-deoxy-8, 2'-ethanoadenosine. Photocyclization of a 2'-phenylthioethyl derivative also gave the ethano-cycloadenosine. 3'-Deoxy-8, 3'-ethanoadenosine was prepared from 2', 5'-di-O-(tert-butyldimethylsilyl)-3'-ketoadenosine via 2', 5'-di-O-acetyl-3'-deoxy-3'-phenylthioethyladenosine by photocyclization. The circular dichroism spectral features of these cycloadenosines are presented.
2'-脱氧-8, 2'-乙基腺苷及其3'-异构体是从2'-和3'-酮腺苷衍生物合成的。将3', 5'-O-(四异丙基二硅氧烷-1, 3-二烯基)-2'-酮腺苷与乙氧基羧基亚甲基三苯基膦进行反应,得到2'-乙氧基羧基亚甲基衍生物,该衍生物被还原为2'-羟乙基衍生物。该化合物进一步转化为2'-碘乙基-N6, N6-二苯甲酰腺苷,并通过用三正丁基锡氢化物处理使其环化,随后去保护,生成2'-脱氧-8, 2'-乙基腺苷。2'-苯基硫乙基衍生物的光环化反应也产生了乙基环腺苷。3'-脱氧-8, 3'-乙基腺苷是通过2', 5'-二-O-(叔丁基二甲基硅氧基)-3'-酮腺苷,经过2', 5'-二-O-乙酰-3'-脱氧-3'-苯基硫乙基腺苷的光环化合成的。这些环腺苷的圆二色性光谱特征被展示。