Alkyl addition reaction of pyrimidine 2'-ketonucleosides: Synthesis of 2'-branched-chain sugar pyrimidine nucleosides. Nucleodides and nucleotides. LXXXI.
作者:AKIRA MATSUDA、HIROKO ITOH、KENJI TAKENUKI、TAKUMA SASAKI、TOHRU UEDA
DOI:10.1248/cpb.36.945
日期:——
The reaction of 4-ethoxy-1-(3, 5-O-tetraisopropyldisiloxanyl-1, 3-diyl-β-D-erythro-pentofuran-2-ulosyl)-2(1H)-pyrimidinone (11) with various organometallic reagents yielded corresponding 2'-branched-chain sugar pyrimidine nucleosides. Only in the reactions with MeMgBr and EtMgBr was the more hindered β-attack observed to afford and 2'-alkyl ribofuranosides (13a, b). In the reaction of 11 with MeLi, Me3, Al, or PhMgBr, 2'-methyl or phenyl arabinosides (12a, b, c)were obtained stereoselectively. Conversion of these pyrimidine nucleosides into cytosine derivatives is also described and their antileukemic and antiviral activities are discussed.
4-乙氧基-1-(3,5-O-四异丙基二硅氧烷-1,3-二基-β-D-赤式-戊呋喃-2-糖基)-2(1H)-嘧啶酮(11)与各种有机金属试剂反应,生成了相应的2'-支链糖嘧啶核苷。只有在与MeMgBr和EtMgBr的反应中,观察到更受阻的β-进攻,得到了2'-烷基呋喃糖苷(13a, b)。在11与MeLi、Me3Al或PhMgBr的反应中,立体选择性地得到了2'-甲基或苯基阿拉伯糖苷(12a, b, c)。还描述了这些嘧啶核苷转化为胞嘧啶衍生物的过程,并讨论了它们的抗白血病和抗病毒活性。