Transition-Metal-Mediated Synthesis of Novel Carbocyclic Nucleoside Analogues with Antitumoral Activity
作者:Juraj Velcicky、Andreas Lanver、Johann Lex、Aram Prokop、Thomas Wieder、Hans-Günther Schmalz
DOI:10.1002/chem.200400079
日期:2004.10.18
Subsequent steps involve diastereoselective ketone reduction and fully regio- and diastereoselective introduction of the nucleobase through Pd(0)-catalyzed allylic substitution. The generality of the method was demonstrated by preparation of CNAs in both enantiomeric series with all five natural nucleobases, as well as 5-bromouracil, 5-fluorouracil, and 6-chloropurine. Screening of the various compounds
开发了新的(单保护的)碳环核苷类似物(CNA),其核碱基连接到3-羟甲基-4-三烷基甲硅烷基氧甲基环戊-2-烯-1-基骨架上的面向多样性的对映选择性合成。作为关键中间体,由1,1-二烯丙氧基-3制备了外消旋(5SR,8RS)-8-烯丙氧基-2-三甲基甲硅烷基-7-氧杂双环[3.3.0]-辛-1-烯-3-酮-三甲基甲硅烷基-2-丙炔在钴介导的Pauson-Khand反应中的作用。对映体纯的材料是通过有效的动力学拆分(在-78摄氏度下,选择性因子s> / = 40),通过邻苯二甲硼烷催化的儿茶酚硼烷催化的硼烷还原(CBS还原)获得的。解析产物的绝对构型由CD光谱,Mosher酯分析和化学相关性确定。随后的步骤包括非对映选择性酮还原以及通过Pd(0)催化的烯丙基取代对核碱基的完全区域和非对映选择性的引入。通过制备具有所有五个天然核碱基以及5-溴尿嘧啶,5-氟尿嘧啶和6-氯嘌呤的对映体系列中的CN