The first Cu- and amine-free Sonogashira-type cross-coupling in the C-6-alkynylation of protected 2′-deoxyadenosine
作者:Felix N. Ngassa、Erick A. Lindsey、Brandon E. Haines
DOI:10.1016/j.tet.2009.03.064
日期:2009.5
The Sonogashira cross-coupling reaction offers a convenient route to C(sp)–C(sp2) bond formation. Although the Sonogashira reaction has traditionally been carried out in the presence of Pd catalyst and a co-catalyst of Cu(I) salt, the use of Cu(I) salt is often not efficient because it leads to the formation of unwanted side-products. This has prompted interest in recent years in the development of
Sonogashira交叉偶联反应为到达C(sp)–C(sp 2)键的形成。尽管Sonogashira反应传统上是在Pd催化剂和Cu(I)盐的助催化剂存在下进行的,但是Cu(I)盐的使用通常效率不高,因为它会导致形成不需要的副产物。近年来,这引起了人们对开发无Cu Sonogashira交叉偶联反应条件的兴趣。另外,用于核苷衍生物的炔基化的无铜Sonogashira交叉偶联条件的开发在很大程度上仍未开发。本文中,我们证明了无铜和无胺的Sonogashira型交叉偶联可成功实现芳基溴化物和杂芳基溴化物的炔基化。首次,我们扩展了这种方法,用于在C-6位保护的2'-脱氧腺苷进行炔基化。