Diastereofacial Selective Addition of Ethynylcerium Reagent and Barton−McCombie Reaction as the Key Steps for the Synthesis of <i>C</i>-3‘-Ethynylribonucleosides and of <i>C</i>-3‘-Ethynyl-2‘-deoxyribonucleosides
作者:Pierre M. J. Jung、Alain Burger、Jean-François Biellmann
DOI:10.1021/jo9704568
日期:1997.11.1
starting from the corresponding nucleosides. The desired stereochemistry of the C-3' tertiary alcohol was obtained by reaction of an ethynylcerium-lithium reagent on a 3'-ketonucleoside with the hydroxyl group at C-5' unprotected. The 2'-deoxygenation was performed by a Barton-McCombie reaction under appropriate conditions where the addition of tin hydride to the triple bond was suppressed. Evaluation of
我们描述了从相应的核苷开始制备3'-炔基尿苷4a和-腺苷4b以及3'-炔基-2'-脱氧尿苷16a和-腺苷16b的方法。通过使乙炔基铈-锂试剂在3'-酮核苷上与未保护的C-5'处的羟基反应,可获得所需的C-3'叔醇立体化学。通过Barton-McCombie反应在适当的条件下进行2'-脱氧,其中在三键上抑制了氢化锡的添加。报道了对C-3'修饰的核苷的抗HIV活性的评估。