New method for the preparation of 3′- and 2′-phosphoramidites of 2′- and 3′-difluoromethyleneuridine
作者:Pawel J. Serafinowski、Colin L. Barnes
DOI:10.1016/0040-4020(96)00364-x
日期:1996.6
step reaction of 2′- and 3′-keto derivatives of uridine 2a, 2b, 7a and 7b with bromodifluoromethyl[tris(dimethylamino)]phosphonium bromide (13) and zinc gives the corresponding 2′- and 3′-difluoromethylene nucleosides 3a, 3b, 8a and 8b in good yield. Removal of the silyl groups affords difluoromethylenated uridines 4a, 4b, 9a and 9b. Phosphitylation of 4a and 9a provides the target 2′- and 3′-phosphoramidites
尿苷2a,2b,7a和7b的2'-和3'-酮衍生物与溴代二氟甲基[三(二甲基氨基)] phosph溴化物(13)和锌的一步反应,得到相应的2'-和3'-二氟亚甲基核苷图3a,3b,8a和8b具有良好的产率。除去甲硅烷基基团得到二氟亚甲基化的尿苷4a,4b,9a和9b。4a和9a的磷酸化提供了用于寡核苷酸合成的目标2'-和3'-亚磷酰胺5和10。