Process for the preparation of 2′-O-alkyl-guanosine, cytidine, and uridine phosphoramidites
申请人:ISIS Pharmaceuticals, Inc.
公开号:US06242592B1
公开(公告)日:2001-06-05
Processes for preparing 2′-O-alkylated guanosine, uridine, cytidine, and 2,6-diaminopurine 3′-O-phosphoramidites include the steps of alkylating nucleoside precursors, adding suitable blocking groups and phosphitylating. For the guanosine 2′-O-alkylated 3′-O-phosphoramidites, alkylation is effected on 2,6-diamino-9-(&bgr;-D-ribofuranosyl) purine followed by deamination. For uridine 2′-O-alkylated 3′-O-phosphoramidites, alkylation is effect on a dialkyl stannylene derivative of uridine. For cytidine 2′-O-alkylated 3′-O-phosphoramidites, alkylation is effected directly on cytidine. Alkylation is effected directly upon 2,6-diaminopurine.
制备2'-O-烷基化鸟苷、尿苷、胞苷和2,6-二氨基嘌呤3'-O-磷酰胺酯的过程包括烷基化核苷前体、添加适当的阻断基和磷酰化步骤。对于鸟苷2'-O-烷基化3'-O-磷酰胺酯,烷基化作用在2,6-二氨基-9-(&bgr;-D-核糖)嘌呤上,然后进行去氨作用。对于尿苷2'-O-烷基化3'-O-磷酰胺酯,烷基化作用在尿苷的二烷基锡衍生物上。对于胞苷2'-O-烷基化3'-O-磷酰胺酯,烷基化作用直接在胞苷上。烷基化作用直接作用在2,6-二氨基嘌呤上。