作者:Tetsuya Kodama、Akira Matsuda、Satoshi Shuto
DOI:10.1016/j.tet.2006.07.101
日期:2006.10
The first synthesis of 1′-fluoronucleosides, which has long been synthetic targets as the potential antimetabolites, was achieved. Electrophilic fluorination of the 1′-position occurred to form an anomeric mixture of 1′-fluorouridine derivatives, when the lithium enolate, prepared from 3′,5′-O-tetraisopropyldisiloxane-1,3-diyl (TIPDS)-protected 2′-ketouridine (10) and LiHMDS, was treated with an electrophilic
实现了1'-氟核苷的首次合成,该合成物长期以来一直是潜在的抗代谢物的合成靶标。当由3',5'- O-四异丙基二硅氧烷-1,3-二基(TIPDS)保护的2'制备的烯醇锂形成1'-位置时发生亲电氟化反应,形成1'-氟尿苷衍生物的异头混合物。用亲电子氟化剂如NFSI(13)处理-ketouridine(10)和LiHMDS 。随后降低所得β-核苷的2'-酮基部分,得到被保护的1'-氟尿苷16及其阿拉伯型同源物17。或者,亲核氟化也成功。因此,2',3',5'-tri- O的处理用DAST / NBS制备的-乙酰基1'-苯基硒基尿苷(20)生成了1'-氟尿苷三乙酸酯(21)及其α-端异构体22。