A new synthesis of 3′-fluoro-3′-deoxyadenosine is described. Start- ing from adenosine via a suitably protected intermediate by triflate activation and nucleophilic displacement with sodium acetate, the "xylo" epimer is obtained in two cases with different silyl groups protecting the 2′-position. Treatment of the xylo derivatives with diethylaminosulphur trifluoride gives the corresponding 3′-fluoro derivatives with inversion of the configuration. The reaction se- quence affords protected derivatives allowing selective deblocking of the 5′ or 2′-position.
本文描述了 3′-
氟-3′-脱氧
腺苷的一种新合成方法。从
腺苷开始,通过适当保护的中间体,经三
氯酸盐活化和
醋酸钠亲核置换,在两种情况下得到了 "xylo "外嵌合体,其 2′位有不同的
硅基保护。用
二乙胺基三氟化硫处理 xylo 衍
生物,可得到相应的 3′-
氟衍
生物,其构型发生反转。该反应序列可产生受保护的衍
生物,从而可选择性地对 5′或 2′位进行解锁。