作者:Carlo Battistini、Antonio Giordani、Antonella Ermoli、Giovanni Franceschi
DOI:10.1055/s-1990-27048
日期:——
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。