In pursuit of a better route: A new catalytic asymmetric synthesis of Tamiflu was developed. The key transformation was an asymmetricDiels–Alder‐type reaction of 1 and 2 catalyzed by a barium/F2‐FujiCAPO complex in the presence of a CsF co‐catalyst to construct the core of Tamiflu (see scheme; TMS=trimethylsilyl). The product was converted into Tamiflu in 11 steps on a gram scale.
为了寻求更好的途径:开发了新的达菲催化不对称合成方法。关键的转变是钡/ F 2 -FujiCAPO络合物在存在CsF助催化剂的情况下催化1和2的不对称Diels-Alder型反应,从而构成了达菲的核心(见方案; TMS =三甲基甲硅烷基)。以克为单位,将产品分11步转化为达菲。
A method for the synthesis of an oseltamivir PET tracer
A protocol applicable for the synthesis of an oseltamivir positron emission tomography (PET) tracer was developed. Acetylation of amine 3 with CH3COCl, followed by deprotection and aqueous workup, produced oseltamivir 4 from 3 within 10 min. The obtained 4 was sufficiently pure for PET studies. This method can be extended to PET tracer synthesis using (CH3COCl)-C-11. (c) 2007 Elsevier Ltd. All rights reserved.