The present invention relates generally to an improved process for the preparation of 5-azaspiro[2.4]heptane-6-carboxylic acid and its derivatives which are useful intermediates in the synthesis of biologically active molecules, especially in the synthesis of hepatits C virus NS5A inhibitors. In particular, the present invention relates to processes and intermediates for the preparation of compounds of formulae (Ia), (Ib) and (Ic):
本发明涉及一种改进的制备5-azaspiro[2.4]
庚烷-6-
羧酸及其衍
生物的过程,这些化合物是合成
生物活性分子的有用中间体,特别是在合成肝炎C病毒NS5A
抑制剂方面。具体而言,本发明涉及制备式(Ia),(Ib)和(Ic)化合物的过程和中间体: