The present invention proides a process for preparing a pyridine compound of formula (I), where R1, R2, R3 and a are those defined herein. These compounds may be used as intermediates for the preparation of pharmaceutically active NK-1 receptor antagonists.
本发明提供了一种制备式(I)的
吡啶化合物的方法,其中R1、R2、R3和a的定义如本文所述。这些化合物可用作制备具有药理活性的NK-1受体拮抗剂的中间体。