The present invention relates to a process for preparing a compound of the formula I
or a pharmaceutically acceptable salt, prodrug, hydrate or solvate thereof. wherein R
1
, R
2
, R
3
and R
4
are as defined herein. The compound of formula I is useful in the treatment of abnormal cell growth, such as cancer in mammals.
                            本发明涉及一种制备公式I化合物或其药学可接受的盐、前药、
水合物或溶剂化物的方法,其中R1、R2、R3和R4如本文所定义。公式I化合物在治疗哺乳动物中的异常细胞生长,如癌症方面具有用途。