There is provided a process for the preparation of a compound of formula I, wherein X, R1, R2a, R2b, R2c, R2d, R2e, R3a, R3b, R3c, R3d and R3e are as described in the description. Such compounds may, for example, be useful medicament (or intermediates for medicaments).式Iの化合物の調製方法を提供し、X、R1、R2a、R2b、R2c、R2d、R2e、R3a、R3b、R3c、R3d及びR3eは明細書中に記載されている。かかる化合物は、例えば有用な医薬(又は医薬のための中間体)でありうる。