The present invention relates to a process for the preparation of a compound of the formula B having the following steps: provision of a compound of the formula A intramolecular reaction of the compound of the formula A in the presence of an aluminium siloxide of the formula (Ia) or (Ib).
本发明涉及一种制备式为B的化合物的过程,其步骤如下:提供式为A的化合物,在式(Ia)或(Ib)的铝
硅酸盐存在下进行化合物A的分子内反应。