Disclosed herein is a novel process for the preparation of a compound of formula (I),
In which a compound of formula (II) is reacted with a Lewis acid to produce a compound of formula (III); and the compound of formula (III) is subsequently reacted with dihalomethane to give the desired compound of formula (I);
wherein R is nil or C
1-6
alkyl, and X is nil, a nitro group, an amino group or a halogen selected from the group consisting of F, Cl, Br and I.
本文披露了一种用于制备化合物的新工艺的公式(I),其中用Lewis酸与公式(II)的化合物反应以产生公式(III)的化合物;然后将公式(III)的化合物与二卤
甲烷反应,得到所需的公式(I)的化合物;其中R为零或C1-6烷基,X为零、硝基、
氨基或从F、Cl、Br和I组成的卤素中选择的卤素。