The present invention relates to a process for preparing compounds of the general formula (I)
in which R
1
and R
2
are as defined in the description
by reacting compounds of the formula (II)
in which R
1
and R
2
are as defined in the description
with phosgene in the absence of a base and in the presence of one or more diluents and also optionally of a catalyst.
本发明涉及一种制备通式(I)化合物的方法,其中R1和R2如描述中所定义,通过在无碱和一种或多种稀释剂以及可选催化剂的存在下,将通式(II)化合物与
光气反应而得。