| 摘要 |
The invention relates to a process for the preparation of compounds of the formula 1 <IMAGE> characterised in that a compound of the formula <IMAGE> in which R denotes lower alkyl, preferably methyl, is reacted with N-trimethylsilylsulphamide of the formula (4> (CH3)3SiNHSO2NH2 in the presence of a variable amount of a metal alkoxide or alcoholate, preferably of a catalytic amount of sodium methoxide, in a polar solvent, preferably methanol, or the above compound is reacted with a sulphamide of the formula (3> H2NSO2NH2 in the presence of a variable amount of an alkoxide, preferably of a catalytic amount of sodium methoxide, and a trialkylalkoxysilane, such as trimethylmethoxysilane, in a polar solvent, such as methanol.
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