申请人:Bayer Aktiengesellschaft
公开号:US04555577A1
公开(公告)日:1985-11-26
The new 2,4-dichloro-5-thiazolecarboxaldehyde of the formula ##STR1## can be prepared in good yields by reacting 2,4-thiazolidinedione (III) with 1-1.5 mol of dimethylformamide and 3-10 mol of phosphorus oxychloride at the reflux temperature of the reaction mixture (about 115.degree. C.) until evolution of HCl gas has ended, and then working up hydrolytically. The aldehyde (II) can readily be converted, via the new oxime (IV), into the corresponding nitrile, 2,4-dichloro-5-cyanothiazole (V), which is a known intermediate for the preparation of herbicidal active compounds of the thiazolyloxyacetamide type.
公式为 ##STR1## 的新的2,4-二氯-5-噻唑羧醛可以通过将2,4-噻唑烷二酮(III)与1-1.5摩尔的二甲基甲酰胺和3-10摩尔的氧化亚磷酰氯在反应混合物的回流温度(约115°C)下反应,直到氢氯酸气体的生成结束,然后进行水解处理,可以得到良好的收率。醛(II)可以通过新的肟(IV)轻松地转化为相应的腈,即2,4-二氯-5-氰基噻唑(V),这是一种用于制备噻唑氧乙酰胺类除草活性化合物的已知中间体。