申请人:——
公开号:US05168113A1
公开(公告)日:1992-12-01
A mercapto-substituted pyridine compound having formula (I): ##STR1## where R.sub.1 and R.sub.2 are alkyl groups, and n is 0 or 1, and salts thereof and a process for preparing the same are disclosed. The mercapto-substituted pyridine compound is useful as an intermediate for preparing a herbicidal compound. The present invention further provides aminocarbonyl-substituted pyridinesulfinic acid (ACPS) or salts thereof as the precursor of aminosulfonyl-substituted pyridinecarbonic acid amide compound (APCA) which is useful as the starting material for agricultural chemicals, medicine, etc. Moreover, the preparation process of the present invention is an industrially advantageous preparation process which is capable of preparing in a series of steps from mercapto-substituted pyridinecarboxylic acid amide compound (MPCA) or aminocarbonyl-substituted halogenopyridine compound (ACHP) to ACPS or salts thereof, and further to APCA.
本发明揭示了一种具有以下式子(I)的硫醇取代吡啶化合物:##STR1## 其中R.sub.1和R.sub.2是烷基,n为0或1,以及其盐和制备方法。该硫醇取代吡啶化合物可用作制备除草剂化合物的中间体。本发明进一步提供氨基羰基取代吡啶磺酸(ACPS)或其盐作为氨基磺酰取代吡啶羧酸酰胺化合物(APCA)的前体,后者可用作农药、药品等的起始材料。此外,本发明的制备方法是一种工业上有利的制备方法,能够从硫醇取代吡啶羧酸酰胺化合物(MPCA)或氨基羰基取代卤代吡啶化合物(ACHP)开始,经一系列步骤制备ACPS或其盐,进一步制备APCA。