Mercapto-substituted pyridine compounds, aminocarbonyl-substituted pyridinesulfinic acid compounds and process for preparing the same

摘要

An aminocarbonyl-substituted pyridinesulfinic acid intermediate for production of an herbicide having formula (V): <IMAGE> (V) wherein R3 and R4 are selected from the group consisting of hydrogen and alkyl groups, or a salt thereof. The aminocarbonyl-substituted pyridinesulfinic acid or salt thereof is useful as the precursor of aminosulfonyl-substituted pyridinecarbonic acid amide, which in turn is useful as the starting material for agricultural chemicals, medicine, etc.