A process for the preparation of arylamides of heteroaromatic carboxylic acids of the formula:
in which each An is nitrogen or CRn(n=1 to 5), with the proviso that at least one of the ring members is nitrogen and that two nitrogen atoms are not bonded directly to one another; R1 to R5, if present, independently of one another are hydrogen, C1-4-alkyl or aryl, one of the substituents R1 to R5 being a group of the formula —OR, in which R is an optionally substituted aromatic or heteroaromatic radical; R6 is hydrogen or C1-4-alkyl; and R7 is an optionally substituted aromatic or heteroaromatic radical. The amides are obtained from the corresponding heteroaromatic halogen compounds, the corresponding aromatic amines and carbon monoxide in the presence of a palladium phosphine complex. Compounds of this class are important herbicides.
一种制备杂
环羧酸芳基酰胺的方法,其
化学式为:其中每个An是氮或CRn(n=1至5),但至少一个环成员为氮且两个氮原子未直接相连;R1至R5,如果存在,则独立地是氢、C1-4-烷基或芳基,其中一个取代基R1至R5是公式-OR的基团,其中R是可选的取代芳香族或杂环芳香族基;R6是氢或C1-4-烷基;R7是可选的取代芳香族或杂环芳香族基。这些酰胺是通过相应的杂环卤代化合物、相应的芳香胺和
一氧化碳在
钯膦配合物的存在下获得的。这类化合物是重要的
除草剂。