It has been found that pyridine-2-carboxamides of the formula ##STR1## wherein R is amino or a residue convertible into amino, and pharmaceutically usable acid addition salts of that carboxamide in which R is amino can be prepared in a simple manner and in good yield by reacting 2,5-dichloropyridine in the presence of a palladium-phosphine catalyst with an alkyne of the formula R.sup.1 --C.tbd.CH III wherein R.sup.1 is hydrogen, lower-alkyl, trimethylsilyl or the group --(R.sup.2)(R.sup.3)--COH and R.sup.2 and R.sup.3 each independently are hydrogen or lower-alkyl or together are cyclopentyl or cyclohexyl, oxidizing the resulting alkyne to give 5-chloropyridine-2-carboxylic acid and reacting this acid or a reactive functional derivative thereof with an amino compound of the formula or with carbon monoxide and an amino compound of formula VI or with carbon monoxide and a lower alkanol which is optionally mixed with water and reacting the resulting acid or the resulting ester with an amino compound of formula VI. The compound of formula I in which R is amino is a known compound which is a reversible and highly active MAO-B inhibitor.
已经发现,式为##STR1##其中R是
氨基或可转化为
氨基的残基,以及其中R为
氨基的药用酸盐的
吡啶-2-羧酰胺可以通过在
钯-膦催化剂存在下将2,5-二
氯吡啶与式为R.sup.1 --C.tbd.CH III的
炔烃反应而以简单的方式和良好的收率制备。其中R.sup.1是氢,低碳基,三甲基
硅基或--(R.sup.2)(R.sup.3)--COH基团,R.sup.2和R.sup.3各自独立地是氢或低碳基,或者一起是环戊基或环己基,将得到5-
氯吡啶-2-
羧酸,并将该酸或其反应性官能团衍
生物与式为VI的
氨基化合物或与
一氧化碳和式为VI的
氨基化合物或与
一氧化碳和可选与
水混合的低碳基醇反应,然后将所得的酸或所得的酯与式为VI的
氨基化合物反应。其中R为
氨基的化合物是已知的化合物,是可逆和高活性的MAO-B
抑制剂。