申请人:Hoffmann-La Roche Inc.
公开号:US05380861A1
公开(公告)日:1995-01-10
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 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,根据以下公式##STR1##其中R为氨基或可转化为氨基的残基,以及其中R为氨基时的药用酸盐,可以通过在钯膦催化剂存在下将2,5-二氯吡啶与具有以下公式的炔烃R.sup.1 -C.tbd.CH III反应,以简单的方式和高产率制备。其中R.sup.1为氢、低烷基、三甲基硅基或基团--(R.sup.2)(R.sup.3)--COH,而R.sup.2和R.sup.3各自独立地为氢或低烷基,或者一起为环戊基或环己基,将得到的炔烃氧化以获得5-氯吡啶-2-羧酸,然后将该酸或其反应性官能衍生物与具有以下公式的氨基化合物VI反应。其中R为氨基时的公式I化合物是一种已知化合物,是一种可逆且高活性的MAO-B抑制剂。