Provided are processes for the preparation of 3-(cyclopropylmethoxy)-N-(3,5-dichloropyridine-4-yl)-4-(difluoromethoxy)benzamide (namely roflumilast), its N-oxide and pharmaceutically acceptable acid addition salts, and intermediate compounds 3,4-dihydroxy-N-(3,5-dichloropyridine-4-yl)benzamide, 3-hydroxy-N-(3,5-dichloropyridine-4-yl)-4-(difluoromethoxy)benzamide and 3-(cyclopropylmethoxy)-N-(3,5-dihydroxypyridine-4-yl)-4-(difluoromethoxy)benzamide in the processes.
提供了制备3-(环丙基甲氧基)-N-(3,5-二
氯吡啶-4-基)-4-(二
氟甲氧基)苯甲酰胺(即洛
氟美拉斯特)、其N-氧化物和药学上可接受的酸加盐的过程,以及中间体化合物3,4-二羟基-N-(3,5-二
氯吡啶-4-基)苯甲酰胺、3-羟基-N-(3,5-二
氯吡啶-4-基)-4-(二
氟甲氧基)苯甲酰胺和3-(环丙基甲氧基)-N-(3,5-二
羟基吡啶-4-基)-4-(二
氟甲氧基)苯甲酰胺的制备过程。