Process for the preparation of 4-(6'-methoxy-2'-naphthyl) butan-2-one
    1.
    发明授权
    Process for the preparation of 4-(6'-methoxy-2'-naphthyl) butan-2-one 失效
    4-(6'-甲氧基-2'-萘基)丁-2-酮的制备方法

    公开(公告)号:US5955635A

    公开(公告)日:1999-09-21

    申请号:US065972

    申请日:1998-04-24

    摘要: An improved process for the preparation of Nabumetone, which comprises the following steps:a) condensation between 6-methoxy-naphthaldehyde I and t-butyl acetoacetate II, to give 3-t-butoxycarbonyl-4-(6'-methoxy-2'-naphthyl)-but-3-en-2-one III as an E/Z mixture;b) hydrogenation of III in the presence of a palladium catalyst, to give 3-t-butoxycarbonyl-4-(6'-methoxy-2-naphthyl)-butan-2-one IV;c) cleavage of the t-butyl ester by acid catalysis; andd) recrystallization of the crude with methanol.

    摘要翻译: 一种改进的Nabumetone制备方法,其包括以下步骤:a)6-甲氧基 - 萘甲醛I和乙酰乙酸叔丁酯II之间的缩合,得到3-叔丁氧基羰基-4-(6'-甲氧基-2' - 萘基) - 丁-3-烯-2-酮III作为E / Z混合物; b)在钯催化剂存在下氢化III,得到3-叔丁氧基羰基-4-(6'-甲氧基-2-萘基) - 丁-2-酮IV; c)通过酸催化裂解叔丁酯; 和d)用甲醇重结晶粗品。