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    • 6. 发明申请
    • IMPROVED SYNTHESIS AND PREPARATIONS OF INTERMEDIATES AND NEW POLYMORPHS THEREOF USEFUL FOR THE PREPARATION OF DONEPEZIL HYDROCHLORIDE
    • 改进的中间体的合成和制备及其适用于制备二苯乙烯氯化物的新的聚合物
    • WO2007119118A2
    • 2007-10-25
    • PCT/IB2006/004254
    • 2006-11-14
    • MEDICHEM S.A.SOLDEVILLA MADRID, Nuria
    • SOLDEVILLA MADRID, Nuria
    • C07D211/32
    • The invention relates to an improved process for preparing 2-(1-benzylpiperidin-4- ylmethyliden)-5,6-dimethoxyindan-1-one (a key intermediate in the synthesis of donepezil hydrochloride), crystalline polymorph forms of this key intermediate and their use thereof for producing donepezil hydrochloride. In particular, the invention provides an improved method for producing the intermediate 2-(1 -benzylpiperidin-4-ylmethyliden)-5,6- dimethoxyindan-1-one. The process includes reacting 5,6-dimethoxyindan-1-one with 1-benzylpiperidine-4-carbaldehyde using potassium hydroxide in an aqueous solvent. The aqueous solvent can be a mixture of an organic solvent and water. Where the organic solvent is not miscible with water, the reaction may be performed in the presence of a phase transfer catalyst.
    • 本发明涉及一种制备2-(1-苄基哌啶-4-基亚甲基)-5,6-二甲氧基茚满-1-酮(盐酸多奈哌齐的合成中的关键中间体)的改进方法,该关键中间体的结晶多晶型形式 它们用于制备盐酸多奈哌齐。 特别地,本发明提供了制备中间体2-(1-苄基哌啶-4-基亚甲基)-5,6-二甲氧基茚满-1-酮的改进方法。 该方法包括使用氢氧化钾在水性溶剂中使5,6-二甲氧基茚满-1-酮与1-苄基哌啶-4-甲醛反应。 水溶剂可以是有机溶剂和水的混合物。 当有机溶剂不与水混溶时,反应可以在相转移催化剂的存在下进行。