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    • 90. 发明申请
    • PRODUCTION OF AVERMECTIN COMPOUNDS
    • 生产化合物
    • WO99005156A1
    • 1999-02-04
    • PCT/IB1998/000988
    • 1998-06-25
    • A61K31/7048A61P33/10C07H17/08C07H19/01A61K31/70
    • C07H17/08Y02P20/55
    • This invention provides a process for preparing a compound of formula (I): wherein R is H or a hydroxyimino-protecting group; R is H, C1-4 alkyl or C1-4 alkoxy; R is C1-8 alkyl, C2-8 alkenyl or C3-8 cycloalkyl; and R is H, halo, C1-4 alkyl or C1-4 alkoxy, which process comprises the steps of: (a) reacting an avermectin B2 derivative with an oxidizing agent to form a 5-oxo compound; (b) allowing the 5-oxo compound to react with a compound of formula R -O-NH2 wherein R is H or a hydroxyimino-protecting group, to form a 5-imino compound; (c) reacting the 5-imino compound with a thionocarbonizing agent to form a 4'', 23-bisthionocarbonyl ester; (d) reacting the 4'', 23-bisthionocarbonyl ester with a deoxygenation agent to form a 4'', 23-dideoxy compound; and (e) reacting the 4'', 23-dideoxy compound with an acid to form a compound of formula (I).
    • 本发明提供制备式(I)化合物的方法:其中R 1是H或羟基亚氨基保护基; R 2是H,C 1-4烷基或C 1-4烷氧基; R 3是C 1-8烷基,C 2-8链烯基或C 3-8环烷基; 和R 4是H,卤素,C 1-4烷基或C 1-4烷氧基,该方法包括以下步骤:(a)使除虫菌素B2衍生物与氧化剂反应形成5-氧代化合物; (b)使5-氧代化合物与式R 1 -O-NH 2的化合物反应,其中R 1为H或羟基亚氨基保护基,形成5-亚氨基化合物; (c)使5-亚氨基化合物与硫羰化剂反应形成4“,23-双硫羰基酯; (d)使4“,23-双硫代羰基酯与脱氧剂反应以形成4”,23-二脱氧化合物; 和(e)使4“,23-二脱氧化合物与酸反应以形成式(I)的化合物。