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    • 7. 发明授权
    • Method for the production of 1,3-dioxolane-2-ones and carboxylic acid esters by means of transacylation in basic reaction conditions
    • 在碱性反应条件下通过转酰胺生产1,3-二氧戊环-2-酮和羧酸酯的方法
    • US08263788B2
    • 2012-09-11
    • US12677920
    • 2008-09-03
    • Joerg BrandenburgRolf DachHanfried Baltes
    • Joerg BrandenburgRolf DachHanfried Baltes
    • C07D409/00C07D491/00C07D491/08
    • C07D491/10C07D317/34C07D317/72C07D409/14C07D451/10C07D451/12
    • The invention relates to a method for producing 1,3-dioxolane-2-ones of general formula (3) in basic reaction conditions by reesterifying the respective ester of general formula (1) in which R1 to R5 have the meanings indicated in the claims and the description. The invention further relates to a method for producing 2-hydroxy carboxylic acid esters of general formula (5) with or without isolation of the intermediate in the form of a derivative of the 1,3-dioxolane-2-one of general formula (3) in basic reaction conditions by reesterifying the respective ester of general formula (1) in which R1, R2, and R6 have the meanings indicated in the claims and the description. The method according to the invention allows the reaction to take place in very gentle basic conditions, causing fewer secondary reactions and providing a greater yield than reactions in highly polar aprotic solvents. Acid-sensitive and/or temperature-sensitive compounds can be synthesized.
    • 本发明涉及在碱性反应条件下制备通式(3)的1,3-二氧戊环-2-酮的方法,该方法是将通式(1)的各酯酯化,其中R 1至R 5具有权利要求中所示的含义 和描述。 本发明还涉及一种通式(5)的2-羟基羧酸酯的制备方法,该方法具有或不分离通式(3)的1,3-二氧戊环-2-酮衍生物形式的中间体 )在碱性反应条件下,通过使通式(1)的相应酯重新酯化,其中R 1,R 2和R 6具有权利要求书和说明书中所示的含义。 根据本发明的方法允许反应在非常温和的碱性条件下进行,引起较少的次级反应并且提供比在高极性非质子溶剂中的反应更大的产率。 可以合成酸敏感和/或温度敏感的化合物。