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    • 96. 发明专利
    • PRODUCTION OF 2-AZETIDINONES
    • JPH07330721A
    • 1995-12-19
    • JP12098794
    • 1994-06-02
    • SHIRATORI PHARM
    • ISOBE TOSHIO
    • C07D205/08C07D403/04
    • PURPOSE:To provide a method for readily, industrially and advantageously producing 2-azetidinones useful as a medicine or a synthetic intermediate under nearly neutral mild conditions. CONSTITUTION:This method for producing 2-azetidinones of formula II [R to R are each an organic group), e.g. 1-(4-methoxyphenyl)-3-phenoxy-4- phenylazetidin-2-one is to react carboxylic acids having hydrogen atom at the alpha-position with imines in the presence of a base (e.g. pyridine or triethylamine) using a haloiminium salt of formula I [R and R are each a lower alkyl; X is a halogen; (n) is 2 or 3]. In the method, since the compound of formula I is converted into a water-soluble compound of formula III, the separation and purification can readily be carried out. The objective compound of formula II can simply be isolated according to a conventional method such as distillation or recrystallization. The compound of formula I is readily obtained by reacting the compound of formula III with a well-known halogenating agent.
    • 97. 发明专利
    • PRODUCTION OF 4-OXO-1,3-BENZOXAZINE COMPOUNDS
    • JPH06247946A
    • 1994-09-06
    • JP3193193
    • 1993-02-22
    • SHIRATORI PHARM
    • ISOBE TOSHIO
    • C07D265/22
    • PURPOSE:To produce the subject compound useful as a medicine, an agrochemical, etc., in a high yield by subjecting an N-acylanthranilic acid and an iminium halide salt to a dehydrative reaction. CONSTITUTION:An N-acylanthranilic acid of formula I (R , R are organic groups) is reacted with an iminium halide salt of formula II (R , R are lower alkyl ; X is halogen; (n) is 2,3) as a dehydrating agent in the presence of a base (e.g. triethylamine) in a solvent-free state or in a solvent (e.g. methylene chloride) at approximately room temperature to produce the objective compound of formula III. Approximately 1 mole of the compound of formula II and approximately 2 moles of the base are used per mole of the compound of formula I. The reaction can be performed under nearly neutral and mild conditions without being influenced by the properties of the compound of formula I. The compound of formula III includes 2-ethyl-4-oxo-1,3-benzoxazine.