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    • 6. 发明专利
    • PHTHALAZONE COMPOUNDS
    • GB1459606A
    • 1976-12-22
    • GB3870874
    • 1974-09-04
    • INOUE M ISHIKAWA M TSUCHIYA TSHIMAMOTO TAKIO
    • C07D307/89C07D491/048C07D237/32A61K31/495C07D491/04C07C69/76C07C113/02C07D309/10C07D307/88
    • 1459606 4-Hydroxymethylphthalazones M INOUE M ISHIKAWA T TSUCHIYA and T SHIMAMOTO 4 Sept 1974 [30 Oct 1973 31 Oct 1973] 38708/74 Heading C2C The invention comprises compounds of Formula I in which R 1 and R 2 are independently C 1-3 alkyl and R 3 is C 1-5 alkyl or R 2 and R 3 together form a methylene, ethylidene or propylidene group which may be prepared by (a) reacting a compound of Formula II wherein R 1 , R 2 and R 3 are as defined above and Z is alkoxy, halogen, O.CO.O.CH 3 or with an alkali metal borohydride in the presence or absence of a metal halide or (b) reacting a compound of Formula III with hydrazine. The methyl and ethyl esters of 6-carboxy-5,7- dimethyl - 3 - hydroxy - 3 - methylphthalide are prepared by heating the methyl and ethyl esters of 5-carboxy-4,6-dimethylbenzene-1,2-dicarboxylic acid anhydride with malonic acid and pyridine and are reacted with hydrazine to obtain 6,8 - dimethyl - 7 - methoxycarbonyl (or ethoxycarbonyl) - 1 - phthalazone - 4 - carboxylic acid which are in turn esterified by heating with ethanol and concentrated sulphuric acid to obtain the corresponding diesters. 3,5 - Dimethyl - 4,6 - diethoxycarbonylbenzoic acid is refluxed with thionyl chloride to obtain 3,5 - dimethyl - 4,6 - diethoxycarbonylbenzoylchloride which is further reacted with diazomethane to obtain 3,5-dimethyl-4,6-diethoxycarbonyl-w-diazoacetophenone which is cyclized by heating with sulphuric acid in dioxane to obtain 6,8 - dimethyl - 7 - ethoxycarbonyl isochroman-1,4-dione. 8 - Bromomethyl - 4,7 - diethoxycarbonyl - 6- methyl - 1 - phthalazone, obtained by reaction of 6,8 - dimethyl - 4,7 - diethoxycarbonyl - 1 - phthalazone with N-bromosuccinimide and benzoyl peroxide, is heated under vacuum to obtain a compound of the Formula IV 6,8 - Dimethyl - 7 - ethoxycarbonyl - 4 - hydroxymethyl - 1 - phthalazone is refluxed with trifluoroacetic acid to obtain 6,8-dimethyl-7- carboxy - 4 - hydroxymethyl - 1 - phthalazone. Pharmaceutical compositions having activity in the treatment of hypertensive, atherosclerotic and thrombotic diseases and diseases due to misfunction of the cyclic AMP for oral or parenteral administration comprise a phthalazone derivative of Formula I and a pharmaceutically acceptable diluent or carrier.