Method for preparing cefprozil dimethyl formamide solvate
A technology of propylene dimethyl formamide and solvate, which is applied in the field of preparation of important intermediates of antibiotics, and can solve the problems of high price and unstable silylating reagents, etc.
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[0040] Example 1: Preparation of Cefprozil DMF Solvate (I)
[0041] (1) Synthesis of 7-APCA-tetramethylguanidine salt (Compound VII)
[0042] 7-APCA (31.155g, 0.1298mol) was suspended in dichloromethane (240mL), and the temperature was lowered to -15~-5°C. Tetramethylguanidine (14.928g, 0.1298mol) was added dropwise, the temperature was kept and stirred for 30 minutes, and the temperature was kept for later use.
[0043] (2) Synthesis of mixed anhydride (compound VIII)
[0044] D-p-hydroxyphenylglycine Deng potassium salt (45.36g, 0.1497mol) was added to a mixed solution of dichloromethane (60mL), DMF (120mL) and pyridine (0.39mL), and stirred at room temperature to obtain a suspension. When the temperature was lowered to -35°C, a mixed solution of pivaloyl chloride (18.63 mL) and dichloromethane (60 mL) was added dropwise. After the addition is complete, continue stirring at the same temperature for 3 hours.
[0045] (3) Condensation reaction
[0046] At -30°C, the 7-APCA-tetramethyl...
Example Embodiment
[0049] Example 2: Preparation of Cefprozil DMF Solvate (I)
[0050] (1) Synthesis of 7-APCA-tetramethylguanidine salt (Compound VII)
[0051] 7-APCA(III) (31.155g, 0.1298mol) was suspended in dichloromethane (240mL), and the temperature was lowered to -15~-5°C. Tetramethylguanidine (14.928g, 0.1298mol) was added dropwise, the temperature was kept and stirred for 30 minutes, and the temperature was kept for later use.
[0052] (2) Synthesis of mixed anhydride (compound VIII)
[0053] D-p-hydroxyphenylglycine Deng potassium salt (45.36 g, 0.1497 mol) was added to a mixed solution of dichloromethane (117 mL), DMF (74.55 mL) and pyridine (0.39 mL), and stirred at room temperature to obtain a suspension. When the temperature was lowered to -35°C, 18.63 mL of pivaloyl chloride was added dropwise. After the addition is complete, continue stirring at the same temperature for 2 hours, and finally add 62 mL of cold DMF to dilute.
[0054] (3) Condensation reaction
[0055] At -40°C to -30°C, th...
Example Embodiment
[0058] Example 3: Preparation of Cefprozil DMF Solvate (I)
[0059] (1) Synthesis of 7-APCA-tetramethylguanidine salt (Compound VII)
[0060] 7-APCA(III) (31.155g, 0.1298mol) was suspended in dichloromethane (240mL), and the temperature was lowered to -15~-5°C. Tetramethylguanidine (14.928g, 0.1298mol) was added dropwise, the temperature was kept and stirred for 30 minutes, and the temperature was kept for later use.
[0061] (2) Synthesis of mixed anhydride (compound VIII)
[0062] D-p-hydroxyphenylglycine Deng potassium salt (45.36 g, 0.1497 mol) was added to a mixed solution of dichloromethane (117 mL), DMF (74.55 mL) and pyridine (0.39 mL), and stirred at room temperature to obtain a suspension. When the temperature was lowered to -35°C, 18.63 mL of pivaloyl chloride was added dropwise. After the addition is complete, continue stirring at the same temperature for 2 hours, and finally add 62 mL of cold DMF to dilute.
[0063] (3) Condensation reaction
[0064] At -40°C to -30°C, th...
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