Preparation method of 1-benzyl-8-tert-butyl-2-(hydroxymethyl)-diazaspirane decane dicarboxylate
A technology of azaspirone and dicarboxylate, which is applied in the field of preparation of 1-benzyl 8-tert-butyl 2--diazaspiroane decane dicarboxylate, can solve the problem that there is no suitable industrial synthesis method and other problems, to achieve the effect of short synthetic route, easy reaction and convenient operation
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Embodiment 1
[0010] Example 1: a. Compound 1 (3 g, 18 mmol) was dissolved in anhydrous dichloromethane (30 mL), the reaction solution was lowered to 0°C, oxalyl chloride (3 mL) was added dropwise thereto, and then N , N-dimethylformamide (0.03 mL), after the dropwise addition, the reaction was carried out at room temperature for 5 hours. The mixture was distilled under reduced pressure to obtain crude compound 2 (3 g) as a brown oil, with a yield of 100%.
[0011] b. Dissolve compound 2 (3 g, 18 mmol) and N,O-dimethylhydroxylamine hydrochloride (2.3 g, 23 mmol) in dichloromethane (40 mL), and cool the reaction system to 0°C, Therein, triethylamine (4.5 g, 45 mmol) was slowly added dropwise, and the reaction was controlled at zero to continue the reaction for 4 hours. TLC (petroleum ether / ethyl acetate volume ratio=3 / 1) showed that the reaction was complete. The reaction solution was washed twice with water and saturated brine respectively, dried over sodium sulfate, filtered and concentr...
Embodiment 2
[0016] Example 2: a. Compound 1 (300 g, 1.8 mol) was dissolved in anhydrous dichloromethane (2 L), the reaction solution was lowered to 0°C, oxalyl chloride (300 mL) was added dropwise thereto, and then N,N-Dimethylformamide (3 mL), after the dropwise addition, the reaction was carried out at room temperature for 5 hours. The mixture was distilled under reduced pressure to obtain compound 2 (332 g) as a brown oil, with a yield of 100%.
[0017] b. Dissolve compound 2 (332 g, 1.8 mol) and N,O-dimethylhydroxylamine hydrochloride (228 g, 2.3 mol) in dichloromethane (4 L), cool the reaction system to 0°C, Therein, triethylamine (454.5 g, 4.5 mol) was slowly added dropwise, and the reaction was controlled at zero to continue the reaction for 4 hours. TLC (petroleum ether / ethyl acetate volume ratio=3 / 1) showed that the reaction was complete. The reaction solution was washed twice with water and saturated brine respectively, dried over sodium sulfate, filtered and concentrated by d...
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