Synthesis method of alpha, alpha-difluoro-gamma-hydroxyacetamide derivative
A technology of glycolamide and bromodifluoroacetanilide, which is applied in the field of synthesis of α,α-difluoro-γ-hydroxyacetamide derivatives, can solve the problem of single substrate and achieve good substrate applicability and reaction The effect of good selectivity and good application prospects
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Embodiment 1
[0023] Add 2-bromo-2,2-difluoro-N-phenylacetamide (0.2mmol, 50mg), Rhodamine 6G (0.0025mmol, 1mg) and PMDETA (0.4mmol, 69mg) into a 5mL single-port reaction flask, add olefin Propylbenzene (2 mL) was used as a solvent and a reaction raw material, and reacted for 20 h under 3w white light irradiation at a temperature of 25° C. under an air atmosphere. After the reaction was completed, the reaction system was washed with water and extracted with dichloromethane, and separated into an organic layer and an aqueous layer. After the organic layer was dried with anhydrous sodium sulfate, the solvent was evaporated and concentrated under reduced pressure to obtain a colorless oil. The colorless oil was separated by column chromatography, using a mixture of petroleum ether and ethyl acetate with a volume ratio of 10:1 as the eluent, collecting the eluate containing the target compound, distilling off the solvent and drying to obtain 50 mg of white crystal 2, 2-Difluoro-4-hydroxy-N, 5-d...
Embodiment 2
[0026] The experimental process of Example 2 is the same as that of Example 1, except that "the organic base (PMDETA) in the system is replaced by DIPEA (0.4mmol, 51.6mg)", and other operations are the same as in Example 1, finally obtaining 25mg of white solid 2,2-difluoro-4-hydroxy-N,5-diphenylpentanamide, yield 40%.
Embodiment 3
[0028] The experimental process of embodiment 3 is the same as that of embodiment 1, and the only difference is that "the amount of photocatalyst (Rhodamine 6G) is changed to 0.02mmol". Other operations are the same as in embodiment 1, and finally 34mg of white solid 2,2-difluoro- 4-Hydroxy-N,5-diphenylpentanamide, yield 57%.
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