反应详情

温度

-70 °C

1.3 M sec-butyl-lithium in cyclohexane/hexane (54 ml, 0.07 moles) was dropped into a solution under nitrogen of 3-benzyloxy-N,N-diethyl-4-methoxy-benzamide (20 g, 0.064 moles), obtained as described in example 31, tetramethylethylendiamine (10.56 ml, 0.07 moles) in THF (2.25 1) under stirring in a dry ice bath at −70° C. After 2 hours at constant temperature, DMF (21.75 ml, 0.28 moles) was added. The temperature was kept constant for 4 hours then left overnight. The mixture was poured into a NaH2PO4/Na2HPO4 buffer solution (1 l) at pH=7, the phases were separated, the organic one was washed with water (1 l), dried and brought to dryness. The crude was chromatographed (eluent: benzene:ethyl acetate 1:1) to give 6 g of the title compound (yield: 27.4%).

1. customobtained
2. waitthen left overnight
3. customthe phases were separated
4. washthe organic one was washed with water (1 l)
5. customdried
6. customThe crude was chromatographed (eluent: benzene:ethyl acetate 1:1)