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North, M.1
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Y. Abiko, N. Yamagiwa, M. Sugita, J. Tian, S. Matsunaga, and M. Shibasaki Synlett 2004 2434 2436
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0002889761
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0035914094
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Nguyen, T.V.7
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55
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77954242652
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note
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2 (29%) and EtOH (56%).
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56
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77954242941
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note
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3 in MeOH to afford the corresponding cyanohydrin in 93% yield.
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77954244178
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note
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4. After concentration, the crude material was purified by column chromatography (silica gel: 6 g, hexane-EtOAc: 6/1) to give the product 7a (115.0 mg, 96% yield) as a colorless solid.
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77954242344
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Typical procedure for cyanation of ketones catalyzed by DMAP (Table 3, entry 3): To a stirred mixture of ketone 8b (0.45 mmol, 1.0 equiv.) and DMAP (5.5 mg, 0.045 mmol, 10 mol %) was added ethyl cyanoformate (3) (0.049 mL, 0.5 mol, 1.1 equiv) at room temperature under argon atmosphere. The mixture was stirred at the same temperature for 24 h. The mixture was purified by column chromatography (silica gel: 6 g, hexane-EtOAc: 4/1) to give the product 9b (88.0 mg, 99% yield) as a colorless oil.
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77954244415
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Pyridine and N,N-dimethylaniline did not promote the cyanation. Therefore, the nucleophilicity of DMAP plays an important role in the cyanation, as observed in DMAP-promoted acylation of alcohols.
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