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Volumn , Issue 10, 2008, Pages 1539-1542

Dehydrative amination of alcohols in water using a water-soluble calix[4]resorcinarene sulfonic acid

Author keywords

Animations; Calixarenes; Green chemistry; Host guest systems; Phase transfer catalysis

Indexed keywords

ALCOHOL DERIVATIVE; CALIX[4]RESORCINARENE SULFONIC ACID; SULFONIC ACID DERIVATIVE; WATER;

EID: 46449096605     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/S-2008-1078416     Document Type: Article
Times cited : (39)

References (62)
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    • The reactions using simple aliphatic alcohols such as hexanol and cyclohexanol gave no amination product
    • The reactions using simple aliphatic alcohols such as hexanol and cyclohexanol gave no amination product.
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    • General Experimental Procedure for Dehydrative Amination in H2O (Table 2, Alcohol (0.30 mmol) andp-toluenesulfonamide (0.45 mmol) were added to a solution of water-soluble calix[4]resorcinarene sulfonic acid I1320 (0.030 mmol) in H2O (1 mL) with stirring, and the reaction mixture was vigorously stirred at 60°C for an additional 24 h. After the addition of sat. aq NaHCO3 solution (3 mL, the resulting mixture was extracted with EtOAc (3×3 mL, The combined extracts were dried over anhyd Na2SO4 and evaporated. The products were purified by flash chromatography on silica gel to yield the amination product. Recycling Experiments (Table 3, Alcohol (0.90 mmol) and/7-toluenesulfonamide (1.08 mmol) were added to a solution of water-soluble calix[4]resorcinarene sulfonic acid 1 (0.090 mmol) in H2O (3 mL) with stirring, and the reaction mixture was vigorously stirred at 60°C for an additional 24 h. After each reaction, EtOAc (3 mL) was added to the reaction mixture
    • General Experimental Procedure for Dehydrative Amination in H2O (Table 2): Alcohol (0.30 mmol) andp-toluenesulfonamide (0.45 mmol) were added to a solution of water-soluble calix[4]resorcinarene sulfonic acid I1320 (0.030 mmol) in H2O (1 mL) with stirring, and the reaction mixture was vigorously stirred at 60°C for an additional 24 h. After the addition of sat. aq NaHCO3 solution (3 mL), the resulting mixture was extracted with EtOAc (3×3 mL). The combined extracts were dried over anhyd Na2SO4 and evaporated. The products were purified by flash chromatography on silica gel to yield the amination product. Recycling Experiments (Table 3): Alcohol (0.90 mmol) and/7-toluenesulfonamide (1.08 mmol) were added to a solution of water-soluble calix[4]resorcinarene sulfonic acid 1 (0.090 mmol) in H2O (3 mL) with stirring, and the reaction mixture was vigorously stirred at 60°C for an additional 24 h. After each reaction, EtOAc (3 mL) was added to the reaction mixture, and the solution was stirred for 5 min. The resulting mixture was allowed to stand for 5 min and then the organic phase was removed via a syringe. This extraction procedure was repeated twice. The remaining aqueous catalyst solution was reused directly in the next cycle. Isolation of the amination product 2a was performed in a manner similar to that described above.


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