One-pot synthesis of N-substituted (3-oxobutanyl)carbamates from primary amines using modified zeolite Hβ at room temperature

Tetrahedron Letters

Volumn 46, Issue 5, 2005, Pages 835-837

  Raje, Vivek P ^a   Bhat, Ramakrishna P ^a   Samant, Shriniwas D ^a  

^a INSTITUTE OF CHEMICAL TECHNOLOGY   (India)

Author keywords

aza Michael addition; Carbamates; H zeolite; Ion exchange

Indexed keywords

AMINE; CARBAMIC ACID DERIVATIVE; FORMIC ACID DERIVATIVE; KETONE; METHYLCHLOROFORMATE; STRONTIUM; UNCLASSIFIED DRUG; ZEOLITE;

ARTICLE; CONJUGATION; ROOM TEMPERATURE; SUBSTITUTION REACTION; SYNTHESIS;

EID: 11844304986     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2004.11.156     Document Type: Article

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30. - ions (tested by silver nitrate). The catalysts were dried at 80°C to obtain Hβ-SnA
31. General procedure for one-pot synthesis: to a mixture of Hβ-SnA (0.2 g, 0.27 mmol of Sn) and methyl chloroformate (5 mmol) in 5 mL of acetonitrile, amine (5 mmol) dissolved in 5 mL of acetonitrile added dropwise. The reaction mixture was stirred at room temperature until the completion of the reaction as indicated by TLC. To the resulting mixture, methyl vinyl ketone (6 mmol) was added and the reaction was stirred until the completion as indicated by TLC. The reaction mixture was filtered and evaporated. The crude product was purified by column chromatography
32. 3: C, 48.02; H, 4.68; Br, 26.51; N, 4.64. Found: C, 48.19; H, 4.65; Br, 26.49; N, 4.63%