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Volumn 17, Issue 4, 2006, Pages 267-271

Rapid and cleaner synthesis of 1,4-dihydropyridines in aqueous medium

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSTS; DERIVATIVES; IRRADIATION; MICROWAVES; RECYCLING; SEPARATION; SOLUBILITY; SOLUTIONS;

EID: 33744490093     PISSN: 10427163     EISSN: 10981071     Source Type: Journal    
DOI: 10.1002/hc.20197     Document Type: Article
Times cited : (38)

References (37)
  • 5
    • 0004252595 scopus 로고    scopus 로고
    • Grieco, P. A. (Ed.); Blackie Academic & Professional: London
    • Kobayashi, S. In Organic Synthesis in Water; Grieco, P. A. (Ed.); Blackie Academic & Professional: London, 1998.
    • (1998) Organic Synthesis in Water
    • Kobayashi, S.1
  • 36
    • 33744475517 scopus 로고    scopus 로고
    • note
    • 2 complex in 20 mL of double distilled water and 5 mL of absolute ethanol (Scheme 1). The reaction mixture was taken in an open Erlenmeyer flask and irradiated using a household microwave oven (model: IFB 17PM 1S) with a power range of 200 W (≈75°C) and a pulse of 10 s. The progress of the reaction was monitored by TLC (silica gel precoated plate, eluent:n-hexane to ethyl acetate ratio = 80:20) up to disappearance of reactants. After completion of the reaction, the mixture was kept at 10-15°C for 24 h. The product slowly crystallized from aqueous phase and it was separated by simple nitration. The purification step was not required as the product was in pure form. The above-mentioned procedure was followed for all other reactions. The reaction time and yield for all the reactions are given in Table 1.
  • 37
    • 33744491451 scopus 로고    scopus 로고
    • note
    • Catalyst Recycling Studies. 2-Furfuraldehyde (5 mmol), acetylacetone (11 mmol), and ammonium acetate (10 mmol) were thoroughly mixed with catalyst (0.2 mmol). The progress of reaction was monitored by TLC analysis. After completion of reaction, the reaction mixture was diluted with dichloromethane and recovered the catalyst by simple separation from aqueous phase and organic phase. The catalyst present in aqueous medium was used for the subsequent cycle. The same procedure was adopted for all recycling studies. The reaction time and yield for different cycles are presented in Table 2.


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