Solvent-free synthesis of N-sulfonylimines using microwave irradiation

Tetrahedron Letters

Volumn 40, Issue 27, 1999, Pages 4951-4954

  Vass, András ^a   Dudás, József ^a   Varma, Rajender S ^b  

^a UNIVERSITY OF PANNONIA   (Hungary)

^b SAM HOUSTON STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ALDEHYDE; CALCIUM CARBONATE; IMINE; MONTMORILLONITE; REAGENT; SOLVENT; SULFONAMIDE; SULFONYLIMINE DERIVATIVE; UNCLASSIFIED DRUG;

ARTICLE; MICROWAVE RADIATION; REACTION ANALYSIS; SYNTHESIS; THERMAL EXPOSURE;

EID: 0033516602     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(99)00867-9     Document Type: Article

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48. General procedure: aromatic aldehydes (10 mmol) and trimethylorthoformate (20 mmol) was added to a mixture of sulfonamide (10 mmol), finely powdered calcium carbonate (9 g) and K 10 clay (2 g). The solid homogenized mixture was placed in a modified reaction tube which was connected to a removable cold finger and sample collector to trap the ensuing methanol and methylformate. The reaction tube is inserted into Maxidigest MX 350 (Prolabo) microwave reactor equipped with a rotational mixing system. After irradiation for a specified period (see Table 1), the contents were cooled to room temperature and mixed thoroughly with ethylacetate (2x20 mL). The solid inorganic material was filtered off and solvent was evaporated to afford the residue which was crystallized from the mixture of hexane and ethylacetate.
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