Michael addition of amides to alfa, beta-unsaturated esters efficiently proceed in the presence of K2CO3 and tetrabutylammonium bromide (TBAB) as a phase-transfer catalyst under microwave irradiation to afford N-alkylated amides in high yields and short reaction times.
A simple, low cast and efficient solvent-free procedure for the preparation of bis(in -dolyl)methanes via condensation of indoles with aldehydes as well as ketones in the presence of catalytic amount of magnesium sulfate (MgSO4) is described. The reactions proceed rapidly in high yields at 50°C.
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