The solid-state michael addition of indole to 4-arylidene-3-methyl-5-pyrazolone

The Michael addition reactions of indole to 4-arylidene-3-methyl-1-phenyl-5-pyrazolone 1 were investigated in the solid state, by which a series of new compounds, 1-aryl-1-(3-indolyl)-1-(3′-methyl-1′-phenyl-5′-pyrazolon-4′-yl)methanes 2 , were easily obtained. This provides a feasible method of preparing novel compounds containing two heterocyclic groups at the same carbon.