A stereoselective three-component reaction: KAl(SO4)2.12H2O, an efficient and reusable catalyst for the one-pot synthesis of cis-isoquinolonic acids.

KAl(SO(4))(2).12H(2)O is found to catalyze efficiently the stereoselective one-pot three-component cyclocondensation of homophthalic anhydride, aldehydes, and amines under mild conditions to afford the corresponding cis-isoquinolonic acids in good yields.

A novel one-pot, four component synthesis of some densely functionalized pyrroles.

A new one-pot four component procedure for synthesis of densely functionalized pyrroles using commercially available ninhydrin with phosphorane intermediates produced in the reaction between triphenylphosphine, ammonium thiocyanate (or ammonium acetate) and various dialkyl acetylenedicarboxylates was developed.