Solvent-free synthesis of 14-aryl(alkyl)-14H-dibenzo[a,j]xanthene, 9-aryl(alkyl)- 3,3,6,6-tetramethyl-3,4,5,6,7,9-hexahydro-2H-xanthene-1,8-dione and 2-Amino- 5,6,7,8-tetrahydro-5-oxo-4-aryl-7,7-dimethyl-4H-benzo-[b]-pyran derivatives using InCl3 as catalyst