Table 2: Synthesis of 2-Amino-4-aryl-3-cyano-5-oxo-4H,5H-pyrano[3,2-c]chromenes in solvent-free neat conditions using DABCO (5 mol%) as catalyst.

EntryArProductTime/minYield/%m.p./°C Found (reported)

1C6H54a3094256-257 (256–258) [15]
24-O2N C6H44b3096259–261 (258–260) [15]
33-O2N C6H44c3093261–263 (262–264) [15]
44-ClC6H44d3092264–267 (263–265) [15]
54-BrC6H44e3091247–250 (249–251) [15]
64-CH3OC6H44f3089241–244 (240–242) [15]
74-CH3C6H44g3087252–254 (250–252) [15]
82,4-Cl2C6H34h3090256–258 (257–259) [15]
9185120.table.002a4i3097251–254 (252-253) [16]
10185120.table.002b4j3096226–230 (228) [20]