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DBU: a highly efficient catalyst for one-pot synthesis of substituted 3,4-dihydropyrano[3,2-c]chromenes, dihydropyrano[4,3-b]pyranes, 2-amino-4H-benzo[h]chromenes and 2-amino-4H benzo[g]chromenes in aqueous mediumKHURANA, Jitender M; NAND, Bhaskara; SALUJA, Pooja et al.Tetrahedron (Oxford. Print). 2010, Vol 66, Num 30, issn 0040-4020, 5510, 5637-5641 [6 p.]Article