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 mediumJitender M. Khurana, Pooja Saluja, Bhaskara Nand|Tetrahedron|2010Cited by 379
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