SO 4 2-/SnO 2-Catalyzed efficient one-pot synthesis of 7,8-Dihydro-2H-Chromen-5-ones by formal [3+3] cycloaddition and 1,8-Dioxo-octahydroxanthenes via a Knoevenagel condensation
Venugopala R. Narayana, Zubaidha Pudukulathan and Ravi Varala
School of Chemical Sciences, Swami Ramanand Teerth Marathwada University, Nanded, Maharashtra-431 606, India
Department of Chemistry, AP-IIIT Basara, Rajiv Gandhi University of Knowledge Technologies, Mudhole, Adilabad, Andhra Pradesh-504 107, India
Abstract: SO 4 2-/SnO 2-Catalyzed efficient one-pot synthesis of 7,8-dihydro-2H-chromen-5-ones by formal [3+3] cycloaddition and 1,8-dioxo-octahydroxanthenes via a Knoevenagel condensation is described with good yields under mild reaction conditions. The catalyst could be reused several times without loosing its catalytic efficiency.
Keywords: cat. SO 4 2-/SnO 2; α,β-unsaturated aldehydes; cyclic 1,3-diketones; Knoevenagel condensation; reusability. |