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A facile and highly efficient protocol for the synthesis of 1,8-dioxo-octahydroxanthene derivatives was achieved through cascade Knoevenagel-Michael condensations and cyclo-dehydration reaction utilizing tetrachlorosilane(TCS) as catalyst under mild conditions.Reaction of the titled compounds with TCSNaN_3 to give novel functionalized pyrano[3,2-c]tetrazolo[1,5-a]azepine derivatives is also described.
A facile and highly efficient protocol for the synthesis of 1,8-dioxo-octahydroxanthene derivatives was achieved through cascade Knoevenagel-Michael condensations and cyclo-dehydration reaction utilizing tetrachlorosilane (TCS) as catalyst under mild conditions. Reaction of the titled compounds with TCSNaN_3 to give novel functionalized pyrano [3,2-c] tetrazolo [1,5-a] azepine derivatives is also described.