A simple, efficient and cost-effective method for the synthesis of octahydroquinazolinone and 1,8-dioxo-octahydroxanthene derivatives by a one-pot cyclocondensation of dimedone and aldehydes, with and without urea or thiourea respectively in the presence of Trimethylsilyl chloride (TMSCl) in MeCN/DMF has been described.
An efficient method has been developed for the synthesis of Garcia Gonzalez polyhydroxyalkyl-and C-glycosylfurans in excellent yields from unprotected sugar aldoses with b-keto esters by Knoevenagel condensation in the presence of anhydrous iron(III) chloride.
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