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.
Stereoselective total synthesis of the C(40)-diacetylenic carotenoid alloxanthin (1) and the C(31)-acetylenic apocarotenoid triophaxanthin (2) was accomplished by Wittig condensation of C(10)-dialdehyde 20 or C(16)-keto aldehyde 19, respectively, with C(15)-acetylenic tri-n-butylphosphonium salt 12.
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