γ-Alkylidene butenolides bearing a deoxyriboside, a
steroid, and a metallocene moiety were synthesized by stereoselective sequential
cross-coupling lactonization procedure from the corresponding functionalized
terminal alkynes with 3-iodopropenoic acids. The high
selectivity of the butenolide ring formation was secured by the
Pd/Cu salt ratio. The resulting compounds were tested for
antifungal and cytostatic properties. Most notably, γ-alkylidene butenolides
bearing deoxyriboside moiety showed promising cytostatic activity
in the micromolar range.
cross-coupling - lactones - catalysis - antitumor
agents - palladium