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The core structure of cristaxenicin A having trans-fused dihydropyran and nine membered ring has been synthesized and evaluated the antileishmanial activity. The dihydropyran ring was synthesized by [4+2] cycloaddition reaction between an unsaturated aldehyde and a β-alkoxy-α,β-unsaturated ketone. The nine membered ring possessing α,β-unsaturated aldehyde was constructed by the intramolecular NHK...
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