Abstract
Clementein ( 1) and clementein B ( 2), sesquiterpene lactones with an 11,13-oxetane ring isolated from Centaurea clementei Boiss, have been synthesized from the α, β-unsaturated γ-lactone cynaropicrin ( 6). Conjugated photoaddition, stereoselective α-hydroxylation and mild cyclization to form the oxetane ring using THP as leaving group have been employed in this transformation.
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