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Expeditious Synthesis of the Aromatic Spiroketal Skeleton Using Hetero--Diels-Alder Cycloaddition. -The method allows the rapid synthesis of [6,6] aromatic spiroketal skeletons, present in various antibiotics. -(ZHOU, G.; ZHENG, D.; DA, S.; XIE*, Z.; LI, Y.; Tetrahedron Lett. 47 (2006) 20, 3349-3352; State Key Lab.

FeCl 3 -Promoted One-Step Synthesis of Spiro[4.5]decane Derivatives. -Dehydration of various cyclopentanol substrates followed by Prins cyclization affords the desired structural units with a high level of diastereoselectivity. -(ZHENG, D.; MA, Z.; GONG, W.; XIE*