Photochemical Access to Tetra- and Pentacyclic Terpene-like Products from R-(+)-Sclareolide

Fused tetracyclic oxetanes 4, highly substituted cyclobutenes 6, and the pentacyclic derivatives 7 and 8 were obtained by irradiation of derivatives 3 that were prepared from commercial R-(+)-sclareolide (1) in three steps. Compounds 4 are formed through a Paterno−Büchi reaction, while tricyclic der...

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