Synthesis of the carbon skeleton of the griseorhodins

Total Synthesis of the Resorcyclic Acid Lactone Spiroketal Citreoviranol

The first total synthesis of resorcyclic acid lactone spiroketal citreoviranol (1) is described. The synthesis was completed in nine steps and via Sonogashira cross-coupling, gold-catalyzed cyclization, and an unusual base-induced ketalization. The relative and absolute stereochemistry of citreoviranol was unambiguously confirmed using 2D NMR spectroscopy and X-ray crystallography.

Isolation, biological activity, biosynthesis and synthetic studies towards the rubromycin family of natural products

The rubromycins are a unique family of natural products. This review covers their isolation, biological activity, biosynthesis and a detailed discussion of the diverse chemistry employed for total synthesis.