Three Lewis acid catalysed reactions used in a synthesis of the tricyclic core of the marine anti-inflammatory pseudopterosins are reported; the reductive cleavage of an oxirane with inversion, the cyclisation of an α-hydroxy ketenedithioacetal to an arene, and a stereoselective annulation using an allylic sulfone as the electrophile.
S. Gill, P. Kocienski, A. Kohler, A. Pontiroli and L. Qun, Chem. Commun., 1996, 1743 DOI: 10.1039/CC9960001743
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