title: An unusual ring-contraction/rearrangement sequence for making functionalized di- and triquinanes.
abstract: A novel ring contraction/rearrangement sequence leading to functionalized 2,8-oxymethano-bridged di- and triquinane compounds is observed in the reaction of various substituted 1-methyl-4-isopropenyl-6-oxabicylo[3.2.1]octan-8-ones with Lewis acids. The reaction is novel and is unprecedented for the synthesis of di- and triquinane frameworks.
authors.affiliation: Department of Organic Chemistry, Indian institute of Science, Sir C. V. Raman Av., Bangalore 560 012 (India).
authors.forename: Chinta
authors.initials: C
authors.lastname: Nagaraju
authors.forename: Kavirayani R
authors.initials: KR
authors.lastname: Prasad
keywords: gold; natural products; rearrangement; ring contraction; synthetic methods