title: Unexpected stereochemistry in the lithium salt catalyzed ring expansion of nonracemic oxaspiropentanes. formal syntheses of (-)-(4R,5R)-muricatacin and the pheromone (R)-japonilure.
abstract: [reaction: see text] The stereochemistry of the cyclobutanones 3, obtained by lithium salt catalyzed ring expansion of the optically pure oxaspiropentanes 2, depends not only on the lithium salt but also on the stereochemistry of 2. They constitute the starting material for the syntheses of the acetogenin (-)-(4R,5R)-muricatacin and the pheromone (R)-japonilure.
authors.affiliation: Dipartimento di Scienze Chimiche, Università degli studi di Cagliari, Cittadella Universitaria di Monserrato, S.S 554, Bivio per Sestu, I-09042 Monserrato, Cagliari, Italy. pppiras@unica.it
authors.forename: Angela M
authors.initials: AM
authors.lastname: Bernard
authors.forename: Angelo
authors.initials: A
authors.lastname: Frongia
authors.forename: Pier P
authors.initials: PP
authors.lastname: Piras
authors.forename: Francesco
authors.initials: F
authors.lastname: Secci