Bernard AM, Frongia A, Piras PP, Secci F. Unexpected stereochemistry in the lithium salt catalyzed ring expansion of nonracemic oxaspiropentanes. formal syntheses of (-)-(4R,5R)-muricatacin and the pheromone (R)-japonilure.
Org Lett 2003;
5:2923-6. [PMID:
12889909 DOI:
10.1021/ol035061r]
[Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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.
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