Haag R, Zuber R, Donon S, Lee CH, Noltemeyer M, Johnsen K, de Meijere A. Highly Exo-Selective Epoxidation and Hydroxylation of Triquinacene and Its Derivatives: all-exo-Hexahydroxytriquinane.
J Org Chem 1998;
63:2544-2547. [PMID:
11672117 DOI:
10.1021/jo971796w]
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Abstract
Epoxidation of triquinacene 3 with dimethyldioxirane proceeded with a high degree of exo-face selectivity to give a quantitative yield of a 1:1.5 mixture of all-exo-4a and endo,exo,exo-triepoxytriquinane 4b. Subsequent lithium aluminum hydride reduction of the all-exo-triepoxide 4a gave all-exo-2,5,8-5a and all-exo-2,5,9-trihydroxytriquinane 5b, respectively. The straightforward 3-fold dihydroxylation of triquinacene 3 led exclusively to the all-exo-hexahydroxytriquinane 8 in one step. X-ray crystal structure analyses confirmed the configuration of the triepoxide 4b and the hexaacetate 9 of the hexol 8.
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