期刊
ORGANIC LETTERS
卷 13, 期 20, 页码 5500-5503出版社
AMER CHEMICAL SOC
DOI: 10.1021/ol2022214
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资金
- National Science Foundation [CHE-0806356]
- Robert H. DeWolfe Fellowship
- Direct For Mathematical & Physical Scien [0806356] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0840521] Funding Source: National Science Foundation
- Division Of Chemistry [0806356] Funding Source: National Science Foundation
Total syntheses of two structures purported as (+)-heliananes were completed in six pots. Spectral comparisons, between the synthetic and natural compounds, revealed a misassignment of the eight-membered ring in the heliananes. The key step in the syntheses of the proposed structures and the confirmation of their actual structures was a diastereoselective inverse-demand Diels-Alder reaction between an optically active enol ether and an ortho-quinone methide species, which was generated In situ at low temperature by the sequential addition of methylmagnesium bromide and di-terf-butyl dicarbonate to a salicylaidehyde.
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