Oxidation of the enol diphenylphosphate ester derived from a 3-substituted 2,4,4-trimethylcyclohex-2-en-1-one by the CrO3-DMP reagent affords in high yield the cross-conjugated dienone 8. The same dienone can be obtained from safranal derivative 10 by reaction with the same reagent.
Synthesis of functionalized ring a building blocks for taxoids
作者:Michael W. Tjepkema、Peter D. Wilson、Timothy Wong、Miguel A. Romero、Hélène Audrain、Alex G. Fallis
DOI:10.1016/0040-4039(95)01244-c
日期:1995.8
The synthesis of a series of oxygenated cyclohexenes 1, 2, 11, 14, 18, and 19 that possess suitable functionality for further elaboration for taxoid synthesis is described. These compounds have been prepared from beta-ionone by a series of oxidative and addition reactions or alternatively by a Lewis acid catalyzed intermolecular Diels-Alder reaction in which the A-ring is constructed directly.