Alternative Spiroketalization Methods toward Purpuromycin: A Diketone Approach To Prevent Benzofuran Formation
摘要:
The central portion of purpuromycin has been assembled via a classical spiroketalization reaction. Key to promoting this reaction mode versus benzofuran formation was the oxidation state of the spiroketal core. With a higher oxidation state, even the electron-deficient isocoumarin found in purpuromycin could be employed directly in the spiroketalization. The two halves of the spiroketalization precursor were joined via a nitrile oxide/styrene 1,3-dipolar cycloaddition. A very mild selenium dioxide oxidation was used to introduce the required oxidation state of the spiroketal core.
A Concise Synthesis of the Naphthalene Portion of Purpuromycin
作者:Andrew N. Lowell、Michael W. Fennie、Marisa C. Kozlowski
DOI:10.1021/jo7024114
日期:2008.3.1
A concise synthesis of naphthalene compounds for incorporation into a synthetic sequence for the rubromycin family of natural products is presented. These highly substituted naphthalenes are generated in seven and nine steps, respectively, from 2,4,5-trimethoxybenzaldehyde. Three ring-forming methods were explored and the controlled oxygenation of different positions was investigated to yield differentially
Alternative Spiroketalization Methods toward Purpuromycin: A Diketone Approach To Prevent Benzofuran Formation
作者:Andrew N. Lowell、Michael W. Fennie、Marisa C. Kozlowski
DOI:10.1021/jo200399z
日期:2011.8.19
The central portion of purpuromycin has been assembled via a classical spiroketalization reaction. Key to promoting this reaction mode versus benzofuran formation was the oxidation state of the spiroketal core. With a higher oxidation state, even the electron-deficient isocoumarin found in purpuromycin could be employed directly in the spiroketalization. The two halves of the spiroketalization precursor were joined via a nitrile oxide/styrene 1,3-dipolar cycloaddition. A very mild selenium dioxide oxidation was used to introduce the required oxidation state of the spiroketal core.