Denbinobin was made in seven steps from quinone 3. The cyclization of aldehyde 12 using P-4-tBu and the oxidation of a hindered alcohol with MnO2 were key steps. (C) 2002 Elsevier Science Ltd. All rights reserved.
A totalsynthesis of denbinobin (1) in seven steps with an overall yield of 10% is reported. This synthesis used an FeCl3-assisted cyclization of stilbene to form a phenanthrene. The poor yields of the decarboxylation and methoxylation steps were improved upon to become essentially quantitative. This scalable methodology was carried out using ordinary laboratory reagents.
Synthesis of phenanthrenes from formylbenzoquinone
作者:George A Kraus、Kim Hoover、Ning Zhang
DOI:10.1016/s0040-4039(02)01026-2
日期:2002.7
Phenanthrenes are synthesized by condensation of formylbenzoquinone with a substituted toluene followed by O-methylation and cyclization using the phosphazine base P4-tBu.
通过将甲酰基苯醌与取代的甲苯缩合,然后进行邻甲基化并使用磷嗪碱P 4 - t Bu进行环化反应来合成菲。