Microwave-Assisted Synthesis of Substituted Tetrahydropyrans Catalyzed by ZrCl<sub>4</sub> and Its Application in the Asymmetric Synthesis of <i>exo</i>- and <i>endo</i>-brevicomin
作者:Surendra Singh、Patrick J. Guiry
DOI:10.1021/jo901019u
日期:2009.8.7
ZrCl4-catalyzed deprotection of 1,3-dioxane/dioxalane and the simultaneous formation of 6-methoxy-substituted tetrahydropyrans proceeded under microwave irradiation in good yield. This synthetic methodology was used for the asymmetric synthesis of (+)-exo- and (+)-endo-brevicomin in 55% overall yield over 4 steps.
在微波辐射下,ZrCl 4催化的1,3-二恶烷/二恶烷的脱保护以及6-甲氧基取代的四氢吡喃的同时形成以良好的产率进行。该合成方法用于(+)- exo-和(+)-内切-brevicomin的不对称合成,在4个步骤中总产率为55%。