An Interesting Issue of Diels−Alder Selectivity Discovered En Route to 11-<i>O</i>-Debenzoyltashironin
作者:Silas P. Cook、Samuel J. Danishefsky
DOI:10.1021/ol062067i
日期:2006.12.1
Alder cascade was examined in the context of the natural product 11-O-debenzoyltashironin. Interestingly, the regioselectivity of the Diels-Alder reaction can be completely switched by changing the dienophile. Trapping of allyl alcohols during the oxidative dearomatization gives rise to the five-membered acetal, while trapping of allenyl alcohols results in the six-membered acetal. [reaction: see text]
在天然产物11-O-脱苯甲酰tashironin的背景下检查了高价碘介导的氧化脱芳香化/ Diels-Alder级联反应。有趣的是,Diels-Alder反应的区域选择性可以通过改变亲二烯体来完全切换。在氧化脱芳香化过程中捕集烯丙醇会生成五元乙缩醛,而在捕集烯丙醇时会生成六元乙缩醛。[反应:看文字]