Gold-Catalyzed Tandem Intramolecular Heterocyclization/Petasis-Ferrier Rearrangement of 2-(Prop-2-ynyloxy)benzaldehydes as an Expedient Route to Benzo[b]oxepin-3(2 H)-ones
作者:Ella Min Ling Sze、Weidong Rao、Ming Joo Koh、Philip Wai Hong Chan
DOI:10.1002/chem.201003096
日期:2011.2.1
The golden ring: A synthetic approach to benzo[b]oxepin‐3(2 H)‐ones by heterocyclization/Petasis–Ferrier rearrangement of 2‐(prop‐2‐ynyloxy)benzaldehydes is reported. Uniquely, the ring formation was found to only proceed efficiently in the presence of a gold catalyst. Substitution at the position ortho to the ethereal group on the salicylaldehyde ring was shown to dramatically enhance reactivity (see
金环:通过2-(prop-2-ynyloxy)苯甲醛的杂环化/ Petasis-Ferrier重排,合成了苯并[ b ] oxepin-3(2 H)-ones的合成方法。独特地,发现仅在金催化剂存在下成环有效地进行。显示在水杨醛环上的醚基的邻位取代可显着增强反应性(见图)。