Silver and Brønsted Acid Catalyzed Nazarov-Type Cyclizations To Generate Benzofulvenes
作者:Pierre Cordier、Corinne Aubert、Max Malacria、Emmanuel Lacôte、Vincent Gandon
DOI:10.1002/anie.200903675
日期:2009.11.2
Easy as pie: Expedient access to aryl‐substituted benzofulvenes is described. α‐Hydroxyallenes 1 that bear two aryl groups at C1 (red circle) are directly transformed into these products at room temperature by using silver triflate as a catalyst or Brønsted acids. The transformation involves dealkoxylation and subsequent 4π electrocyclization (Nazarov reaction).
简单易用:描述了方便地使用芳基取代的苯并呋喃酮的方法。在室温下,通过使用三氟甲磺酸银作为催化剂或布朗斯台德酸,可将在C1(红色圆圈)带有两个芳基的α-羟基丙二烯1直接转化为这些产物。该转化涉及脱烷氧基化和随后的4π电环化(Nazarov反应)。