Phosphazene-Base-Catalyzed Tandem Addition-Cyclization Reaction of o-Alkynylbenzaldehyde with Oxygen and Nitrogen Nucleophiles
作者:Masahiro Terada、Chikashi Kanazawa、Akira Ito
DOI:10.1055/s-0028-1087909
日期:2009.3
The tandem addition-cyclization reaction between o-alkynylbenzaldehyde and nucleophile catalyzed by P4- t Bu, a phosphazene base, is demonstrated. The nucleophilic cyclization is efficiently triggered not only by alcohols, including sterically demanding ones, but also by nitrogen nucleophiles, such as amide and pyrrole, under the influence of a catalytic amount of P4- t Bu. The method enables efficient
证明了邻炔基苯甲醛和亲核试剂在磷腈碱 P4-t Bu 催化下的串联加成环化反应。在催化量的 P4-t Bu 的影响下,亲核环化不仅由醇(包括空间要求高的醇)有效触发,而且由含氮亲核试剂(如酰胺和吡咯)有效触发。该方法能够在温和条件下有效获取异苯并呋喃衍生物。