Brønsted Acid Catalyzed [3+2]-Cycloaddition of 2-Vinylindoles with In Situ Generated 2-Methide-2<i>H</i>-indoles: Highly Enantioselective Synthesis of Pyrrolo[1,2-<i>a</i>]indoles
作者:Kalisankar Bera、Christoph Schneider
DOI:10.1002/chem.201601020
日期:2016.5.17
Pyrrolo[1,2‐a]indoles are privileged structural elements of many natural products and pharmaceuticals. An efficient one‐step process for their highly diastereo‐ and enantioselective synthesis, comprising a direct [3+2]‐cycloaddition, has been developed. A chiral BINOL‐derived phosphoric acid catalyzes the reaction of in situ‐generated 2‐methide‐2H‐indoles with 2‐vinylindoles, furnishing the target
吡咯并[1,2- a ]吲哚是许多天然产物和药物的特权结构要素。已经开发出一种高效的一步法,用于其高度非对映和对映选择性的合成,包括直接的[3 + 2]-环加成反应。手性BINOL衍生的磷酸催化原位生成的2-甲基-2 H-吲哚与2-乙烯基吲哚的反应,为目标产物提供了三个连续的立体异构中心作为单一非对映异构体,并具有出色的收率和对映选择性。