布朗斯台德酸与原位生成的2-Methide-2 H-吲哚催化环酰胺的[3 + 2]-环加成反应:吲哚[1,2- a ]吲哚的对映选择性合成
摘要:
公开了向吲哚[1,2- a ]吲哚的高度非对映和对映选择性合成的有效形式[3 + 2]-环加成反应。手性BINOL衍生的磷酸催化环烯酰胺的高对映选择性共轭加成反应,使其原位生成2-甲基2 H-吲哚并随后进行醛化,生成带有3个连续氨基酸的乙酰胺取代的吲哚[1,2- a ]吲哚立体定向中心。重要的是,这些产物形成为单一非对映异构体,并具有优异的产率和对映选择性。在环境温度下温和的反应条件,对乙酰氨基基团的轻松除去以及放大的可能性凸显了该方法的实用性。
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。
Substrate-controlled divergent synthesis of polycyclic indoloazepines and indolodiazepines <i>via</i> 1,5-hydride shift/7-cyclization cascades
作者:Siyuan Liu、Jingping Qu、Baomin Wang
DOI:10.1039/c8cc03804j
日期:——
Novel and practical acid-catalyzed cyclization of 2-indolyl aryl carbinols via tandem dehydration/1,5-hydride shift/7-cyclization sequences has been developed. By appropriate variation of the substrate, diverse polycyclic-fused indoles were synthesized in good yield, thus demonstrating the high efficiency, transition-metal-free nature, and high step/atom economy of the synthesis strategy.
Brønsted Acid Catalyzed [3 + 2]-Cycloaddition of Cyclic Enamides with <i>in Situ</i> Generated 2-Methide-2<i>H</i>-indoles: Enantioselective Synthesis of Indolo[1,2-<i>a</i>]indoles
作者:Kalisankar Bera、Christoph Schneider
DOI:10.1021/acs.orglett.6b02898
日期:2016.11.4
An efficient formal [3 + 2]-cycloaddition toward the highly diastereo- and enantioselectivesynthesis of indolo[1,2-a]indoles is disclosed. A chiral BINOL-derived phosphoric acid catalyzed the highly enantioselective conjugate addition of cyclic enamides to in situ generated 2-methide-2H-indoles and subsequent aminalization to give rise to acetamide-substituted indolo[1,2-a]indoles carrying three contiguous
公开了向吲哚[1,2- a ]吲哚的高度非对映和对映选择性合成的有效形式[3 + 2]-环加成反应。手性BINOL衍生的磷酸催化环烯酰胺的高对映选择性共轭加成反应,使其原位生成2-甲基2 H-吲哚并随后进行醛化,生成带有3个连续氨基酸的乙酰胺取代的吲哚[1,2- a ]吲哚立体定向中心。重要的是,这些产物形成为单一非对映异构体,并具有优异的产率和对映选择性。在环境温度下温和的反应条件,对乙酰氨基基团的轻松除去以及放大的可能性凸显了该方法的实用性。
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