Manganese catalyzed C–H functionalization of indoles with alkynes to synthesize bis/trisubstituted indolylalkenes and carbazoles: the acid is the key to control selectivity
作者:Lijun Shi、Xiang Zhong、Houde She、Ziqiang Lei、Fuwei Li
DOI:10.1039/c5cc00249d
日期:——
The Mn-catalyzed C–H alkenylations of indole with terminal- and/or internal-alkynes have been developed to selectively yield indolylalkene and carbazole.
锰催化的C-H烯基化反应可以选择性地将吲哚与末端和/或内部炔烃反应,生成吲哚烯和咔唑。
C-2 side chain alkylation of 2-methyl-3-alkylindoles via 3-methoxyindolenines:
作者:Susan F. Vice、Edward A. Gross、Richard W. Friesen、Gary I. Dmitrienko
DOI:10.1016/s0040-4039(00)86960-9
日期:1982.1
3-Methoxyindolenines derived from 2-methyl-3-alkylindoles by bromination-methanolysis undergo base induced alkylations and aldol condensations at the C-2 methyl group. The modified indolenines can be efficiently converted to C-2-sides chain alkylated indoles by reduction with lithium-aluminum hydride or zinc.
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。
Catalytic Asymmetric Inverse-Electron-Demand Oxa-Diels-Alder Reaction of In Situ Generated<i>ortho</i>-Quinone Methides with 3-Methyl-2-Vinylindoles
作者:Jia-Jia Zhao、Si-Bing Sun、Sai-Huan He、Qiong Wu、Feng Shi
DOI:10.1002/anie.201500215
日期:2015.4.27
The first catalytic asymmetric inverse‐electron‐demand (IED) oxa‐Diels–Alderreaction of ortho‐quinone methides, generated in situ from ortho‐hydroxybenzyl alcohols, has been established. By selecting 3‐methyl‐2‐vinylindoles as a class of competent dienophiles, this approach provides an efficient strategy to construct an enantioenriched chroman framework with three adjacent stereogenic centers in high
Brønsted Acid Catalyzed [6 + 2]-Cycloaddition of 2-Vinylindoles with in Situ Generated 2-Methide-2<i>H</i>-pyrroles: Direct, Catalytic, and Enantioselective Synthesis of 2,3-Dihydro-1<i>H</i>-pyrrolizines
作者:Isa Kallweit、Christoph Schneider
DOI:10.1021/acs.orglett.8b03833
日期:2019.1.18
We describe herein an organocatalytic, diastereo- and enantioselective [6 + 2]-cycloaddition toward the synthesis of densely substituted 2,3-dihydro-1H-pyrrolizines bearing three contiguous stereogenic centers which are obtained with good yields, as single diastereomers, and with excellent enantioselectivity. A crucial feature of this one-step process leading to a prominent structural motif in many