Rhodium-Catalyzed NH Insertion of Pyridyl Carbenes Derived from Pyridotriazoles: A General and Efficient Approach to 2-Picolylamines and Imidazo[1,5-<i>a</i>]pyridines
作者:Yi Shi、Anton V. Gulevich、Vladimir Gevorgyan
DOI:10.1002/anie.201408335
日期:2014.12.15
A general and efficientNHinsertion reaction of rhodium pyridylcarbenesderivedfrompyridotriazoles was developed. Various NH‐containing compounds, including amides, anilines, enamines, and aliphatic amines, smoothly underwent the NHinsertion reaction to afford 2‐picolylamine derivatives. The developed transformation was further utilized in a facile one‐pot synthesis of imidazo[1,5‐a]pyridines.
Synthesis of 1,2-Benzothiazines by a Rhodium-Catalyzed Domino C–H Activation/Cyclization/Elimination Process from<i>S</i>-Aryl Sulfoximines and Pyridotriazoles
作者:Woo Hyung Jeon、Jeong-Yu Son、Ji Eun Kim、Phil Ho Lee
DOI:10.1021/acs.orglett.6b01750
日期:2016.7.15
2-benzothiazines bearing pyridyl as well as carbonyl groups is developed from rhodium-catalyzed carbene insertions into aromatic C–H bonds of S-aryl sulfoximines using pyridotriazoles by denitrogenative cyclization followed by the elimination of alcohols. The present method involves the N–H/C–H activation of simple alkyl aryl sulfoximines and has the advantages of a broad substrate scope, high functional
Rhodium(II)‐Catalyzed Formal [4+1]‐Cycloaddition of Pyridotriazoles and Propargyl Alcohols: Synthesis of 2,5‐Dihydrofurans
作者:Xinxin Lv、Haijian Yang、Taoda Shi、Dong Xing、Xinfang Xu、Wenhao Hu
DOI:10.1002/adsc.201801497
日期:2019.3.15
A rhodium‐catalyzed formal [4+1]‐cycloaddition of pyridotriazoles and aryl propargylalcohols is reported, providing an effective access to 2‐pyridyl‐substituted 2,5‐dihydrofuran derivatives in moderate to high yields. Mechanistically, the proposed oxonium ylide intermediate in this catalytic alkyne carbocyclization transformation is verified by an interception experiment for the first time.
Pseudopericyclic Dearomative 1,6-Cyclization of 1-(2-Pyridyl)-2-azabuta-1,3-dienes: Synthesis and Ring-Chain Valence Equilibria of 4<i>H</i>
-Pyrido[1,2-<i>a</i>
]pyrazines
作者:Ilya P. Filippov、Mikhail S. Novikov、Alexander F. Khlebnikov、Nikolai V. Rostovskii
DOI:10.1002/ejoc.202000210
日期:2020.5.22
The 1,6‐electrocyclization of 1‐(2‐pyridyl)‐2‐azabuta‐1,3‐dienes, obtained by RhII‐catalyzed reaction of pyridotriazoles with 2H‐azirines, affords stable non‐aromatic 4H‐pyrido[1,2‐a]pyrazines despite the fact that the reaction proceeds with irreversible dearomatization of the pyridine aromatic system.
通过Rh II催化的吡啶三唑与2 H叠氮基的反应获得的1-(2-吡啶基)-2-azabuta-1,3-二烯的1,6-电环化可提供稳定的非芳族4 H吡啶基[ 1,2- a ]吡嗪,尽管该反应会随着吡啶芳族体系的不可逆脱芳香化而进行。
One-Pot Synthesis of Indolizines via Sequential Rhodium-Catalyzed [2 + 1]-Cyclopropanation, Palladium-Catalyzed Ring Expansion, and Oxidation Reactions from Pyridotriazoles and 1,3-Dienes
作者:Hyunseok Kim、Sanghyuck Kim、Jiyeon Kim、Jeong-Yu Son、Yonghyeon Baek、Kyusik Um、Phil Ho Lee
DOI:10.1021/acs.orglett.7b02826
日期:2017.10.20
synthetic method for producing functionalized indolizine derivatives was developed via a Rh-catalyzed [2 + 1]-cyclopropanation, Pd-catalyzed ring expansion, and subsequent oxidation using manganese dioxide from pyridotriazoles and 1,3-dienes.