synthesized through regio- and stereoselective iodo(III)functionalization of alkynes. The combination of chlorobenziodoxole and silver salt has proven to generate a versatile cationic iodine(III) electrophile to activate alkynes and engage various carboxylic acids, triethyl phosphate, and p-toluenesulfonic acid as nucleophiles. The β-iodo(III)enol esters serve as starting materials for the synthesis of multisubstituted
Preparation of <i>N</i>-Alkyl 2-Pyridones via a Lithium Iodide Promoted <i>O</i>- to <i>N</i>-Alkyl Migration: Scope and Mechanism
作者:Sarah Z. Tasker、Michael A. Bosscher、Christina A. Shandro、Erica L. Lanni、Keun Ah Ryu、Gregory S. Snapper、Jarrad M. Utter、Bruce A. Ellsworth、Carolyn E. Anderson
DOI:10.1021/jo3015424
日期:2012.9.21
An efficient and inexpensive LiI-promoted O- to N-alkyl migration of 2-benzyloxy-, 2-allyloxy-, and 2-propargyloxypyridines and heterocycles is reported. The reaction produces the corresponding N-alkyl 2-pyridones and analogues under green, solvent-free conditions in good to excellent yields (30 examples, 20–97% yield). This method has been shown to be intermolecular and requires heat and lithium cation
Au(III)-Catalyzed Tandem Amination–Hydration of Alkynes: Synthesis of α-(<i>N</i>-2-Pyridonyl)ketones
作者:Nathan A. Romero、Benjamin M. Klepser、Carolyn E. Anderson
DOI:10.1021/ol203398e
日期:2012.2.3
reaction has been discovered, leading to the formation of α-(N-2-pyridonyl)ketones and heterocyclic analogues in good to excellent yields (14 examples, 48–90%). This reaction demonstrates the unusual use of a heterocyclic sp2 nitrogen nucleophile in a gold-catalyzed 6-endo-dig cyclization. The tandem process allows rapid access to α-(N-2-pyridonyl)ketones, making them a convenient building block for the synthesis
已经发现了一种新的Au(III)催化的串联胺化-水合反应,导致形成α-(N -2-吡啶基)酮和杂环类似物,产率高至优异(14例,48-90%)。该反应表明杂环sp 2氮亲核试剂在金催化的6- end - dig环化反应中的异常使用。串联过程允许快速获得α-(N -2-吡啶基)酮,这使其成为合成更复杂的N-烷基吡啶酮靶标的便捷组成部分。
Catalytic <i>O</i>
- to <i>N</i>
-Alkyl Migratory Rearrangement: Transition Metal-Free Direct and Tandem Routes to <i>N</i>
-Alkylated Pyridones and Benzothiazolones
作者:Abhishek Kumar Mishra、Nelson Henrique Morgon、Suparna Sanyal、Aguinaldo Robinson de Souza、Srijit Biswas
DOI:10.1002/adsc.201800664
日期:2018.10.18
The present study reports the synthesis of N‐alkylated pyridones and benzothiazolones via O‐ to N‐alkyl group migration under transition metal‐free TfOH‐catalyzed reaction conditions for the first time, to the best of our knowledge. Primary as well as secondary alkyl groups smoothly migrate under the present reaction conditions. Moreover, a minor modification of the protocol used in this study is found
Synthesis of <i>N</i>-Alkenyl 2-Pyridonyl Ethers via a Au(I)-Catalyzed Rearrangement of 2-Propargyloxypyridines
作者:Evan O. Romero、Connor P. Reidy、Andrea N. Bootsma、Noah M. PreFontaine、Nicholas W. Vryhof、David C. Wierenga、Carolyn E. Anderson
DOI:10.1021/acs.joc.6b02075
日期:2016.10.21
2-pyridonyl ethers are formed reversibly in the transformation. After extensive optimization, biaryl Au(I) catalyst 21 was found to overcome the inherentpreference for the 6-endo pathway and provide the highest combination of 5-exo selectivity and yield. Herein, we report the application of this new Au(I)-catalyzed C-N bond formation to the preparation of a variety of N-alkenyl 2-pyridonyl ether analogues