One-Pot Procedure for the Synthesis of Unsymmetrical Diarylalkynes
摘要:
Unsymmetrical diarylalkynes are accessible by a one-pot procedure from two different aryl halides and (trimethylsilyl)acetylene. The three-component coupling is initialized by a Pd/Cu-catalyzed Sonogashira coupling of an aryl halide with (trimethylsilyl)acetylene. After subsequent desilylation Ilk; formed aryl(trimethylsilyl)acetylene with aqueous potassium hydroxide, a second Sono-gashira coupling with an aryl iodide that does not require any additional Pd/Cu-catalyst gives access to an unsymmetrical diarylalkyne.
Synthesis of 1-Cyano-3-acylnaphthalenes via Formal [4+2] Benzannulation of 2-(2-Alkynylphenyl)acetonitriles and Alkynones
作者:Lu-Lu Chen、Jing-Wen Zhang、Wan-Wan Yang、Ji-Ya Fu、Jun-Yan Zhu、Yan-Bo Wang
DOI:10.1021/acs.joc.9b00948
日期:2019.6.21
of 1-cyano-3-acylnaphthalenes from 2-(2-alkynylphenyl)acetonitriles and alkynones throughsequential C–C bond coupling has been developed. This protocol is characterized by mild conditions, excellent functional group tolerance, complete regioselectivity, and atom economy. The plausible mechanism, gram-scale synthesis, and further transformations of the product were studied.
A Copper-Catalyzed Cascade Approach for the Synthesis of Dibenzo[<i>b,f</i>
]1,8-naphthyridine Derivatives
作者:Bharath Kumar Villuri、Ashok Konala、Veerababurao Kavala、Trimurtulu Kotipalli、Chun-Wei Kuo、Ching-Fa Yao
DOI:10.1002/adsc.201700546
日期:2017.9.18
The synthesis of some dibenzo[b,f]‐[1,8]naphthyridine derivatives in a cascade manner is reported. The reaction includes a Knovenagel condensation, the insertion of a nitrile and an alkyne into an N–H bond and an oxidation/oxidative C–C bond cleavage sequence in the presence of copper iodide. The key 1,8‐naphthyridine core was constructed in a cascade manner during the course of the reaction itself
Palladium‐Catalyzed Tandem Cyclization of 2‐(2 Ethynylphenyl)acetonitriles and Isocyanides: Access to Indeno[2,1‐
<i>b</i>
]pyrroles
作者:Hui‐Shu Lin、Yong‐Zhou Pan、Yu‐Hong Tian、Ying‐Ming Pan、Xu Wang
DOI:10.1002/adsc.202101311
日期:2022.3.15
A palladium-catalyzed tandem cyclization of 2-(2-ethynylphenyl)acetonitriles with isocyanides has been developed. Various indeno[2,1-b]pyrroles were prepared in 55%–82% yields under air atmosphere at 100 °C. The key to the success of this protocol is construction of new C−C and C−N bonds via the orderly insertion of isocyanides.
已开发出钯催化的 2-(2-乙炔基苯基) 乙腈与异氰化物的串联环化反应。各种茚并[2,1- b ]吡咯在 100 °C 空气气氛下以 55%–82% 的产率制备。该协议成功的关键是通过有序插入异氰化物来构建新的 C-C 和 C-N 键。
Base-Promoted (5 + 2) Annulation between 2-(Alkynylaryl)acetonitriles and Arylalkynes for the Synthesis of Benzocycloheptene Derivatives
Herein, we describe a novel approach to the synthesis of benzocycloheptene derivatives via base-promoted (5 + 2) annulation between 2-(alkynylaryl)acetonitriles and arylalkynes. In this chemistry, 2-(alkynylaryl)acetonitriles are employed as a new C5 synthon to construct various benzocycloheptene(s) derivatives by building two C–C bonds in one single step. This method features excellent regioselectivity