1
|
Alikhani Z, Albertson AG, Walter CA, Masih PJ, Kesharwani T. Synthesis of Benzo[ b]thiophenes via Electrophilic Sulfur Mediated Cyclization of Alkynylthioanisoles. J Org Chem 2022; 87:6312-6320. [PMID: 35436400 DOI: 10.1021/acs.joc.1c02606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A stable dimethyl(thiodimethyl)sulfonium tetrafluoroborate salt was employed for the electrophilic cyclization reaction of o-alkynyl thioanisoles for the synthesis of 2,3-disubstituted benzo[b]thiophenes. The reaction described herein works well with various substituted alkynes in excellent yields, and a valuable thiomethyl group was introduced with ease. The reaction utilizes moderate reaction conditions and ambient temperature while tolerating various functionalities. To elucidate the mechanism, electrophilic addition reactions using the dimethyl(thiodimethyl)sulfonium tetrafluoroborate salt with diphenylacetylene was demonstrated.
Collapse
Affiliation(s)
- Zahra Alikhani
- Department of Chemistry, University of West Florida, 11000 University Pkwy, Pensacola, Florida 32514, United States
| | - Alyssa G Albertson
- Department of Chemistry, University of West Florida, 11000 University Pkwy, Pensacola, Florida 32514, United States
| | - Christopher A Walter
- Department of Chemistry, University of West Florida, 11000 University Pkwy, Pensacola, Florida 32514, United States
| | - Prerna J Masih
- Department of Biology, University of West Florida, 11000 University Pkwy, Pensacola, Florida 32514, United States
| | - Tanay Kesharwani
- Department of Chemistry, University of West Florida, 11000 University Pkwy, Pensacola, Florida 32514, United States
| |
Collapse
|
2
|
Silica gel-assisted synthesis of benzo[b]thiophenes from o-(alkylsulfanyl)(ethynyl)benzenes. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
|
3
|
Luo S, Peng M, Querard P, Li CC, Li CJ. Copper-Catalyzed Conjugate Addition of Carbonyls as Carbanion Equivalent via Hydrazones. J Org Chem 2021; 86:13111-13117. [PMID: 34478300 DOI: 10.1021/acs.joc.1c01380] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Copper-catalyzed conjugate addition is a classic method for forming new carbon-carbon bonds. However, copper has never showed catalytic activity for umpolung carbanions in hydrazone chemistry. Herein, we report a facile conjugate addition of hydrazone catalyzed by readily available copper complexes at room temperature. The employment of mesitylcopper(I) and electron-rich phosphine bidentate ligand is a key factor affecting reactivity. The reaction allows various aromatic hydrazones to react with diverse conjugated compounds to produce 1,4-adducts in yields of about 20 to 99%.
Collapse
Affiliation(s)
- Siyi Luo
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysis, McGill University, 801 Sherbrook Street West, Montreal, Quebec H3A 0B8, Canada
| | - Marie Peng
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysis, McGill University, 801 Sherbrook Street West, Montreal, Quebec H3A 0B8, Canada
| | - Pierre Querard
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysis, McGill University, 801 Sherbrook Street West, Montreal, Quebec H3A 0B8, Canada
| | - Chen-Chen Li
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysis, McGill University, 801 Sherbrook Street West, Montreal, Quebec H3A 0B8, Canada
| | - Chao-Jun Li
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysis, McGill University, 801 Sherbrook Street West, Montreal, Quebec H3A 0B8, Canada
| |
Collapse
|
4
|
Zhang Y, Lai W, Zhang L, Gao X, Qiu G, Zhou H. The copper-catalyzed synthesis of ( Z)-2 H-naphtho[1,8- bc]thiophenes with solid emission. Org Biomol Chem 2021; 19:1827-1834. [PMID: 33565557 DOI: 10.1039/d0ob02233k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In recent years, one of the main research interests of our group has been the construction of 6/5 π-systems through the regioselective conversion of parallel alkynes in naphthalene with the aim of exploiting potential fluorescent materials. Herein, the copper-catalyzed synthesis of polysubstituted (Z)-2H-naphtho[1,8-bc]thiophenes from 8-halo-1-ethynylnaphthalenes using potassium ethylxanthate as the sulfur source is reported. In this protocol, a series of thiophene-fused 6/5 π-system compounds was synthesized via copper-catalyzed Ullmann-type C(aryl)-S bond formation and the α-addition of an alkyne bond with high selectivity and in high yields. The synthesized polysubstituted (Z)-2H-naphtho[1,8-bc]thiophenes exhibited solid emission, which made them potential candidates for use in optoelectronic conjugated materials. By using DMSO/D2O (3 : 1) as the reaction solvent, the deuterated products could be obtained in good yields under standard conditions.
Collapse
Affiliation(s)
- Yuan Zhang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
| | - Weiping Lai
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
| | - Lianpeng Zhang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China. and School of Materials Science and Engineering, Southwest Forestry University, Kunming 650224, China.
| | - Xiaoxing Gao
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
| | - Guanyinsheng Qiu
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
| | - Hongwei Zhou
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
| |
Collapse
|
5
|
Cai T, Feng C, Shen F, Bian K, Wu C, Shen R, Gao Y. Synthesis of 2‐Substituted Benzothio(seleno)phenes and Indoles
via
Ag‐Catalyzed Cyclization/Demethylation of 2‐Alkynylthio(seleno)anisoles and 2‐Alkynyldimethylanilines. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001465] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Tao Cai
- Department College of Chemistry and Chemical Engineering Shaoxing University Shaoxing 312000 P. R. China
| | - Chengjie Feng
- Department College of Chemistry and Chemical Engineering Shaoxing University Shaoxing 312000 P. R. China
| | - Fangqi Shen
- Department College of Chemistry and Chemical Engineering Shaoxing University Shaoxing 312000 P. R. China
| | - Kejun Bian
- Department College of Chemistry and Chemical Engineering Shaoxing University Shaoxing 312000 P. R. China
| | - Chunlei Wu
- Department College of Chemistry and Chemical Engineering Shaoxing University Shaoxing 312000 P. R. China
| | - Runpu Shen
- Department College of Chemistry and Chemical Engineering Shaoxing University Shaoxing 312000 P. R. China
| | - Yuzhen Gao
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 P. R. China
| |
Collapse
|
6
|
Le Q, Dillon CC, Lichtenstein DA, Pisor JW, Closser KD, Muchalski H. Gold(I)-NHC-catalysed synthesis of benzofurans via migratory cyclization of 2-alkynylaryl ethers. Org Biomol Chem 2020; 18:8186-8191. [PMID: 33026395 DOI: 10.1039/d0ob01538e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Homogeneous cationic gold(i) catalysis emerged as a preferred avenue for the activation of alkenes and alkynes towards reactions with weak nucleophiles, especially in cyclization reactions. Here we report an intramolecular carboalkoxylation reaction of electron-rich benzyl ethers of 2-ethynylaryl phenols catalysed by a digold(i)-NHC complex. The reaction proceeds efficiently with low catalyst loading and the resulting 2,3-disubstituted benzofurans form in moderate to good yields. Based on the results of a cross-over experiment, spectroscopic data, and DFT calculations, we propose a mechanism that accounts for the observed chemo- and regioselectivity.
Collapse
Affiliation(s)
- Quang Le
- California State University Fresno, 2555 E San Ramon Ave M/S SB70, Fresno, CA 93740, USA.
| | - Christopher C Dillon
- California State University Fresno, 2555 E San Ramon Ave M/S SB70, Fresno, CA 93740, USA.
| | - Dana A Lichtenstein
- California State University Fresno, 2555 E San Ramon Ave M/S SB70, Fresno, CA 93740, USA.
| | - Jeremy W Pisor
- California State University Fresno, 2555 E San Ramon Ave M/S SB70, Fresno, CA 93740, USA.
| | - Kristina D Closser
- California State University Fresno, 2555 E San Ramon Ave M/S SB70, Fresno, CA 93740, USA.
| | - Hubert Muchalski
- California State University Fresno, 2555 E San Ramon Ave M/S SB70, Fresno, CA 93740, USA.
| |
Collapse
|
7
|
Design, synthesis, and biological evaluation of novel benzodiazepine derivatives as anticancer agents through inhibition of tubulin polymerization in vitro and in vivo. Eur J Med Chem 2019; 182:111670. [DOI: 10.1016/j.ejmech.2019.111670] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 08/20/2019] [Accepted: 08/30/2019] [Indexed: 11/21/2022]
|