1
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Tang J, Lu F, Zhang X, Su Y, Zhang E, Yang Z. Copper-Catalyzed Chemodivergent Synthesis of Oxazoles and Imidazolidones by Selective C-O/C-N Cyclization. J Org Chem 2023. [PMID: 37433741 DOI: 10.1021/acs.joc.3c00505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/13/2023]
Abstract
Efficient synthesis of phenylalanine-derived oxazoles and imidazolidones can be achieved by copper-catalyzed reactions that are controlled by directing groups and proceed by selective C-O or C-N coupling. This strategy employs inexpensive commercial copper catalysts and readily available starting materials. It uses a convenient reaction procedure and provides a reliable approach to the versatile and flexible assembly of heterocyclic building blocks.
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Affiliation(s)
- Jian Tang
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, P. R. China
| | - Fengjie Lu
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, P. R. China
| | - Xinyi Zhang
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, P. R. China
| | - Yiming Su
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, P. R. China
| | - Ensheng Zhang
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, P. R. China
| | - Zhiyu Yang
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, P. R. China
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2
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Shinde SR, Girase P, Dhawan S, Inamdar SN, Kumar V, Pawar C, Palkar MB, Shinde M, Karpoormath R. A systematic appraisal on catalytic synthesis of 1,3-oxazole derivatives: A mechanistic review on metal dependent synthesis. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2021.1989596] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Suraj R. Shinde
- Department of Pharmaceutical Chemistry, Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal (Westville), Durban, South Africa
| | - Pankaj Girase
- Department of Pharmaceutical Chemistry, Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal (Westville), Durban, South Africa
| | - Sanjeev Dhawan
- Department of Pharmaceutical Chemistry, Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal (Westville), Durban, South Africa
| | - Shaukatali N. Inamdar
- Department of Pharmaceutical Chemistry, Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal (Westville), Durban, South Africa
| | - Vishal Kumar
- Department of Pharmaceutical Chemistry, Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal (Westville), Durban, South Africa
| | - Chandrakant Pawar
- Department of Pharmaceutical Chemistry, Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal (Westville), Durban, South Africa
| | - Mahesh B. Palkar
- Department of Pharmaceutical Chemistry, Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal (Westville), Durban, South Africa
- K. L. E. Society’s College of Pharmacy, J. T. College Campus, Gadag, India
| | - Mahadev Shinde
- Department of Pharmaceutical Chemistry, Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal (Westville), Durban, South Africa
| | - Rajshekhar Karpoormath
- Department of Pharmaceutical Chemistry, Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal (Westville), Durban, South Africa
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3
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Sierra S, Dalmau D, Higuera S, Cortés D, Crespo O, Jimenez AI, Pop A, Silvestru C, Urriolabeitia EP. Reactivity of ( Z)-4-Aryliden-5(4 H)-thiazolones: [2 + 2]-Photocycloaddition, Ring-Opening Reactions, and Influence of the Lewis Acid BF 3. J Org Chem 2021; 86:12119-12140. [PMID: 34479406 PMCID: PMC9129068 DOI: 10.1021/acs.joc.1c01458] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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The
irradiation of (Z)-2-phenyl-4-aryliden-5(4H)-thiazolones 2 with blue light (465 nm) in
CH2Cl2 solution promotes [2 + 2]-photocycloaddition
of the exocyclic C=C bonds and the formation of the dispirocyclobutanes 3. This reaction takes place with high stereoselectivity,
given that the ε-isomer (1,3 head-to-tail syn coupling) is formed
in more than 90% yield in most of the cases. However, irradiation
of 5(4H)-thiazolones 2 with blue light
(456 nm) in dry MeOH in the presence of BF3·OEt2 leads to the monospirocyclobutanes 4 with full
stereoselectivity, also affording the ε-isomer. A ring-opening
reaction of only one of the thiazolone rings appears to have taken
place in 4 upon methanolysis, leading to the corresponding
ester and thioamide groups. The treatment of free 4-aryliden-5(4H)-thiazolones 2 with a base in alcohol (NaOR/ROH)
also produces a ring-opening reaction of the heterocycle by methanolysis,
although, under these reaction conditions, further intramolecular
S-attack at the exocyclic C(H)=C bond and cyclization is observed,
forming the dihydrothiazoles 5 or 6 as mixtures
of cis (RS/SR)-
and trans (RR/SS)-isomers with high diastereomeric excess. trans-(RR/SS)-Dihydrothiazoles 6 can be
isolated as pure diastereoisomers by column chromatography. Surprisingly,
dihydrothiazoles 5 can also be obtained by the treatment
of 4-aryliden-5(4H)-thiazolones 2 with
BF3·OEt2 in methanol in the absence of
a base.
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Affiliation(s)
- Sonia Sierra
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - David Dalmau
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Sheila Higuera
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Darío Cortés
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Olga Crespo
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Ana I Jimenez
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Alexandra Pop
- Supramolecular Organic and Organometallic Chemistry Centre, Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Str. Arany Janos 11, 400028 Cluj-Napoca, Romania
| | - Cristian Silvestru
- Supramolecular Organic and Organometallic Chemistry Centre, Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Str. Arany Janos 11, 400028 Cluj-Napoca, Romania
| | - Esteban P Urriolabeitia
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
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4
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Singh P, Kumar Chouhan K, Mukherjee A. Ruthenium Catalyzed Intramolecular C-X (X=C, N, O, S) Bond Formation via C-H Functionalization: An Overview. Chem Asian J 2021; 16:2392-2412. [PMID: 34251077 DOI: 10.1002/asia.202100513] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 07/09/2021] [Indexed: 01/12/2023]
Abstract
Ruthenium catalyzed C-H activation is well known for its high tolerance towards the functional group and broad applicability in organic synthesis and molecular sciences, with significant applications in pharmaceutical industries, material sciences, and polymer industry. In the last few decades, enormous progress has been observed with ruthenium-catalyzed C-H activation chemistry. Notably, the vast majority of the C-H functionalization known in the literature are intermolecular, although the intramolecular variant provides fascinating new structural facet starting from the simple molecular scaffolds. Intramolecular C-H functionalization is atom economical and step efficient, results in less formation of undesired products which is easy to purify. This has created a lot of interest in organic chemistry in developing new synthetic strategies for such functionalization. The focus of this review is to present the relatively unexplored intramolecular functionalization of C-H bonds into C-X (X=C, N, O, S) bonds utilizing versatile ruthenium catalysts, their scope, and brief mechanistic discussion.
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Affiliation(s)
- Pallavi Singh
- Department of Chemistry, Indian Institute of Technology Bhilai GEC Campus, Sejbahar, Raipur, Chhattisgarh, 492015, India
| | - Kishor Kumar Chouhan
- Department of Chemistry, Indian Institute of Technology Bhilai GEC Campus, Sejbahar, Raipur, Chhattisgarh, 492015, India
| | - Arup Mukherjee
- Department of Chemistry, Indian Institute of Technology Bhilai GEC Campus, Sejbahar, Raipur, Chhattisgarh, 492015, India
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5
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Zhuge J, Jiang Z, Jiang W, Histand G, Lin D. Iodine-catalyzed oxidative functionalization of purines with (thio)ethers or methylarenes for the synthesis of purin-8-one analogues. Org Biomol Chem 2021; 19:5121-5126. [PMID: 34018534 DOI: 10.1039/d1ob00118c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient oxidative functionalization of purine-like substrates with (thio)ethers or methylarenes under mild conditions is described. Using I2 as the catalyst, and TBHP as the oxidant, this protocol provides a valuable synthetic tool for the assembly of a wide range of 9-alkyl(benzyl)purin-8-one derivatives with high atom- and step-economy and exceptional functional group tolerance.
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Affiliation(s)
- Juanping Zhuge
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Ziyang Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Wei Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Gary Histand
- International School of Advanced Materials, South China University of Technology, Guangzhou 510640, China
| | - Dongen Lin
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
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6
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Borpatra PJ, Deka B, Deb ML, Baruah PK. Recent advances in intramolecular C–O/C–N/C–S bond formationviaC–H functionalization. Org Chem Front 2019. [DOI: 10.1039/c9qo00863b] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review presents the construction of C–X bonds (X = O/N/S) by using intramolecular C–H functionalization for the synthesis of heterocyclic compounds.
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Affiliation(s)
- Paran J. Borpatra
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| | - Bhaskar Deka
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| | - Mohit L. Deb
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| | - Pranjal K. Baruah
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
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