1
|
Shaw R, Althagafi I, Elagamy A, Rai R, Shah C, Nemaysh V, Singh H, Pratap R. Transition metal-free synthesis of sterically hindered allylarenes from 5-hexene-2-one. Org Biomol Chem 2020; 18:6276-6286. [PMID: 32734988 DOI: 10.1039/d0ob01318h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A simple, efficient and transition metal-free strategy was established for the synthesis of highly functionalized, sterically hindered allylarenes (6, 7 & 8) by base-mediated ring transformation of 2-oxo-6-aryl-4-(methylthio/sec-amino)-2H-pyran-3-carbonitriles (3/4) with 5-hexene-2-one (5). This provides a method for the synthesis of allylarenes functionalized with different electron donating and withdrawing groups in one pot. The structures of isolated products 6c and 7a were ascertained by spectroscopic and single crystal X-ray diffraction analyses. In addition, we have performed a molecular docking study to predict the biological activity of the synthesized molecules for binding to estrogen receptor alpha (ERα) and estrogen receptor beta (ERβ).
Collapse
Affiliation(s)
- Ranjay Shaw
- Department of Chemistry, University of Delhi, North Campus, Delhi-110007, India.
| | - Ismail Althagafi
- Department of Chemistry, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Amr Elagamy
- Department of Chemistry, University of Delhi, North Campus, Delhi-110007, India.
| | - Reeta Rai
- Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, New Delhi-110029, India
| | - Chandan Shah
- Department of Chemistry, University of Delhi, North Campus, Delhi-110007, India.
| | - Vishal Nemaysh
- Department of Chemistry, University of Delhi, North Campus, Delhi-110007, India.
| | - Harpreet Singh
- Indian Council of Medical Research, Ansari Nagar, New Delhi-110029, India
| | - Ramendra Pratap
- Department of Chemistry, University of Delhi, North Campus, Delhi-110007, India.
| |
Collapse
|
2
|
Wang T, Guo X, Chen T, Li J. The Pd(0) and Pd(ii) cocatalyzed isomerization of alkynyl epoxides to furans: a mechanistic investigation using DFT calculations. Dalton Trans 2020; 49:9223-9230. [PMID: 32436502 DOI: 10.1039/d0dt00965b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The conversion of alkynyl epoxides to furans is an unusual tandem catalytic process in which two different oxidation states of palladium are employed. In this study, we used density functional theory calculations to establish the mechanistic details of the catalytic cycles for all the individual processes in this conversion. The results showed that the use of Pd(0) or Pd(ii) alone as the catalyst leads to high reaction barriers. This finding is consistent with experimental observations of low furan yields and the need for high temperatures in the presence of either catalyst alone. However, a combination of Pd(0) and Pd(ii) lowers the reaction barriers considerably. Our key finding is that the reaction pathway involves epoxide ring opening catalyzed by Pd(0), followed by tautomerization of an enol to generate an allenyl ketone in conjunction with Pd(0), with a subsequent Pd(ii)-catalyzed cyclization to yield the furan.
Collapse
Affiliation(s)
- Ting Wang
- Department of Chemistry, Jinan University, Huangpu Road West 601, Guangzhou, Guangdong 510632, P. R. China.
| | - Xianming Guo
- Department of Chemistry, Jinan University, Huangpu Road West 601, Guangzhou, Guangdong 510632, P. R. China.
| | - Tao Chen
- SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, China.
| | - Juan Li
- Department of Chemistry, Jinan University, Huangpu Road West 601, Guangzhou, Guangdong 510632, P. R. China.
| |
Collapse
|
3
|
Casnati A, Fontana M, Motti E, Della Ca' N. Synthesis of fluorenyl alcohols via cooperative palladium/norbornene catalysis. Org Biomol Chem 2019; 17:6165-6173. [PMID: 31192343 DOI: 10.1039/c9ob01085h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we report a novel catalytic synthesis of substituted 9H-fluoren-9-ols starting from aryl iodides and secondary ortho-bromobenzyl alcohols in the presence of palladium/norbornene as a catalytic system. The present protocol exhibits high functional group tolerance, mild reaction conditions and moderate to good yields. This transformation is based on two sequential pathways: (i) Pd(ii)-mediated oxidation of the secondary alcohol to the corresponding ketone and (ii) Pd(0)/norbornene-catalyzed reaction of the in situ generated ortho-bromoacetophenone with the aryl iodide.
Collapse
Affiliation(s)
- Alessandra Casnati
- Department of Chemistry, Life Sciences and Environmental Sustainability and CIRCC, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy.
| | | | | | | |
Collapse
|
4
|
Kapat A, Sperger T, Guven S, Schoenebeck F. E-Olefins through intramolecular radical relocation. Science 2019; 363:391-396. [PMID: 30679370 DOI: 10.1126/science.aav1610] [Citation(s) in RCA: 97] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 12/17/2018] [Indexed: 01/20/2023]
Abstract
Full control over the selectivity of carbon-carbon double-bond migrations would enable access to stereochemically defined olefins that are central to the pharmaceutical, food, fragrance, materials, and petrochemical arenas. The vast majority of double-bond migrations investigated over the past 60 years capitalize on precious-metal hydrides that are frequently associated with reversible equilibria, hydrogen scrambling, incomplete E/Z stereoselection, and/or high cost. Here, we report a fundamentally different, radical-based approach. We showcase a nonprecious, reductant-free, and atom-economical nickel (Ni)(I)-catalyzed intramolecular 1,3-hydrogen atom relocation to yield E-olefins within 3 hours at room temperature. Remote installations of E-olefins over extended distances are also demonstrated.
Collapse
Affiliation(s)
- Ajoy Kapat
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Theresa Sperger
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Sinem Guven
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Franziska Schoenebeck
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
| |
Collapse
|
5
|
Arroniz C, Chaubet G, Anderson EA. Dual Oxidation State Tandem Catalysis in the Palladium-Catalyzed Isomerization of Alkynyl Epoxides to Furans. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02248] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Carlos Arroniz
- Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, United Kingdom
| | - Guilhem Chaubet
- Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, United Kingdom
| | - Edward A. Anderson
- Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, United Kingdom
| |
Collapse
|
6
|
Hassam M, Taher A, Arnott GE, Green IR, van Otterlo WAL. Isomerization of Allylbenzenes. Chem Rev 2015; 115:5462-569. [DOI: 10.1021/acs.chemrev.5b00052] [Citation(s) in RCA: 175] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Mohammad Hassam
- Department
of Chemistry and Polymer Science, Stellenbosch University, Private Bag
X1, Matieland 7602, South Africa
| | - Abu Taher
- Department
of Chemistry and Polymer Science, Stellenbosch University, Private Bag
X1, Matieland 7602, South Africa
| | - Gareth E. Arnott
- Department
of Chemistry and Polymer Science, Stellenbosch University, Private Bag
X1, Matieland 7602, South Africa
| | - Ivan R. Green
- Department
of Chemistry and Polymer Science, Stellenbosch University, Private Bag
X1, Matieland 7602, South Africa
| | - Willem A. L. van Otterlo
- Department
of Chemistry and Polymer Science, Stellenbosch University, Private Bag
X1, Matieland 7602, South Africa
- School
of Chemistry, University of the Witwatersrand, Braamfontein, Johannesburg 2000, South Africa
| |
Collapse
|
7
|
Simonetti SO, Larghi EL, Kaufman TS. Alternate and Step-Economic Synthesis of the β-Methylstyrene Chelating Pre-ligand of the Hoveyda-Grubbs’ II Catalyst. ORG PREP PROCED INT 2015. [DOI: 10.1080/00304948.2015.1025021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|