1
|
Dong J, Xu J. Synthesis of 2,3-dihydro-1,4-benzoxathiine derivatives. Chem Heterocycl Compd (N Y) 2022. [DOI: 10.1007/s10593-022-03084-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
2
|
Brambilla E, Abbiati G, Caselli A, Pirovano V, Rossi E. Coinage metal carbenes in heterocyclic synthesis via formation of new carbon-heteroatom bonds. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
3
|
Singh GS. Synthesis and chemistry of diazo compounds under microwave irradiation: A review. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202100803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Girija S. Singh
- University of Botswana Faculty of Science Chemistry Notwane road 0022 Gaborone BOTSWANA
| |
Collapse
|
4
|
Lei Y, Xu J. Efficient synthesis of ethyl 2-(oxazolin-2-yl)alkanoates via ethoxycarbonylketene-induced electrophilic ring expansion of aziridines. Beilstein J Org Chem 2022; 18:70-76. [PMID: 35047083 PMCID: PMC8744460 DOI: 10.3762/bjoc.18.6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 12/21/2021] [Indexed: 11/23/2022] Open
Abstract
Alkyl 2-diazo-3-oxoalkanoates generate alkoxycarbonylketenes, which undergo an electrophilic ring expansion with aziridines to afford alkyl 2-(oxazolin-2-yl)alkanoates in good to excellent yields under microwave heating. The method is a convenient and clean reaction without any activators and catalysts and can be also applied in the synthesis of 2-(oxazolin-2-yl)alkanamides and 1-(oxazolin-2-yl)alkylphosphonates.
Collapse
Affiliation(s)
- Yelong Lei
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| |
Collapse
|
5
|
Chen X, Lei Y, Fu D, Xu J. Microwave-accelerated and efficient synthesis of structurally diverse N-(2,2-diphenylvinyl)-β-oxoamides. Org Biomol Chem 2021; 19:7678-7689. [PMID: 34524331 DOI: 10.1039/d1ob01359a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N-(2,2-Diphenylvinyl)-β-oxoamides are both the structural moiety of biologically active compounds and important synthetic intermediates. Structurally diverse N-(2,2-diphenylvinyl)-β-oxoamides are prepared efficiently from 2-diazo-1,3-dicarbonyl compounds and N-alkyl-2,2-diphenylaziridines via an electrophilic ring opening reaction under two different reaction conditions of reflux and microwave irradiation. 2-Diazo-1,3-dicarbonyl compounds undergo the Wolff rearrangement under heating to generate α-oxoketenes, which electrophilically react with N-alkylaziridines to directly produce structurally diverse N-(2,2-diphenylvinyl)-β-oxoamides in good to excellent yields under microwave irradiation. Microwave irradiation accelerates the reaction obviously and efficiently. Both 2-diazo-1,3-diketones and alkyl 2-diazo-3-oxoalkanoates work well. The reaction is catalyst-free and highly atom economical, involves only loss of nitrogen and does not require additives. The products are useful synthons for the convenient preparation of multisubstituted β-lactam derivatives.
Collapse
Affiliation(s)
- Xingpeng Chen
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China. .,China Tianchen Engineering Corporation, Tianjin 300400, China
| | - Yelong Lei
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
| | - Duo Fu
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
| |
Collapse
|
6
|
Strong acid-catalyzed electrophilic ring expansion of oxetanes and sulfoxonium ylides. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111687] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
7
|
Chen X, Huang Z, Xu J. Catalyst‐Free Electrophilic Ring Expansion of
N
‐Unprotected Aziridines with
α
‐Oxoketenes to Efficient Access 2‐Alkylidene‐1,3‐Oxazolidines. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100320] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Xingpeng Chen
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry Beijing University of Chemical Technology Beijing 100029 People's Republic of China
| | - Zhengshuo Huang
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry Beijing University of Chemical Technology Beijing 100029 People's Republic of China
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry Beijing University of Chemical Technology Beijing 100029 People's Republic of China
| |
Collapse
|
8
|
Abstract
Cross-coupling reactions furnishing carbon–carbon (C–C) and carbon–heteroatom (C–X) bond is one of the most challenging tasks in organic syntheses. The early developed reaction protocols by Ullmann, Ullman–Goldberg, Cadiot–Chodkiewicz, Castro–Stephens, and Corey–House, utilizing elemental copper or its salts as catalyst have, for decades, attracted and inspired scientists. However, these reactions were suffering from the range of functional groups tolerated as well as severely restricted by the harsh reaction conditions often required high temperatures (150–200 °C) for extended reaction time. Enormous efforts have been paid to develop and achieve more sustainable reaction conditions by applying the microwave irradiation. The use of controlled microwave heating dramatically reduces the time required and therefore resulting in increase in the yield as well as the efficiency of the reaction. This review is mainly focuses on the recent advances and applications of copper catalyzed cross-coupling generation of carbon–carbon and carbon–heteroatom bond under microwave technology.
Collapse
|
9
|
Dar'in D, Kantin G, Bakulina O, Inyutina A, Chupakhin E, Krasavin M. Spirocyclizations Involving Oxonium Ylides Derived from Cyclic α-Diazocarbonyl Compounds: An Entry into 6-Oxa-2-azaspiro[4.5]decane Scaffold. J Org Chem 2020; 85:15586-15599. [PMID: 33226243 DOI: 10.1021/acs.joc.0c02356] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
New types of cyclic diazo compounds capable of Rh(II)-catalyzed spirocyclizations with tetrahydrofuran have been discovered. The formation of the spirocyclic framework is thought to proceed via the formation of Rh(II) carbene species followed by interaction with the Lewis basic oxygen atom of tetrahydrofuran to give oxonium ylide species. The latter evolves predominantly via the Stevens type rearrangement leading to an [n + 1] ring expansion of the tetrahydrofuran moiety, which results in the formation of a medicinally relevant 6-oxa-2-azaspiro[4.5]decane scaffold. The spirocyclization process was often observed in competition with mechanistically distinct C-H insertion into a tetrahydrofuran molecule. This competing process gave compounds based on the 3-(tetrahydrofur-2-yl)pyrrolidine scaffold, which are also relevant from the medicinal chemistry standpoint. These findings enrich the available arsenal of metal-catalyzed spirocyclization methods based on the use of cyclic diazo compounds.
Collapse
Affiliation(s)
- Dmitry Dar'in
- Saint Petersburg State University, Saint Petersburg, 199034 Russian Federation
| | - Grigory Kantin
- Saint Petersburg State University, Saint Petersburg, 199034 Russian Federation
| | - Olga Bakulina
- Saint Petersburg State University, Saint Petersburg, 199034 Russian Federation
| | - Anna Inyutina
- Saint Petersburg State University, Saint Petersburg, 199034 Russian Federation
| | - Evgeny Chupakhin
- Saint Petersburg State University, Saint Petersburg, 199034 Russian Federation.,Immanuel Kant Baltic Federal University, Kaliningrad 236041 Russian Federation
| | - Mikhail Krasavin
- Saint Petersburg State University, Saint Petersburg, 199034 Russian Federation.,Immanuel Kant Baltic Federal University, Kaliningrad 236041 Russian Federation
| |
Collapse
|
10
|
Abstract
Thietanes are important aliphatic four-membered thiaheterocycles that are found in the pharmaceutical core and structural motifs of some biological compounds. They are also useful intermediates in organic synthesis. Various synthetic methods of thietanes have been developed, including inter- and intramolecular nucleophilic thioetherifications, photochemical [2 + 2] cycloadditions, ring expansions and contractions, nucleophilic cyclizations, and some miscellaneous methods. The recently developed methods provide some new strategies for the efficient preparation of thietanes and their derivatives. This review focuses on the synthetic methods to construct thietane backbones developed during 1966 to 2019.
Collapse
Affiliation(s)
- Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| |
Collapse
|
11
|
Sun S, Teng C, Xu J. Microwave Thermal Effect on Diels-Alder Reaction of Furan and Maleimide. CURRENT MICROWAVE CHEMISTRY 2020. [DOI: 10.2174/2213335607666200101093318] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
Higher temperature regions (hot spots) have been observed in organic
reactions and are attributed to microwave selective heating. The accumulated heat in reaction systems
accelerates certain reactions.
Methods:
The theoretical calculation was applied to select a suitable Diels-Alder reaction as a
molecular probe to determine the microwave thermal effect on Diels-Alder reaction, one class of
bimolecular reactions. The kinetic investigations were utilized to determine the reaction activation
energies and further to calculate the actual reaction temperatures under different microwave conditions
from the Arrhenius equation.
Results:
On the basis of the theoretical calculational results, Diels-Alder reaction of furan and
maleimide was selected as a molecular probe to determine the microwave thermal effect in Diels-
Alder reaction. Their activation energies under thermal conditions were determined from kinetic
data by using the Arrhenius equation. The actual reaction temperatures under different microwave
conditions were further deduced from their activation energies and the Arrhenius equation.
Conclusion:
Higher temperature regions (hot spots) were observed in Diels-Alder reaction, and
they are more obvious in less polar solvents than those in more polar solvents in the microwave
irradiated reactions.
Collapse
Affiliation(s)
- Simin Sun
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
| | - Chong Teng
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
| |
Collapse
|
12
|
Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2018. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.213051] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
13
|
Li S, Li P, Xu J. Retro‐
Corey‐Chaykovsky
Epoxidation: Converting Geminal Disubstituted Epoxides to Ketones. Helv Chim Acta 2019. [DOI: 10.1002/hlca.201900164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Siqi Li
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of ChemistryBeijing University of Chemical Technology Beijing 100029 P. R. China
| | - Pingfan Li
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of ChemistryBeijing University of Chemical Technology Beijing 100029 P. R. China
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of ChemistryBeijing University of Chemical Technology Beijing 100029 P. R. China
| |
Collapse
|
14
|
Dong J, Du H, Xu J. Synthesis of Functionalized Thietanes via Electrophilic Carbenoid-Induced Ring Expansion of Thiiranes with Sulfonium Acylmethylides as Carbene Precursors. J Org Chem 2019; 84:10724-10739. [DOI: 10.1021/acs.joc.9b01152] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jun Dong
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Hongguang Du
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| |
Collapse
|
15
|
Guranova NI, Dar'in D, Kantin G, Novikov AS, Bakulina O, Krasavin M. Fused vs. spiro: Kinetic, not thermodynamic preference may direct the reaction of α-carbonyl oxonium ylides. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.05.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
16
|
Li C, Hu BC, Hu D, Xu XF, Zong XC, Li JP, Wu MC. Stereoselective ring-opening of styrene oxide at elevated concentration by Phaseolus vulgaris epoxide hydrolase, PvEH2, in the organic/aqueous biphasic system. CATAL COMMUN 2019. [DOI: 10.1016/j.catcom.2019.01.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
|
17
|
Guranova NI, Dar’in D, Kantin G, Novikov AS, Bakulina O, Krasavin M. Rh(II)-Catalyzed Spirocyclization of α-Diazo Homophthalimides with Cyclic Ethers. J Org Chem 2019; 84:4534-4542. [DOI: 10.1021/acs.joc.9b00245] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Natalia I. Guranova
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Dmitry Dar’in
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Grigory Kantin
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | | | - Olga Bakulina
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Mikhail Krasavin
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| |
Collapse
|
18
|
Li S, Shi Y, Li P, Xu J. Nucleophilic Organic Base DABCO-Mediated Chemospecific Meinwald Rearrangement of Terminal Epoxides into Methyl Ketones. J Org Chem 2019; 84:4443-4450. [DOI: 10.1021/acs.joc.8b03171] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Siqi Li
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, Faculty of Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Yi Shi
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, Faculty of Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Pingfan Li
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, Faculty of Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, Faculty of Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| |
Collapse
|