1
|
Abstract
We disclose herein electro-oxidative synthesis as the general protocol for procuring phenazines under mild reaction conditions. Using aerial oxygen as an oxidant, inexpensive electrolyte, and electrodes, a diverse range of phenazines have been accessed in good yields via the ring contraction of 10,11-dihydro-5H-dibenzo[b,e][1,4]diazepines. In addition, the syntheses of phenazines and diamino phenazines via direct electro-oxidation of dihydrophenazines and electro-dimerization of o-phenylenediamines, respectively, have also been accomplished.
Collapse
Affiliation(s)
- Deepak Sharma
- Department of Chemistry, Indian Institute of Technology Jammu, NH-44, Nagrota Bypass, Jammu 181221, J & K, India
| | - Namrata Kotwal
- Department of Chemistry, Indian Institute of Technology Jammu, NH-44, Nagrota Bypass, Jammu 181221, J & K, India
| | - Pankaj Chauhan
- Department of Chemistry, Indian Institute of Technology Jammu, NH-44, Nagrota Bypass, Jammu 181221, J & K, India
| |
Collapse
|
2
|
Kumar Y, Ila H. Domino Synthesis of Thiazolo-Fused Six- and Seven-Membered Nitrogen Heterocycles via Intramolecular Heteroannulation of In-Situ-Generated 2-(Het)aryl-4-amino-5-functionalized Thiazoles. J Org Chem 2022; 87:12397-12413. [PMID: 36069522 DOI: 10.1021/acs.joc.2c01673] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Synthesis of novel 2-(het)aryl-substituted thiazolo-fused six- and seven-membered heterocycles, such as thiazolo[4,5-b]pyridin-5(4H)-ones, thiazolo[4,5-c]isoquinolin-5(4H)-ones, thiazolo[4,5-b]quinolin-9(4H)-ones, 4H-benzo[e]thiazolo[4,5-b]azepine-5,10-diones, have been developed in a single-pot operation via intramolecular heteroannulation of in-situ-generated 2-(het)aryl-4-amino-5-functionalized thiazoles. These 4-amino-5-functionalized thiazoles were readily obtained in a one-pot process by treatment of a range of (het)aryldithioesters with cyanamide in the presence of NaH, followed by in situ S-alkylation-intramolecular condensations of the resulting thioimidate salts with appropriate activated methylene halides. On the other hand, the corresponding 4H-benzo[b]thiazolo[4,5-e][1,4]diazepin-10(9H)-ones were synthesized in a two-step process, requiring prior isolation of 5-carboethoxy-4-(2-nitrophenyl)aminothiazoles and their subsequent reductive cyclization. The activated methylene halides employed in these reactions for the synthesis of various thiazolo-fused heterocycles were methyl bromocrotonate, ethyl 2-(bromomethyl)benzoate, 2-fluorophenacyl bromides, ethyl 2-(2-bromoacetyl)benzoate, and ethyl bromoacetate. Several of these thiazolo-fused heterocycles display yellow green to green fluorescence, and their absorption and emission spectra have also been examined.
Collapse
Affiliation(s)
- Yogendra Kumar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
| | - Hiriyakkanavar Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
| |
Collapse
|
3
|
Laha JK, Manral N, Hunjan MK. Palladium-catalysed regioselective N-arylation of anthranilamides: a tandem route for dibenzodiazepinone synthesis. NEW J CHEM 2019. [DOI: 10.1039/c9nj00539k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A palladium-catalyzed tandem reaction of 2-aminobenzamide and 1,2-dihaloarenes for the synthesis of dibenzodiazepinone via double N-arylations (inter and intra-molecular) has been achieved.
Collapse
Affiliation(s)
- Joydev K. Laha
- Department of Pharmaceutical Technology (Process Chemistry)
- National Institute of Pharmaceutical Education and Research
- S. A. S. Nagar
- India
| | - Neelam Manral
- Department of Pharmaceutical Technology (Process Chemistry)
- National Institute of Pharmaceutical Education and Research
- S. A. S. Nagar
- India
| | - Mandeep Kaur Hunjan
- Department of Pharmaceutical Technology (Process Chemistry)
- National Institute of Pharmaceutical Education and Research
- S. A. S. Nagar
- India
| |
Collapse
|
4
|
Srinivasulu V, Janda KD, Abu-Yousef IA, O'Connor MJ, Al-Tel TH. A modular CuI-L-proline catalyzed one-pot route for the rapid access of constrained and privileged hetero-atom-linked medium-sized ring systems. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.02.061] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
5
|
Abstract
![]()
Pd-catalyzed
cross-coupling reactions that form C–N bonds
have become useful methods to synthesize anilines and aniline derivatives,
an important class of compounds throughout chemical research. A key
factor in the widespread adoption of these methods has been the continued
development of reliable and versatile catalysts that function under
operationally simple, user-friendly conditions. This review provides
an overview of Pd-catalyzed N-arylation reactions found in both basic
and applied chemical research from 2008 to the present. Selected examples
of C–N cross-coupling reactions between nine classes of nitrogen-based
coupling partners and (pseudo)aryl halides are described for the synthesis
of heterocycles, medicinally relevant compounds, natural products,
organic materials, and catalysts.
Collapse
Affiliation(s)
- Paula Ruiz-Castillo
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Stephen L Buchwald
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| |
Collapse
|
6
|
Laha JK, Satyanarayana Tummalapalli KS, Jethava KP. Implications of dynamic imine chemistry for the sustainable synthesis of nitrogen heterocycles via transimination followed by intramolecular cyclisation. Org Biomol Chem 2016; 14:2473-9. [DOI: 10.1039/c5ob02670a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
An application of dynamic imine chemistry to the sustainable synthesis of N-heterocycles from N-aryl benzylamines or imines and ortho-substituted anilines is described.
Collapse
Affiliation(s)
- Joydev K. Laha
- Department of Pharmaceutical Technology (Process Chemistry)
- National Institute of Pharmaceutical Education and Research
- S. A. S. Nagar
- India
| | - K. S. Satyanarayana Tummalapalli
- Department of Pharmaceutical Technology (Process Chemistry)
- National Institute of Pharmaceutical Education and Research
- S. A. S. Nagar
- India
| | - Krupal P. Jethava
- Department of Pharmaceutical Technology (Process Chemistry)
- National Institute of Pharmaceutical Education and Research
- S. A. S. Nagar
- India
| |
Collapse
|
7
|
Seth K, Raha Roy S, Chakraborti AK. Synchronous double C–N bond formation via C–H activation for a novel synthetic route to phenazine. Chem Commun (Camb) 2016; 52:922-5. [DOI: 10.1039/c5cc08640j] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Pd–Ag binary nanocluster-catalysed synchronous double C–N bond formationviaC–H activation during self-coupling of anilines to form phenazines.
Collapse
Affiliation(s)
- Kapileswar Seth
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Sector 67
- Punjab
- India
| | - Sudipta Raha Roy
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Sector 67
- Punjab
- India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Sector 67
- Punjab
- India
| |
Collapse
|
8
|
Laha JK, Tummalapalli KSS, Nair A, Patel N. Sulfate Radical Anion (SO4•–) Mediated C(sp3)–H Nitrogenation/Oxygenation in N-Aryl Benzylic Amines Expanded the Scope for the Synthesis of Benzamidine/Oxazine Heterocycles. J Org Chem 2015; 80:11351-9. [DOI: 10.1021/acs.joc.5b01872] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Joydev K. Laha
- Department of Pharmaceutical
Technology (Process Chemistry) National Institute of Pharmaceutical Education and Research S. A. S. Nagar, Punjab 160062 India
| | - K. S. Satyanarayana Tummalapalli
- Department of Pharmaceutical
Technology (Process Chemistry) National Institute of Pharmaceutical Education and Research S. A. S. Nagar, Punjab 160062 India
| | - Akshay Nair
- Department of Pharmaceutical
Technology (Process Chemistry) National Institute of Pharmaceutical Education and Research S. A. S. Nagar, Punjab 160062 India
| | - Nidhi Patel
- Department of Pharmaceutical
Technology (Process Chemistry) National Institute of Pharmaceutical Education and Research S. A. S. Nagar, Punjab 160062 India
| |
Collapse
|
9
|
Laha JK, Dayal N, Jethava KP, Prajapati DV. Access to Biaryl Sulfonamides by Palladium-Catalyzed Intramolecular Oxidative Coupling and Subsequent Nucleophilic Ring Opening of Heterobiaryl Sultams with Amines. Org Lett 2015; 17:1296-9. [DOI: 10.1021/acs.orglett.5b00290] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joydev K. Laha
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| | - Neetu Dayal
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| | - Krupal P. Jethava
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| | - Dilip V. Prajapati
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| |
Collapse
|
10
|
Ryan JH, Smith JA, Hyland C, Meyer AG, Williams CC, Bissember AC, Just J. Seven-Membered Rings. PROGRESS IN HETEROCYCLIC CHEMISTRY 2015. [DOI: 10.1016/b978-0-08-100024-3.00016-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
11
|
Laha JK, Dayal N, Jain R, Patel K. Palladium-Catalyzed Regiocontrolled Domino Synthesis of N-Sulfonyl Dihydrophenanthridines and Dihydrodibenzo[c,e]azepines: Control over the Formation of Biaryl Sultams in the Intramolecular Direct Arylation. J Org Chem 2014; 79:10899-907. [DOI: 10.1021/jo501910q] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Joydev K. Laha
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| | - Neetu Dayal
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| | - Roli Jain
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| | - Ketul Patel
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| |
Collapse
|
12
|
Laha JK, Jethava KP, Dayal N. Palladium-Catalyzed Intramolecular Oxidative Coupling Involving Double C(sp2)–H Bonds for the Synthesis of Annulated Biaryl Sultams. J Org Chem 2014; 79:8010-9. [DOI: 10.1021/jo5011334] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joydev K. Laha
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062 India
| | - Krupal P. Jethava
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062 India
| | - Neetu Dayal
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062 India
| |
Collapse
|
13
|
Laha JK, Tummalapalli KSS, Gupta A. Transition-Metal-Free Tandem Oxidative Removal of Benzylic Methylene Group by C–C and C–N Bond Cleavage Followed by Intramolecular New Aryl C–N Bond Formation under Radical Conditions. Org Lett 2014; 16:4392-5. [DOI: 10.1021/ol501766m] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Joydev K. Laha
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| | - K. S. Satyanarayana Tummalapalli
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| | - Ankur Gupta
- Department of Pharmaceutical
Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| |
Collapse
|