1
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Dada R, Sulthan M, Yaragorla S. Calcium-Catalyzed Stereoselective Tandem [4+2] and [3+2] Annulation Reaction for the Synthesis of Dihydropyrrolo[1,2- a]quinolines. Org Lett 2019; 22:279-283. [PMID: 31854991 DOI: 10.1021/acs.orglett.9b04293] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Calcium-catalyzed highly facile one-pot, A4 annulation of aldehyde, amine, alkene, and alkyne to form fused 4,5-dihydropyrrolo[1,2-a]quinolines with exclusive syn diastereoselectivity is reported. This selectivity arises from an inverse electron demand [4+2] aza-Diels-Alder cycloaddition, and the adduct further undergoes a formal [3+2] cyclization with activated alkynes. This diversity-oriented protocol is highly general and furnishes the dihydropyrrolo[1,2-a]quinoline derivatives with a broad substrate scope in good to excellent yields.
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Affiliation(s)
- Ravikrishna Dada
- School of Chemistry , University of Hyderabad , P.O. Central University, Gachibowli, Hyderabad 500046 , India
| | - Mahesh Sulthan
- School of Chemistry , University of Hyderabad , P.O. Central University, Gachibowli, Hyderabad 500046 , India
| | - Srinivasarao Yaragorla
- School of Chemistry , University of Hyderabad , P.O. Central University, Gachibowli, Hyderabad 500046 , India
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2
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Win KMN, Sonawane AD, Koketsu M. Iodine mediated in situ generation of R-Se–I: application towards the construction of pyrano[4,3-b]quinoline heterocycles and fluorescence properties. Org Biomol Chem 2019; 17:9039-9049. [DOI: 10.1039/c9ob01648a] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Iodine mediated in situ generation of R-Se–I and its application towards the construction of pyrano[4,3-b]quinolin-1-one derivatives.
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Affiliation(s)
- Khin Myat Noe Win
- Department of Chemistry and Biomolecular Science
- Faculty of Engineering
- Gifu University
- Gifu 501-1193
- Japan
| | - Amol D. Sonawane
- Department of Chemistry and Biomolecular Science
- Faculty of Engineering
- Gifu University
- Gifu 501-1193
- Japan
| | - Mamoru Koketsu
- Department of Chemistry and Biomolecular Science
- Faculty of Engineering
- Gifu University
- Gifu 501-1193
- Japan
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3
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Liu SW, Gao YJ, Shi Y, Zhou L, Tang X, Cui HL. Synthesis of Benzoindolizines through 1,5-Electrocyclization/Oxidation Cascades. J Org Chem 2018; 83:13754-13764. [DOI: 10.1021/acs.joc.8b02065] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Si-Wei Liu
- Laboratory of Asymmetric Synthesis, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing, 402160, China
| | - Ying-Juan Gao
- Laboratory of Asymmetric Synthesis, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing, 402160, China
| | - Yin Shi
- Laboratory of Asymmetric Synthesis, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing, 402160, China
| | - Lin Zhou
- Laboratory of Asymmetric Synthesis, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing, 402160, China
| | - Xue Tang
- Laboratory of Asymmetric Synthesis, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing, 402160, China
- State Key Laboratory Breeding Base of Systematic Research, Development and Utilization of Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China
| | - Hai-Lei Cui
- Laboratory of Asymmetric Synthesis, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing, 402160, China
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4
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Kumar S, Mujahid M, Verma AK. Regioselective 6-endo-dig iodocyclization: an accessible approach for iodo-benzo[a]phenazines. Org Biomol Chem 2018; 15:4686-4696. [PMID: 28516995 DOI: 10.1039/c7ob00671c] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A facile approach for the synthesis of substituted iodo-benzo[a]phenazines from 2-aryl-3-(aryl/alkylethynyl)quinoxalines via 6-endo-dig ring closure has been described under mild reaction conditions. Iodocyclization proceeds through the iodonium ion intermediate followed by nucleophilic cyclization with the C-H bond of the arene. Furthermore, the resulting 6-iodo-5-aryl/alkyl benzo[a]phenazine derivatives allowed for structural diversification by employing various coupling reactions. The structure of iodo-benzo[a]phenazine was confirmed by X-ray crystallographic studies of the compound.
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Affiliation(s)
- Sonu Kumar
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India.
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5
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Kumar S, Saunthwal RK, Aggarwal T, Kotla SKR, Verma AK. Palladium meets copper: one-pot tandem synthesis of pyrido fused heterocycles via Sonogashira conjoined electrophilic cyclization. Org Biomol Chem 2018; 14:9063-9071. [PMID: 27714281 DOI: 10.1039/c6ob01539e] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
An efficient step-economical tandem approach for the direct synthesis of pyrido fused indole, quinoline, benzofuran and benzothiophene derivatives using a bimetallic Pd/Cu catalytic system has been described. The three component reaction of o-halo aldehydes, alkynes and tert-butylamine leads to the synthesis of biologically active polyheterocycles. The present strategy involves the dual role of tert-butylamine and copper(i) in Sonogashira coupling followed by electrophilic cyclization through imine formation. The chemistry has been validated by X-ray crystallographic studies.
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Affiliation(s)
- Sonu Kumar
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi - 110007, India.
| | - Rakesh K Saunthwal
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi - 110007, India.
| | - Trapti Aggarwal
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi - 110007, India.
| | - Siva K Reddy Kotla
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi - 110007, India.
| | - Akhilesh K Verma
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi - 110007, India.
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6
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Wu FS, Zhao HY, Xu YL, Hu K, Pan YM, Ma XL. Catalyst-Free Synthesis of Pyrrolo[1,2-a]quinolines via Dehydration/[3 + 2] Cycloaddition Directly from 2-Methylquinolines, Aldehydes, and Alkynoates. J Org Chem 2017; 82:4289-4296. [DOI: 10.1021/acs.joc.7b00280] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fu-song Wu
- College
of Pharmacy, Guilin Medical University, Guilin 541004, People’s Republic of China
- State
Key Laboratory for Chemistry and Molecular Engineering of Medicinal
Resources, School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, People’s Republic of China
| | - Hai-yuan Zhao
- State
Key Laboratory for Chemistry and Molecular Engineering of Medicinal
Resources, School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, People’s Republic of China
| | - Yan-li Xu
- College
of Pharmacy, Guilin Medical University, Guilin 541004, People’s Republic of China
| | - Kun Hu
- State
Key Laboratory for Chemistry and Molecular Engineering of Medicinal
Resources, School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, People’s Republic of China
| | - Ying-ming Pan
- State
Key Laboratory for Chemistry and Molecular Engineering of Medicinal
Resources, School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, People’s Republic of China
| | - Xian-li Ma
- College
of Pharmacy, Guilin Medical University, Guilin 541004, People’s Republic of China
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7
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Regioselective preferential C H activation of sterically hindered 1,3-dienes over [4+2] cycloaddition. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.03.028] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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8
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Li H, Li X, Yu Y, Li J, Liu Y, Li H, Wang W. Synthesis of Indolizines via Reaction of 2-Substitued Azaarenes with Enals by an Amine-NHC Relay Catalysis. Org Lett 2017; 19:2010-2013. [DOI: 10.1021/acs.orglett.7b00566] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Hongxian Li
- State
Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory
of New Drug Design, and School of Pharmacy, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Xiangmin Li
- State
Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory
of New Drug Design, and School of Pharmacy, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Yang Yu
- State
Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory
of New Drug Design, and School of Pharmacy, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Jianjun Li
- State
Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory
of New Drug Design, and School of Pharmacy, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Yuan Liu
- State
Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory
of New Drug Design, and School of Pharmacy, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Hao Li
- State
Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory
of New Drug Design, and School of Pharmacy, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Wei Wang
- State
Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory
of New Drug Design, and School of Pharmacy, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
- Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131-0001, United States
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9
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Kumar S, Saunthwal RK, Mujahid M, Aggarwal T, Verma AK. Palladium-Catalyzed Intramolecular Fujiwara-Hydroarylation: Synthesis of Benzo[a]phenazines Derivatives. J Org Chem 2016; 81:9912-9923. [DOI: 10.1021/acs.joc.6b02096] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sonu Kumar
- Synthetic Organic Chemistry
Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Rakesh K. Saunthwal
- Synthetic Organic Chemistry
Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Mohammad Mujahid
- Synthetic Organic Chemistry
Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Trapti Aggarwal
- Synthetic Organic Chemistry
Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Akhilesh K. Verma
- Synthetic Organic Chemistry
Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
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10
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Pal S, Choudhary D, Jainth M, Kumar S, Tiwari RK, Verma AK. Regio- and Stereoselective Domino Synthesis of Oxazolo Fused Pyridoindoles and Benzofurooxazolo Pyridines from ortho-Alkynylarylaldehydes. J Org Chem 2016; 81:9356-9371. [DOI: 10.1021/acs.joc.6b02062] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Shilpi Pal
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Deepak Choudhary
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Mohit Jainth
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Sonu Kumar
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Rakesh K. Tiwari
- Chapman University School of Pharmacy, Harry and Diane Rinker Health Science Campus, 9401
Jeronimo Road, Irvine, California 92618, United States
| | - Akhilesh K. Verma
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
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11
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Boyarskiy VP, Ryabukhin DS, Bokach NA, Vasilyev AV. Alkenylation of Arenes and Heteroarenes with Alkynes. Chem Rev 2016; 116:5894-986. [DOI: 10.1021/acs.chemrev.5b00514] [Citation(s) in RCA: 319] [Impact Index Per Article: 39.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vadim P. Boyarskiy
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya nab., 7/9, Saint Petersburg 199034, Russia
| | - Dmitry S. Ryabukhin
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya nab., 7/9, Saint Petersburg 199034, Russia
- Department of Chemistry, Saint Petersburg State Forest Technical University, Institutsky per. 5, Saint Petersburg 194021, Russia
| | - Nadezhda A. Bokach
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya nab., 7/9, Saint Petersburg 199034, Russia
| | - Aleksander V. Vasilyev
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya nab., 7/9, Saint Petersburg 199034, Russia
- Department of Chemistry, Saint Petersburg State Forest Technical University, Institutsky per. 5, Saint Petersburg 194021, Russia
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12
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Rajkumar S, Antony Savarimuthu S, Senthil Kumaran R, Nagaraja CM, Gandhi T. Expedient synthesis of new cinnoline diones by Ru-catalyzed regioselective unexpected deoxygenation-oxidative annulation of propargyl alcohols with phthalazinones and pyridazinones. Chem Commun (Camb) 2016; 52:2509-12. [DOI: 10.1039/c5cc09347c] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ruthenium-catalyzed simple, cascade and one-pot synthesis of cinnoline-fused diones has been carried out by the C–H activation of phthalazinones/pyridazinones.
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Affiliation(s)
- Subramani Rajkumar
- Materials Chemistry Division
- School of Advanced Sciences
- VIT University
- India
| | | | | | - C. M. Nagaraja
- Department of Chemistry
- Indian Institute of Technology Ropar
- Punjab 140001
- India
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13
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Aggarwal T, Kumar S, Verma AK. Iodine-mediated synthesis of heterocycles via electrophilic cyclization of alkynes. Org Biomol Chem 2016; 14:7639-53. [DOI: 10.1039/c6ob01054g] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Syntheses of heterocyclesvia5-exoor 6-endo-digiodocyclizations from alkynes.
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Affiliation(s)
- Trapti Aggarwal
- Synthetic Organic Chemistry Research Laboratory
- Department of Chemistry
- University of Delhi
- Delhi
- India
| | - Sonu Kumar
- Synthetic Organic Chemistry Research Laboratory
- Department of Chemistry
- University of Delhi
- Delhi
- India
| | - Akhilesh K. Verma
- Synthetic Organic Chemistry Research Laboratory
- Department of Chemistry
- University of Delhi
- Delhi
- India
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14
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Bakshi D, Singh A. Transition-Metal-Free Synthesis of Nitrogen Containing Heterocycles With Fully SubstitutedN-fused Pyrrole Rings. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500324] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Debanjan Bakshi
- Department of Chemistry; Indian Institute of Technology Kanpur, Kanpur-; 208016 Uttar Pradesh India
| | - Anand Singh
- Department of Chemistry; Indian Institute of Technology Kanpur, Kanpur-; 208016 Uttar Pradesh India
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15
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Saunthwal RK, Patel M, Kumar S, Danodia AK, Verma AK. Pd(II)-Catalyzed CH Activation of Styrylindoles: Short, Efficient, and Regioselective Synthesis of Functionalized Carbazoles. Chemistry 2015; 21:18601-5. [DOI: 10.1002/chem.201503657] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Indexed: 12/31/2022]
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16
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Kumar S, Cruz-Hernández C, Pal S, Saunthwal RK, Patel M, Tiwari RK, Juaristi E, Verma AK. Tandem Approach to Benzothieno- and Benzofuropyridines from o-Alkynyl Aldehydes via Silver-Catalyzed 6-endo-dig Ring Closure. J Org Chem 2015; 80:10548-60. [DOI: 10.1021/acs.joc.5b01647] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Sonu Kumar
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Carlos Cruz-Hernández
- Departamento
de Química, Centro de Investigación y de Estudios Avanzados, Apdo. Postal 14-740, México City 07000, Mexico
| | - Shilpi Pal
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Rakesh K. Saunthwal
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Monika Patel
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Rakesh K. Tiwari
- Chapman
University School of Pharmacy, Harry and Diane Rinker Health Science Campus, 9401 Jeronimo Road, Irvine, California 92618, United States
| | - Eusebio Juaristi
- Departamento
de Química, Centro de Investigación y de Estudios Avanzados, Apdo. Postal 14-740, México City 07000, Mexico
| | - Akhilesh K. Verma
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
- School
of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
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17
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Rhodium(III)-catalyzed double C–H activation: a straightforward approach to fused imidazo[1,2-a]pyridines from internal alkynes. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.06.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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18
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Verma AK, Danodia AK, Saunthwal RK, Patel M, Choudhary D. Palladium-Catalyzed Triple Successive C–H Functionalization: Direct Synthesis of Functionalized Carbazoles from Indoles. Org Lett 2015; 17:3658-61. [DOI: 10.1021/acs.orglett.5b01476] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akhilesh K. Verma
- Department
of Chemistry, University of Delhi, Delhi 110007, India
- School
of Physical Sciences (SPS), Jawaharlal Nehru University, Delhi 110067, India
| | | | | | - Monika Patel
- Department
of Chemistry, University of Delhi, Delhi 110007, India
| | - Deepak Choudhary
- Department
of Chemistry, University of Delhi, Delhi 110007, India
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19
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Saunthwal RK, Patel M, Danodia AK, Verma AK. Pd-catalyzed Heck-conjoined amidation and concomitant chemoselective Michael-addition: an efficient tandem approach to highly functionalized tetrahydroquinazolines from o-haloanilines. Org Biomol Chem 2015; 13:1521-30. [DOI: 10.1039/c4ob02286f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient palladium-catalyzed tandem approach for the synthesis of highly functionalized tetrahydroquinazolines from o-haloanilines with acrylates and isothiocyanates/isocyanates via Heck-conjoined amidation/thioamidation and concomitant chemoselective Michael-addition is described.
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Affiliation(s)
- Rakesh K. Saunthwal
- Synthetic Organic Chemistry Laboratory
- Department of Chemistry
- University of Delhi
- Delhi
- India
| | - Monika Patel
- Synthetic Organic Chemistry Laboratory
- Department of Chemistry
- University of Delhi
- Delhi
- India
| | - Abhinandan K. Danodia
- Synthetic Organic Chemistry Laboratory
- Department of Chemistry
- University of Delhi
- Delhi
- India
| | - Akhilesh K. Verma
- Synthetic Organic Chemistry Laboratory
- Department of Chemistry
- University of Delhi
- Delhi
- India
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20
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Saunthwal RK, Patel M, Tiwari RK, Parang K, Verma AK. On water: catalyst-free chemoselective synthesis of highly functionalized tetrahydroquinazolines from 2-aminophenylacrylate. GREEN CHEMISTRY 2015; 17:1434-1441. [DOI: 10.1039/c4gc02154a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/09/2024]
Abstract
A green and catalyst free atom-ecomonic straightforward tandem approach for the synthesis of highly functionalized tetrahydroquinazolines by the reaction of 2-aminophenylacrylate1with isothiocyanates2using water as an environmental friendly solvent is described.
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Affiliation(s)
- Rakesh K. Saunthwal
- Synthetic Organic Chemistry Laboratory
- Department of Chemistry
- University of Delhi
- Delhi
- India
| | - Monika Patel
- Synthetic Organic Chemistry Laboratory
- Department of Chemistry
- University of Delhi
- Delhi
- India
| | | | | | - Akhilesh K. Verma
- Synthetic Organic Chemistry Laboratory
- Department of Chemistry
- University of Delhi
- Delhi
- India
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21
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Saunthwal RK, Patel M, Kumar S, Verma AK. Cu(II)-catalyzed tandem synthesis of 2-imino[1,3]benzothiazines from 2-aminoaryl acrylates via thioamidation and concomitant chemoselective thia-Michael addition. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.12.058] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Kostochka ML, Zajicek J, Fuselier JA, Etienne MA, Sun L, Coy DH. Novel Tandem Aldol Intramolecular Cyclization of SubstitutedN-Benzylpiperidine-4-one: Synthesis of Novel-Type Nitrogen 2,8-Phenanthroline Heterocycles. J Heterocycl Chem 2014. [DOI: 10.1002/jhet.2263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Michael L. Kostochka
- Peptide Research Laboratory, School of Medicine; Tulane University; New Orleans 70112 Louisiana USA
| | - Jaroslav Zajicek
- Magnetic Resonance Research Center, Department of Chemistry and Biochemistry; University of Notre Dame; Notre Dame 46556 Indiana USA
| | - Joseph A. Fuselier
- Peptide Research Laboratory, School of Medicine; Tulane University; New Orleans 70112 Louisiana USA
| | - Marcus A. Etienne
- Peptide Research Laboratory, School of Medicine; Tulane University; New Orleans 70112 Louisiana USA
| | - Lichun Sun
- Peptide Research Laboratory, School of Medicine; Tulane University; New Orleans 70112 Louisiana USA
| | - David H. Coy
- Peptide Research Laboratory, School of Medicine; Tulane University; New Orleans 70112 Louisiana USA
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23
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Arigela RK, Kumar R, Samala S, Gupta S, Kundu B. Diversity-Oriented Synthesis of Polycyclic Indoles: Brønsted or Lewis Acid Catalyzed Three-Component Reaction for the Synthesis of α-Carbolines and Pyrimidoindoles. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402633] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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24
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Jha RR, Aggarwal T, Verma AK. Stereoselective tandem synthesis of oxazolo-fused pyrroloquinolines from o-alkynylaldehydes via Ag(I)-catalyzed regioselective 5-exo-dig ring closure. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.02.103] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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25
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Jha RR, Saunthwal RK, Verma AK. Stereoselective tandem synthesis of thiazolo fused naphthyridines and thienopyridines from o-alkynylaldehydes via Au(iii)-catalyzed regioselective 6-endo-dig ring closure. Org Biomol Chem 2014; 12:552-6. [DOI: 10.1039/c3ob42035c] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Sajitha TS, Prathapan S, Unnikrishnan PA. Novel Burgess reagent mediated C-to-N aryl migration reaction in nitrones. RSC Adv 2014. [DOI: 10.1039/c4ra06835a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nitrones undergo useful transformations with Burgess reagent, ostensibly involving a [3 + 2] annulation across a σ-bond followed by rearrangement involving C-to-N aryl migration.
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Affiliation(s)
- T. S. Sajitha
- Department of Applied Chemistry
- Cochin University of Science and Technology
- Cochin 682 022, India
| | - S. Prathapan
- Department of Applied Chemistry
- Cochin University of Science and Technology
- Cochin 682 022, India
| | - P. A. Unnikrishnan
- Department of Applied Chemistry
- Cochin University of Science and Technology
- Cochin 682 022, India
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27
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Gupta PK, Hussain MK, Asad M, Kant R, Mahar R, Shukla SK, Hajela K. A metal-free tandem approach to prepare structurally diverse N-heterocycles: synthesis of 1,2,4-oxadiazoles and pyrimidinones. NEW J CHEM 2014. [DOI: 10.1039/c4nj00361f] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N-heterocycles, namely 1,2,4-oxadiazoles and 2,6 disubstituted pyrimidin-4-ones, have been synthesised in one pot via carboxamidation of amidines with aryl carboxylic acids and aryl propargylic acids under metal-free conditions.
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Affiliation(s)
- Puneet K. Gupta
- Division of Medicinal and Process Chemistry
- CSIR-Central Drug Research Institute
- Lucknow 226031, India
| | - Mohd. Kamil Hussain
- Division of Medicinal and Process Chemistry
- CSIR-Central Drug Research Institute
- Lucknow 226031, India
| | - Mohd. Asad
- Division of Medicinal and Process Chemistry
- CSIR-Central Drug Research Institute
- Lucknow 226031, India
| | - Ruchir Kant
- Molecular and Structural Biology Division
- CSIR-Central Drug Research Institute
- Lucknow 226031, India
| | - Rohit Mahar
- Sophisticated Analytical Instrument Facility
- CSIR-Central Drug Research Institute
- Lucknow 226031, India
| | - Sanjeev K. Shukla
- Sophisticated Analytical Instrument Facility
- CSIR-Central Drug Research Institute
- Lucknow 226031, India
| | - Kanchan Hajela
- Division of Medicinal and Process Chemistry
- CSIR-Central Drug Research Institute
- Lucknow 226031, India
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28
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Jha RR, Danodia AK, Kumar S, Verma AK. Au(III)-catalyzed regio- and stereoselective tandem synthesis of oxazolo fused naphthyridines and isoquinolines from o-alkynylaldehydes. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2013.11.072] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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29
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Sarkar S, Bera K, Jalal S, Jana U. Synthesis of Structurally Diverse Polyfunctional Pyrrolo[1,2-a]quinolines by Sequential Iron-Catalyzed Three-Component Coupling and Gold-Catalyzed Hydroarylation Reactions. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300659] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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30
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Muzart J. Three to seven C–C or C–heteroatom bonds from domino reactions involving a Heck process. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.05.061] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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31
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Affiliation(s)
- Rafael Chinchilla
- Departamento de Química Orgánica,
Facultad
de Ciencias, and Instituto de Síntesis Orgánica (ISO), Universidad de Alicante, Apartado 99, 03080 Alicante,
Spain
| | - Carmen Nájera
- Departamento de Química Orgánica,
Facultad
de Ciencias, and Instituto de Síntesis Orgánica (ISO), Universidad de Alicante, Apartado 99, 03080 Alicante,
Spain
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32
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Verma AK, Choudhary D, Saunthwal RK, Rustagi V, Patel M, Tiwari RK. On water: silver-catalyzed domino approach for the synthesis of benzoxazine/oxazine-fused isoquinolines and naphthyridines from o-alkynyl aldehydes. J Org Chem 2013; 78:6657-69. [PMID: 23826940 DOI: 10.1021/jo4009639] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
An operationally simple domino approach for the silver-catalyzed synthesis of oxazine/benzoxazine-fused isoquinolines 5a-q and naphthyridines 6a-v by the reaction of o-alkynyl aldehydes 3a-aa with amines having embedded nucleophiles 4a-d under mild reaction condition in water is described. The reaction shows selective C-N bond formation on the more electrophilic alkynyl carbon resulting in the formation of 6-endo-dig cyclized product. The competitive experiments show the viability of an intramolecular nucleophilic attack over an intermolecular attack of the external nucleophile. This methodology accommodates wide functional group variation, which proves to be useful for structural and biological assessment.
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Affiliation(s)
- Akhilesh K Verma
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India.
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33
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Verma AK, Kotla SKR, Aggarwal T, Kumar S, Nimesh H, Tiwari RK. Tandem Synthesis of Pyrroloacridones via [3 + 2] Alkyne Annulation/Ring-Opening with Concomitant Intramolecular Aldol Condensation. J Org Chem 2013; 78:5372-84. [DOI: 10.1021/jo400539x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Akhilesh K. Verma
- Synthetic Organic
Chemistry
Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
| | - Siva K. Reddy Kotla
- Synthetic Organic
Chemistry
Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
| | - Trapti Aggarwal
- Synthetic Organic
Chemistry
Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
| | - Sonu Kumar
- Synthetic Organic
Chemistry
Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
| | - Hemlata Nimesh
- Chemical Biology Laboratory,
Department
of Chemistry, University of Delhi, Delhi,
110007, India
| | - Rakesh K. Tiwari
- Department of Biomedical & Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, Rhode Island 02881, United States
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34
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Verma AK, Kotla SKR, Choudhary D, Patel M, Tiwari RK. Silver-Catalyzed Tandem Synthesis of Naphthyridines and Thienopyridines via Three-Component Reaction. J Org Chem 2013; 78:4386-401. [DOI: 10.1021/jo400400c] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Akhilesh K. Verma
- Synthetic Organic
Chemistry
Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Siva K. Reddy Kotla
- Synthetic Organic
Chemistry
Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Deepak Choudhary
- Synthetic Organic
Chemistry
Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Monika Patel
- Synthetic Organic
Chemistry
Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Rakesh K. Tiwari
- Department of Biomedical & Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, Rhode Island 02881, United States
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