1
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Gharpure SJ, Kumari S. Cascade radical cyclization on 3-propargyl-2-alkenyl indole gives stereoselective access to cyclohepta[ b]indole over carbazole. Chem Commun (Camb) 2024; 60:538-541. [PMID: 38050781 DOI: 10.1039/d3cc05237k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
A protecting group-dependent diastereoselective synthesis of cyclohepta[b]indole over carbazole derivatives is developed. This strategy involves a regioselective 6-exo-trig radical cyclization-cyclopropanation-ring expansion cascade of 3-propargyl-2-alkenyl indole. The cascade radical cyclization was also performed on indole derivatives possessing alkyne, acrylate and vinylogous carbamate moieties, which delivered pyridocarbazole giving credence to the mechanistic hypothesis. Furthermore, cyclohepta[b]indole could be selectively converted to sulfone and sulfoxide as well as benzoazulenoindole via intramolecular Friedel-Crafts acylation.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India.
| | - Sanyog Kumari
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India.
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2
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Gharpure S, Chavan R, Ardhapure A. Iron‐Catalyzed Reductive Cyclization of Alkenyl Vinylogous Carbonates for Stereoselective Synthesis of Substituted Tetrahydrofurans, Tetrahydropyrans and Chromans. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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3
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Gharpure SJ, Kumari S. Protecting Group-Dependent Synthesis of Densely Substituted Dihydropyrroles v/s Pyrroles via 5 -Exo-trig Cascade Radical Cyclization to Alkynyl Vinylogous Carbamates. J Org Chem 2022; 87:6781-6793. [PMID: 35544612 DOI: 10.1021/acs.joc.2c00473] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Densely substituted dihydropyrroles could be synthesized with excellent diastereoselectivity via 5-exo-trig cascade radical cyclization to alkynyl vinylogous carbamates. N-Alkyl/acyl protected alkynyl vinylogous carbamates upon radical cyclization using thiophenol gave substituted pyrroles as against dihydropyrroles, which were formed with N-sulfonyl protecting groups. This enabled a rare example wherein both dihydropyrrole and pyrrole rings are assembled in the same reaction. This strategy could be used for the synthesis of an unprecedented adjacent polyheterocyclic system having a furan-thiophene-pyrrole motif. When vinylogous carbamate is embedded in the isoindole moiety, a pyridoisoindole derivative was formed with excellent diastereoselectivity, instead of the expected pyrroloisoindole product.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Sanyog Kumari
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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4
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Gharpure SJ, Hande PE, Pandey SK, Samala G. TMSOTf-Mediated Formal [4 + 2] Cycloaddition-Retro-aza-Michael Cascade of Vinylogous Carbamates for the Synthesis of Highly Fluorescent Pyridocarbazoles. J Org Chem 2021; 86:16652-16665. [PMID: 34766500 DOI: 10.1021/acs.joc.1c01927] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Trimethylsilyl trifluoromethanesulfonate mediated dimerization reaction of vinylogous carbamates of carbazoles gave highly fluorescent pyridocarbazoles through a Povarov-type formal [4 + 2] cycloaddition-retro-aza-Michael cascade. The developed strategy was used to access indolo pyridocarbazole and quinolizinocarbazolone in an expeditious manner. Various coupling reactions were successfully performed on synthesized pyridocarbazoles to study the effect of electronics of substitution on photophysical properties. Synthesized carbazoles possess excellent photophysical properties with high quantum yields (ΦF). Fluorescent carbazole dicarboxylic acid showed potential as a pH probe to give a linear response to pH over a very wide range (7.0-3.0) reflecting high efficiency.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Pankaj E Hande
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Surya K Pandey
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Ganesh Samala
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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5
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Evaluation of renewable feedstock-derived copolymers of stearyl methacrylate-co-triglyceride as multifunctional green additives in lubricant. Polym Bull (Berl) 2021. [DOI: 10.1007/s00289-021-03611-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Chinnabattigalla S, Dakoju RK, Gedu S. Recent advances on the synthesis of flavans, isoflavans, and neoflavans. J Heterocycl Chem 2020. [DOI: 10.1002/jhet.4176] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
| | - Ravi Kishore Dakoju
- Department of Chemistry Indian Institute of Technology Hyderabad Sangareddy Telangana India
| | - Satyanarayana Gedu
- Department of Chemistry Indian Institute of Technology Hyderabad Sangareddy Telangana India
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7
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Zimnitskiy NS, Denikaev AD, Barkov AY, Kutyashev IB, Korotaev VY, Sosnovskikh VY. Catalyst-free Tandem 1,3-Dipolar Cycloaddition/Aldol Condensation: Diastereoselective Construction of the Azatetraquinane Skeleton. J Org Chem 2020; 85:8683-8694. [PMID: 32517470 DOI: 10.1021/acs.joc.0c01127] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The one-pot regioselective and diastereoselective method for the synthesis of 5-(het)aroyl-7-(het)arylhexahydrobenzo[4,5]pentaleno[1,6a-b](thia)pyrrolizine-6,12-diones from accessible 1,5-di(het)arylpent-4-ene-1,3-diones or curcuminoids in 38-98% yield was developed. This reaction proceeds as a sequence of 1,3-dipolar cycloaddition of azomethine ylide generated in situ from ninhydrin and (thia)proline at the C═C bond of corresponding enedione, followed by spontaneous intramolecular aldol condensation and leads to the formation of an azatetraquinane scaffold.
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Affiliation(s)
- Nikolay S Zimnitskiy
- Institute of Natural Sciences and Mathematics, Ural Federal University, pr. Lenina 51, 620000 Ekaterinburg, Russian Federation
| | - Andrey D Denikaev
- Institute of Natural Sciences and Mathematics, Ural Federal University, pr. Lenina 51, 620000 Ekaterinburg, Russian Federation
| | - Alexey Y Barkov
- Institute of Natural Sciences and Mathematics, Ural Federal University, pr. Lenina 51, 620000 Ekaterinburg, Russian Federation
| | - Igor B Kutyashev
- Institute of Natural Sciences and Mathematics, Ural Federal University, pr. Lenina 51, 620000 Ekaterinburg, Russian Federation
| | - Vladislav Y Korotaev
- Institute of Natural Sciences and Mathematics, Ural Federal University, pr. Lenina 51, 620000 Ekaterinburg, Russian Federation
| | - Vyacheslav Y Sosnovskikh
- Institute of Natural Sciences and Mathematics, Ural Federal University, pr. Lenina 51, 620000 Ekaterinburg, Russian Federation
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8
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Reddy ACS, Anbarasan P. Rhodium-Catalyzed Rearrangement of S/Se-Ylides for the Synthesis of Substituted Vinylogous Carbonates. Org Lett 2019; 21:9965-9969. [DOI: 10.1021/acs.orglett.9b03852] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
| | - Pazhamalai Anbarasan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
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9
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Senboku H, Sakai K, Fukui A, Sato Y, Yamauchi Y. Efficient Synthesis of Mandel Acetates by Electrochemical Carboxylation of Benzal Diacetates. ChemElectroChem 2019. [DOI: 10.1002/celc.201900200] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Hisanori Senboku
- Faculty of EngineeringHokkaido University Kita 13 Nishi 8, Kita-ku, Sapporo Hokkaido 060-8628 Japan
| | - Kanae Sakai
- Graduate School of EngineeringHokkaido University Kita 13 Nishi 8, Kita-ku, Sapporo Hokkaido 060-8628 Japan
| | - Akihiro Fukui
- Graduate School of Chemical Sciences and EngineeringHokkaido University Kita 13 Nishi 8, Kita-ku, Sapporo Hokkaido 060-8628 Japan
| | - Yusuke Sato
- Graduate School of Chemical Sciences and EngineeringHokkaido University Kita 13 Nishi 8, Kita-ku, Sapporo Hokkaido 060-8628 Japan
| | - Yusuke Yamauchi
- Graduate School of EngineeringHokkaido University Kita 13 Nishi 8, Kita-ku, Sapporo Hokkaido 060-8628 Japan
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10
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Gharpure SJ, Naveen S, Samala G, Vishwakarma DS. Transition-Metal Acetate-Promoted Intramolecular Nitrene Insertion to Vinylogous Carbonates for Divergent Synthesis of Azirinobenzoxazoles and Benzoxazines. Chemistry 2019; 25:1456-1460. [PMID: 30489663 DOI: 10.1002/chem.201805493] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 11/27/2018] [Indexed: 11/09/2022]
Abstract
Synthesis and isolation of highly unstable azirinobenzoxazole and benzoxazines in a chemodivergent fashion from aryl azido vinylogous carbonates by simple change in transition metal acetate is described. Thermal or rhodium(II) acetate-mediated decomposition of these azides gave dihydroazirino benzoxazole. Their nickel(II) acetate-promoted reaction gave 4-dihydro-2H-benzoxazines, whereas copper(II) acetate led to the corresponding oxidized imine derivatives. Benzaoxazine derivative could be kinetically resolved using a proline-catalyzed Mannich reaction. The benzoxazines were rapidly elaborated to angularly fused tetracyclic systems and coumarin-fused derivatives in a "one pot" fashion.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-, 400076, India
| | - Sudi Naveen
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-, 400076, India
| | - Ganesh Samala
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-, 400076, India
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11
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Gharpure SJ, Padmaja, Prasath V, Shelke YG. Cascade Radical Cyclization on Alkynyl Vinylogous Carbonates for the Divergent Synthesis of Tetrasubstituted Furans and Dihydrofurans. Org Lett 2019; 21:223-227. [PMID: 30582819 DOI: 10.1021/acs.orglett.8b03668] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A single alkynyl vinylogous carbonate was elaborated to tetrasubstituted furan or dihydrofuran via a cascade inter-intramolecular radical reaction by changing the radical being added. The strategy could be used in the synthesis of polycyclic heterocycles as well as bis-furan exhibiting atropisomerism. Installation of a new furan motif on the existing one was feasible by iteration. Stannyl dihydrofuran derivative was used in Stille coupling, whereas intramolecular Friedel-Crafts acylation on the furan gave furanonaphthol.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry , Indian Institute of Technology Bombay , Powai, Mumbai 400076 , India
| | - Padmaja
- Department of Chemistry , Indian Institute of Technology Bombay , Powai, Mumbai 400076 , India
| | - V Prasath
- Department of Chemistry , Indian Institute of Technology Bombay , Powai, Mumbai 400076 , India
| | - Yogesh G Shelke
- Department of Chemistry , Indian Institute of Technology Bombay , Powai, Mumbai 400076 , India
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12
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Masusai C, Soorukram D, Kuhakarn C, Reutrakul V, Pohmakotr M. Stereoselective Synthesis of gem
-Difluoromethylenated Linear Azatriquinanes. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701415] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Chonticha Masusai
- Faculty of Applied Science and Engineering; Khon Kaen University; Nong Khai Campus 43000 Nong Khai Thailand
| | - Darunee Soorukram
- Center of Excellence for Innovation in Chemistry (PERCH-CIC) and Department of Chemistry; Faculty of Science; Mahidol University; Rama VI Road 10400 Bangkok Thailand
| | - Chutima Kuhakarn
- Center of Excellence for Innovation in Chemistry (PERCH-CIC) and Department of Chemistry; Faculty of Science; Mahidol University; Rama VI Road 10400 Bangkok Thailand
| | - Vichai Reutrakul
- Center of Excellence for Innovation in Chemistry (PERCH-CIC) and Department of Chemistry; Faculty of Science; Mahidol University; Rama VI Road 10400 Bangkok Thailand
| | - Manat Pohmakotr
- Center of Excellence for Innovation in Chemistry (PERCH-CIC) and Department of Chemistry; Faculty of Science; Mahidol University; Rama VI Road 10400 Bangkok Thailand
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13
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Abe T, Morita T, Yamada K. Radical Cyclizations of Aryl Bromides for Synthesis of Cyclopenta[b]indoles from Vince Lactam. HETEROCYCLES 2018. [DOI: 10.3987/com-17-s(t)15] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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14
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Convenient one-pot access to novel densely functionalized pyrano[2,3-d][1,3,4]thiadiazolo[3,2-a]pyrimidines via three component reaction. RESEARCH ON CHEMICAL INTERMEDIATES 2017. [DOI: 10.1007/s11164-017-2904-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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15
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Katayama A, Senboku H. Sequential Vinyl Radical Cyclization/Fixation of Carbon Dioxide through Electrochemical Reduction of Vinyl Bromide in the Presence of an Electron-Transfer Mediator. ChemElectroChem 2016. [DOI: 10.1002/celc.201600508] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Asahi Katayama
- Graduate School of Chemical Sciences and Engineering; Hokkaido University; Kita 13 Nishi 8, Kita-ku, Sapporo Hokkaido 060-8628 Japan
| | - Hisanori Senboku
- Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8, Kita-ku, Sapporo Hokkaido 060-8628 Japan
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16
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Kotha S, Aswar VR. Target Specific Tactics in Olefin Metathesis: Synthetic Approach to cis-syn-cis-Triquinanes and -Propellanes. Org Lett 2016; 18:1808-11. [DOI: 10.1021/acs.orglett.6b00537] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai, 400 076, India
| | - Vikas R. Aswar
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai, 400 076, India
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17
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Gharpure SJ, Nanda SK. Stereoselective synthesis of thiazino[4,3-a]indoles using the thia-Pictet-Spengler reaction of indoles bearing N-tethered thiols and vinylogous thiocarbonates. Org Biomol Chem 2016; 14:5586-90. [PMID: 27011230 DOI: 10.1039/c6ob00501b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
An inter- as well as intra-molecular thia-Pictet-Spengler cyclization of N-tethered thiols and vinylogous thiocarbonates is described for the stereoselective synthesis of N-fused thiazinoindole derivatives. The strategy is extended to one-pot, sequential Friedel-Crafts alkylation - Pictet-Spengler cyclization and the synthesis of thiazino-oxepino-indole.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India.
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18
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Zhang M, Yu S, Hu F, Liao Y, Liao L, Xu X, Yuan W, Zhang X. Highly enantioselective [3+2] coupling of cyclic enamides with quinone monoimines promoted by a chiral phosphoric acid. Chem Commun (Camb) 2016; 52:8757-60. [DOI: 10.1039/c6cc01200k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A chiral phosphoric acid promoted [3+2] coupling of cyclic enamides with quinone monoimines provided highly enantioenriched polycyclic 2,3-dihydrobenzofurans.
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Affiliation(s)
- Minmin Zhang
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu
- China
| | - Shuowen Yu
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu
- China
| | - Fangzhi Hu
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu
- China
| | - Yijun Liao
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu
- China
| | - Lihua Liao
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu
- China
| | - Xiaoying Xu
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu
- China
| | - Weicheng Yuan
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu
- China
| | - Xiaomei Zhang
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu
- China
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19
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Reddy BVS, Medaboina D, Reddy SG, Reddy VH, Singarapu KK, Sridhar B. Domino Strategy for the Stereoselective Construction of Angularly Fused Tricyclic Ethers. J Org Chem 2015; 80:12580-7. [PMID: 26562722 DOI: 10.1021/acs.joc.5b02241] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A stereoselective synthesis of decahydrofuro[3,2-d]isochromene derivatives has been achieved by the condensation of 2-cyclohexenylbutane-1,4-diol with aldehydes in the presence of a stochiometric amount of BF3·OEt2 in dichloromethane at -78 °C. Similarly, the condensation of 2-cyclopentenylbutan-1,4-diol with aldehydes provides the corresponding octahydro-2H-cyclopenta[c]furo[2,3-d]pyran derivatives in good yields with high diastereoselectivity. It is an elegant strategy for the quick construction of tricyclic architectures with four contiguous stereogenic centers in a single step. These tricyclic frameworks are the integral part of numerous natural products.
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Affiliation(s)
- B V Subba Reddy
- Natural Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology , Hyderabad - 500 007, India
| | - Durgaprasad Medaboina
- Natural Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology , Hyderabad - 500 007, India
| | - S Gopal Reddy
- Natural Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology , Hyderabad - 500 007, India
| | - V Hanuman Reddy
- Natural Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology , Hyderabad - 500 007, India
| | - Kiran Kumar Singarapu
- Natural Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology , Hyderabad - 500 007, India
| | - Balasubramanian Sridhar
- Natural Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology , Hyderabad - 500 007, India
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20
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Gharpure SJ, Prasath V, Kumar V. Stereoselective synthesis of 2,3-disubstituted indoline, pyrrolidine and cyclic ether-fused 1,2-dihydroquinoline derivatives using alkyne iminium ion cyclization of vinylogous carbamates: switch of regioselectivity using an internal hydroxy group as a nucleophile. Chem Commun (Camb) 2015; 51:13623-6. [DOI: 10.1039/c5cc05292k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
TMSOTf promoted alkyne iminium ion cyclization of vinylogous carbamates gives stereoselective access to indolines, pyrrolidines and dihydroquinolines.
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Affiliation(s)
- Santosh J. Gharpure
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076
- India
| | - V. Prasath
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076
- India
| | - Vinod Kumar
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076
- India
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21
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Gharpure SJ, Shelke YG, Reddy SRB. Synthesis of isochromene derivatives using an intramolecular benzylic C(sp3)–C(sp2) bond forming Heck reaction on vinylogous carbonates. RSC Adv 2014. [DOI: 10.1039/c4ra08421g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
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22
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Gharpure SJ, Prasad JVK, Bera K. Tandem Nucleophilic Addition/Oxa-Michael Reaction for the Synthesis ofcis-2,6-Disubstituted Tetrahydropyrans. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402199] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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23
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Thaharn W, Soorukram D, Kuhakarn C, Tuchinda P, Reutrakul V, Pohmakotr M. Radical Cyclization/ipso-1,4-Aryl Migration Cascade: Asymmetric Synthesis of 3,3-Difluoro-2-propanoylbicyclo[3.3.0]octanes. Angew Chem Int Ed Engl 2014; 53:2212-5. [DOI: 10.1002/anie.201310747] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Indexed: 11/12/2022]
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24
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Thaharn W, Soorukram D, Kuhakarn C, Tuchinda P, Reutrakul V, Pohmakotr M. Radical Cyclization/ipso-1,4-Aryl Migration Cascade: Asymmetric Synthesis of 3,3-Difluoro-2-propanoylbicyclo[3.3.0]octanes. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201310747] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Gharpure SJ, Prasath V. Stereoselective synthesis of C-fused pyranoindoles, pyranobenzofurans and pyranobenzothiophene scaffolds using oxa-Pictet–Spengler type reaction of vinylogous carbonates. Org Biomol Chem 2014; 12:7397-409. [DOI: 10.1039/c4ob01387e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
C-fused pyranoheterocycles can be assembled in a highly diastereoselective manner using an intramolecular oxa-Pictet–Spengler type reaction of vinylogous carbonates.
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Affiliation(s)
- Santosh J. Gharpure
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076, India
| | - V. Prasath
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076, India
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26
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Synthesis of 2,8-Dioxabicyclo[3.3.1]nonane Derivatives via a Sequential Knoevenagel Condensation and Hetero-Diels–Alder Reaction in an Aqueous Medium. J Org Chem 2013; 78:11612-7. [DOI: 10.1021/jo401990h] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Tejedor D, Álvarez-Méndez SJ, López-Soria JM, Martín VS, García-Tellado F. A Robust and General Protocol for the Lewis-Base-Catalysed Reaction of Alcohols and Alkyl Propiolates. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301303] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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28
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Gharpure SJ, Reddy SRB. Stereoselective Synthesis of Benzoxepines through Tandem Alkylation/Michael Addition to Vinylogous Carbonates. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300267] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Rajesh R, Raghunathan R. Synthesis of β-Lactam-Tethered Polycyclic Fused Heterocycles through a Rearrangement by a One-Pot Tandem [3+2] Cycloaddition Reaction. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201471] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Gharpure SJ, Prasad JVK. Stereoselective Synthesis of Substituted 1,4-Oxazepanes by Intramolecular Reductive Etherification. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300135] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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An J, Lu LQ, Yang QQ, Wang T, Xiao WJ. Enantioselective Construction of Oxa- and Aza-Angular Triquinanes through Tandem [4 + 1]/[3 + 2] Cycloaddition of Sulfur Ylides and Nitroolefins. Org Lett 2013; 15:542-5. [DOI: 10.1021/ol303363r] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jing An
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan, Hubei 430079, China
| | - Liang-Qiu Lu
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan, Hubei 430079, China
| | - Qing-Qing Yang
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan, Hubei 430079, China
| | - Tao Wang
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan, Hubei 430079, China
| | - Wen-Jing Xiao
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan, Hubei 430079, China
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Gharpure SJ, Sathiyanarayanan AM, Vuram PK. Hetero Diels–Alder reaction of olefin with o-quinone methides generated using (±)-binolphosphoric acid for the stereoselective synthesis of 2,4-diarylbenzopyrans: application to the formal synthesis of myristinin B/C. RSC Adv 2013. [DOI: 10.1039/c3ra43526a] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Duan Z, Zhang Z, Qian P, Han J, Pan Y. Asymmetric Morita–Baylis–Hillman reaction of isatins with α,β-unsaturated γ-butyrolactam as the nucleophile. RSC Adv 2013. [DOI: 10.1039/c3ra41115j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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