1
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Karunakar GV, Bharath Kumar P, Rami Reddy PV, Sunil K, Emmaniel Raju C, Sridhar B. Gold(I)-Catalyzed Regioselective Synthesis of Indenylidene Derivatives via 1,5-Acryl Migration. Chem Asian J 2024; 19:e202400310. [PMID: 38715395 DOI: 10.1002/asia.202400310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Revised: 05/06/2024] [Indexed: 06/12/2024]
Abstract
A novel gold (I)-catalyzed synthetic strategy has been achieved for an efficient construction of indenylidene derivatives from substituted 1,6-diynes. This reaction describes the unique reactivity of gold catalysis in facilitating the intramolecular [3,3]-sigmatropic rearrangement, 5-exo dig cyclization followed by 1,5-migration of acryl group, resulting in the formation of substituted indenylidenes. Various substituted indenylidenes were successfully synthesized with up to 92 % yields. In this protocol, two new C-C bonds were sequentially formed atom economically in one pot.
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Affiliation(s)
- Galla V Karunakar
- Fluoro Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India
- Academy of Scientific and Innovative Research, 201002, Ghaziabad, India
| | - Perla Bharath Kumar
- Fluoro Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India
- Academy of Scientific and Innovative Research, 201002, Ghaziabad, India
| | - Pammi Venkata Rami Reddy
- Fluoro Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India
- Academy of Scientific and Innovative Research, 201002, Ghaziabad, India
| | - Komalla Sunil
- Fluoro Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India
- Academy of Scientific and Innovative Research, 201002, Ghaziabad, India
| | - Chittala Emmaniel Raju
- Fluoro Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India
- Academy of Scientific and Innovative Research, 201002, Ghaziabad, India
| | - Balasubramanian Sridhar
- Centre for X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India
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2
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Sreenivasulu G, Sridhar B, Karunakar GV. Dual gold-catalyzed regioselective synthesis of benzofulvenes via 5- endo dig cyclization. Org Biomol Chem 2023; 21:7799-7807. [PMID: 37712351 DOI: 10.1039/d3ob01079a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/16/2023]
Abstract
An efficient dual gold-catalyzed regioselective synthesis of benzofulvenes has been developed from substituted allyloxy 1,5-diynes via 5-endo dig cyclization. In this intramolecular organic transformation a new C-C bond formation occurs and moderate to very good yields are obtained in one pot.
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Affiliation(s)
- Gottam Sreenivasulu
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.
- Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
| | - Balasubramanian Sridhar
- Center for X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
| | - Galla V Karunakar
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.
- Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
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3
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Chen LL, Li F, Yang Q, Ye YF, Yang WW, Wang YB. Base-Promoted Decarboxylative Annulation of Methyl 2-(2-Bromophenyl)acetates and Ynones to Access Benzoxepines. J Org Chem 2023. [PMID: 36799925 DOI: 10.1021/acs.joc.2c02870] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
A simple and efficient base-mediated decarboxylative annulation of ynones with methyl 2-(2-bromophenyl)acetates has been developed. A broad range of benzoxepines were prepared with a broad substrate scope and high regioselectivity in moderate to excellent yields under transition-metal-free conditions. This method proceeds through a tandem [2 + 4] annulation, ring-opening decarboxylative reaction, and the intramolecular nucleophilic aromatic substitution reaction. Additionally, the key intermediates were successfully obtained and characterized unambiguously by single-crystal X-ray crystallography, which could favorably support a decarboxylative annulation mechanism. Furthermore, gram-scale reaction and synthetic applications for the further functionalization are also studied.
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Affiliation(s)
- Lu-Lu Chen
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Feng Li
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Qing Yang
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Ya-Fang Ye
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Wan-Wan Yang
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Yan-Bo Wang
- Henan Engineering Research Center of Functional Materials and Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
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4
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Prakash M, Samanta S. Base-promoted cyclization of ortho-hydroxyacetophenones with in situ generated cyclopropenes: diastereoselective access to spirobenzo[ b]oxepines and related precursors. Org Biomol Chem 2023; 21:2001-2014. [PMID: 36789745 DOI: 10.1039/d3ob00077j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
An unprecedented [5 + 2] spirocyclization route to obtain a vital class of functionalized spirobenzo[b]oxepine-cyclopropanes in good to high yields with excellent diastereoselectivities is reported. This domino reaction proceeds through a regioselective oxa-Michael addition of ortho-hydroxyacetophenones as 1,5-binucleophiles to in situ produced highly reactive cyclopropenes from 2-aroyl-1-chlorocyclopropanecarboxylates triggered by Cs2CO3 and the subsequent intramolecular aldol reaction under heating conditions, enabling the formation of new C-O and C-C bonds for benzo[b]oxepine ring synthesis. Moreover, at ambient temperature, the above C-O/C-C bond-forming event takes place preferentially via a [4 + 2] annulation path over a spirocyclization route, leading to substituted fused-cyclopropanes with good diastereoselectivities. Gratifyingly, further alterations of the obtained spirobenzo[b]oxepines and tetrahydrocyclopropa[b]chromenes afford fascinating classes of 4H-chromen-4-ones and cyclopenta[c]chromenes, respectively, under metal-free conditions.
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Affiliation(s)
- Meher Prakash
- Indian Institute of Technology Indore, Discipline of Chemistry, 453552, Indore, India.
| | - Sampak Samanta
- Indian Institute of Technology Indore, Discipline of Chemistry, 453552, Indore, India.
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5
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Mandal M, Pradhan R, Lourderaj U, Balamurugan R. Dodging the Conventional Reactivity of o-Alkynylanilines under Gold Catalysis for Distal 7- endo- dig Cyclization. J Org Chem 2023; 88:2260-2287. [PMID: 36744758 DOI: 10.1021/acs.joc.2c02668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A direct ring-closing strategy involving a less facile 7-endo-dig carbacyclization of o-alkynylaniline derivatives for the synthesis of benzo[b]azepines has been presented. The trivial well-documented 5-endo-dig cyclization in o-alkynylaniline derivatives due to high nucleophilicity of nitrogen has been overcome by using their vinylogous amides under gold catalysis to access a wide array of benzo[b]azepines in an atom economical way with excellent functional group compatibility. Deuterium scrambling experiments and DFT studies favor a mechanism involving stabilizing conformational change of the initially formed seven-membered vinyl gold intermediate through a key cyclopropyl gold carbene intermediate and its subsequent protodeauration mediated by the counter anion.
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Affiliation(s)
- Mou Mandal
- School of Chemistry, University of Hyderabad, Hyderabad, Telangana-500046, India
| | - Renuka Pradhan
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI, P.O. Jatni, Khurda, Odisha-752050, India
| | - Upakarasamy Lourderaj
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI, P.O. Jatni, Khurda, Odisha-752050, India
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6
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Karunakar GV, Sunil K, Bharath Kumar P, Chandrappa M, Guduru R, Kantevari S, Sridhar B. Catalyst- and Additive-Free Methodical Ring Expansion Protocol to Access Benzooxepino-Fused Pyrroles. Chem Asian J 2023; 18:e202201071. [PMID: 36567599 DOI: 10.1002/asia.202201071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 12/22/2022] [Accepted: 12/23/2022] [Indexed: 12/27/2022]
Abstract
An efficient metal-free, additive-free synthetic method was developed to access benzooxepino-fused pyrrole derivatives from alkynyl substituted aziridines. In this organic transformation, two new C-C bonds were formed via initial cleavage of C-C bond of aziridine ring by in situ generated azomethine ylides. Moderate to excellent yields of benzooxepino-fused pyrroles were obtained atom economically in the presence of t-BuOH in one-pot.
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Affiliation(s)
- Galla V Karunakar
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India.,Academy of Scientific and Innovative Research, 201002, Ghaziabad, India
| | - Komalla Sunil
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India.,Academy of Scientific and Innovative Research, 201002, Ghaziabad, India
| | - Perla Bharath Kumar
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India.,Academy of Scientific and Innovative Research, 201002, Ghaziabad, India
| | - Muneppa Chandrappa
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India
| | - Ravinder Guduru
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India
| | - Srinivas Kantevari
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India.,Academy of Scientific and Innovative Research, 201002, Ghaziabad, India
| | - Balasubramanian Sridhar
- Centre for X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India
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7
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Sreenivasulu G, Raju CE, Palaci MS, Sridhar B, Karunakar GV. Synthesis of Isoquinoline-Derived Diene Esters and Quinolin-2(1 H)-ylidene-Substituted 1,5-Diones from Enynones and (Iso) Quinoline N-Oxides. Org Lett 2023; 25:115-119. [PMID: 36583558 DOI: 10.1021/acs.orglett.2c03915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
An efficient synthetic method was developed to access isoquinoline-derived diene esters from enynones and isoquinoline-N-oxides in an atom-economic manner. The isoquinoline-substituted diene esters were obtained in moderate to excellent yields via [3 + 2]-cycloaddition and isoxazole ring opening followed by a [1,5]-sigmatropic rearrangement reaction, which resulted in one C-C and two C-O bond formations. Further, quinolin-2(1H)-ylidene-substituted 1,5-diones were achieved by reaction of enynones with quinoline-N-oxides in very good to high yields.
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Affiliation(s)
- Gottam Sreenivasulu
- Fluoro and Agrochemicals Division, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.,Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
| | - Chittala Emmaniel Raju
- Fluoro and Agrochemicals Division, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.,Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
| | - Manda Shareni Palaci
- Fluoro and Agrochemicals Division, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
| | - Balasubramanian Sridhar
- Center for X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
| | - Galla V Karunakar
- Fluoro and Agrochemicals Division, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.,Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
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8
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Bharath Kumar P, Raju CE, Chandubhai PH, Sridhar B, Karunakar GV. Gold(I)-Catalyzed Regioselective Cyclization to Access Cyclopropane-Fused Tetrahydrobenzochromenes. Org Lett 2022; 24:6761-6766. [DOI: 10.1021/acs.orglett.2c02564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Perla Bharath Kumar
- Fluoro and Agrochemicals Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | - Chittala Emmaniel Raju
- Fluoro and Agrochemicals Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | - Patel Hinal Chandubhai
- Fluoro and Agrochemicals Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Balasubramanian Sridhar
- Center for X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Galla V. Karunakar
- Fluoro and Agrochemicals Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
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9
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Mandal D, Kumar A, Patil NT. Gold catalysis in organic synthesis: fifteen years of research in India. PROCEEDINGS OF THE INDIAN NATIONAL SCIENCE ACADEMY 2022. [DOI: 10.1007/s43538-022-00106-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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10
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Zhou N, Xia Z, Kuang K, Xu Q, Zhao F, Wang L, Zhang M. Visible-Light-Induced Difluoroalkylation of 1-(Allyloxy)-2-(1-arylvinyl)benzenes and 1-(1-Arylvinyl)-2-(vinyloxy)benzenes: Synthesis of Bis-Difluoroalkylated Benzoxepines and 2 H-Chromenes. Org Lett 2022; 24:5791-5796. [PMID: 35916599 DOI: 10.1021/acs.orglett.2c02314] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel visible-light-mediated difluoroalkylation of 1-(allyloxy)-2-(1-arylvinyl)benzenes and 1-(1-arylvinyl)-2-(vinyloxy)benzenes for the synthesis of bis-difluoroalkylated benzoxepines and 2H-chromenes is developed. This method features mild reaction conditions, good regioselectivity, a wide substrate scope, good functional-group compatibility, and late-stage modification. Preliminary mechanistic studies reveal that the generation of the CF2CO2Et radical is more prone to reaction with the double bond of the aryl group.
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Affiliation(s)
- Nengneng Zhou
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Ziqin Xia
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Kaimo Kuang
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Qiankun Xu
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Fangli Zhao
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Lei Wang
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Man Zhang
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
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11
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Yu Q, Zhang J, Wu F, Liu X, Wang C, Zhang J, Rong L. Propargyl Chalcones' Radical Annulation/Sulfonation Reaction: Efficient Synthesis of Benzo[ b]oxepin-5(2 H)-one and Chromane Derivatives. J Org Chem 2022; 87:7136-7149. [PMID: 35607936 DOI: 10.1021/acs.joc.2c00361] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A novel and facile methodology for the synthesis of sulfonated benzo[b]oxepinone and chromane derivatives was reported by the reaction of propargyl chalcones with arylsulfonyl chloride via radical cascade annulation/sulfonation under laboratory conditions. Readily available propargyl chalcones, commercialized arylsulfonyl chloride, and simple reaction conditions make this six(seven)-membered oxygen-containing heterocycles' synthetic strategy more attractive and with significant application values.
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Affiliation(s)
- Qiuyu Yu
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, PR China
| | - Jinghang Zhang
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, PR China
| | - Fan Wu
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, PR China
| | - Xiaoqin Liu
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, PR China
| | - Chang Wang
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, PR China.,School of Pharmaceutical Sciences, Medical Science and Technology Innovation Center, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250117, Shandong, PR China
| | - Jinpeng Zhang
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Xuzhou 221004, Jiangsu, PR China
| | - Liangce Rong
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, PR China
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12
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Liu S, Hu W, Hao W, Xia J, Cai M. Regio- and Diastereoselective Construction of Functionalized Benzo[ b]oxepines and Benzo[ b]azepines via Recyclable Gold(I)-Catalyzed Cyclizations. J Org Chem 2022; 87:7239-7252. [PMID: 35593503 DOI: 10.1021/acs.joc.2c00446] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The heterogeneous gold-catalyzed cyclization of (o-alkynyl)phenoxy- or N-(o-alkynylphenyl)tolylsulfonamidoacrylates with alcohols has been developed by using an MCM-41-anchored diphenylphosphine-Au(I) complex [MCM-41-Ph2P-AuNTf2] as the catalyst under mild reaction conditions, yielding diverse functionalized benzo[b]oxepines or benzo[b]azepines with good to high yields and excellent diastereoselectivity. This heterogenized gold(I) catalyst exhibits a comparable activity to homogeneous Ph3PAuNTf2 and can be facilely recovered by a simple filtration of the reaction solution and reused more than seven times with almost a consistent catalytic efficiency.
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Affiliation(s)
- Siqi Liu
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Wenli Hu
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Wenyan Hao
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Jianhui Xia
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Mingzhong Cai
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
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13
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Raju CE, Balasubramanian S, Karunakar GV. Copper(I)-Catalyzed Formation of Isoquinoline and Quinoline Substituted Isobenzofurans. Org Lett 2022; 24:2899-2904. [DOI: 10.1021/acs.orglett.2c00864] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chittala Emmaniel Raju
- Fluoro and Agrochemicals Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India and
| | - Sridhar Balasubramanian
- Center for X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Galla V. Karunakar
- Fluoro and Agrochemicals Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India and
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14
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Karunakar GV, Raju CE, Sreenivasulu G, Bharath Kumar P, Kadiyala V, Sridhar B. Cationic gold-catalyzed intramolecular cyclization of substituted 1,5-diynes to access indenone derivatives. Chem Asian J 2022; 17:e202101408. [PMID: 35243791 DOI: 10.1002/asia.202101408] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 03/02/2022] [Indexed: 11/05/2022]
Abstract
An efficient intramolecular cyclization reaction was developed to achive indenone derivatives. The substituted 1,5-diyenes were converted to the cooresponding indenones via gold-catalyzed organic transformation and moderate to excellent yields of the title molecules were obatined via formation of two C=O and one C-C bonds under mild reaction condtions in one-pot.
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Affiliation(s)
- Galla V Karunakar
- CSIR-IICT, Crop Protection Chemicals Division, Uppal Road, Tarnaka, 500007, Hyderabad, INDIA
| | - Chittala Emmaniel Raju
- Indian Institute of Chemical Technology CSIR: Indian Institute of Chemical Technology, Chemistry, INDIA
| | - Gottam Sreenivasulu
- Indian Institute of Chemical Technology CSIR: Indian Institute of Chemical Technology, Chemistry, INDIA
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15
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Kadiyala V, Raju CE, Bania KK, Sridhar B, Karunakar GV. Gold (I)-Promoted Intermolecular Cascade Annulation to Access 2-Hydroxybenzocarbazoles via a Meyer-Schuster Rearrangement. Chem Asian J 2021; 17:e202101269. [PMID: 34874100 DOI: 10.1002/asia.202101269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/07/2021] [Indexed: 02/03/2023]
Abstract
An efficient cascade annulation protocol was established to access substituted 2-hydroxybenzocarbazoles from alkynylcyclohexadienones and substituted 2-aminophenols under gold catalysis. In this transformation a new C-C, two C-N bonds were formed sequentially and moderate to excellent yields of 2-hydroxybenzocarbazole derivatives were obtained selectively via Meyer-Schuster rearrangement in one-pot.
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Affiliation(s)
- Veerabhushanam Kadiyala
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India.,Academy of Scientific and Innovative Research, 201002, Ghaziabad, India
| | - Chittala Emmaniel Raju
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India.,Academy of Scientific and Innovative Research, 201002, Ghaziabad, India
| | - Kusum K Bania
- Department of Chemical Sciences, Tezpur University, 784028, Assam, India
| | - Balasubramanian Sridhar
- Centre for X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India
| | - Galla V Karunakar
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, 500007, Hyderabad, India.,Academy of Scientific and Innovative Research, 201002, Ghaziabad, India
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16
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Zhao Y, Guo X, Zhang R, Li S, Chen T, Sun X. CF 3CO 2H-Catalyzed Synthesis of 3-Alkynylpyrrole Derivatives and Their Controlled Reduction. J Org Chem 2021; 86:15568-15576. [PMID: 34648289 DOI: 10.1021/acs.joc.1c02078] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A transition-metal-free methodology employing nitroenynes and enaminones has been developed to access 3-alkynylpyrrole derivatives. This mild cyclization reaction might proceed through the nucleophilic addition, intramolecular cyclization, and the subsequent elimination processes. The protocol features a broad substrate scope, good selectivity, and functional group tolerance. Notably, the advantage of this method is also highlighted by the controlled reduction to generate alkenyl- or alkylpyrrole derivatives in good to excellent yields.
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Affiliation(s)
- Yulei Zhao
- Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Xuqiang Guo
- Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Ruihua Zhang
- Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Shuai Li
- Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Tingting Chen
- Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Xuejun Sun
- Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
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17
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Sreenivasulu G, Kadiyala V, Raju CE, Sridhar B, Karunakar GV. Gold‐Catalyzed Synthesis of Pyrazolo[1,5‐
a
]pyridines Regioselectively
via
6‐
endo‐dig
Cyclization. ChemistrySelect 2021. [DOI: 10.1002/slct.202102580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Gottam Sreenivasulu
- Division of Fluoro and Agrochemicals CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- Academy of Scientific and Innovative Research Ghaziabad 201002 India)
| | - Veerabhushanam Kadiyala
- Division of Fluoro and Agrochemicals CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- Academy of Scientific and Innovative Research Ghaziabad 201002 India)
| | - Chittala Emmaniel Raju
- Division of Fluoro and Agrochemicals CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- Academy of Scientific and Innovative Research Ghaziabad 201002 India)
| | - Balasubramanian Sridhar
- Centre for X-ray Crystallography CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India)
| | - Galla V. Karunakar
- Division of Fluoro and Agrochemicals CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- Academy of Scientific and Innovative Research Ghaziabad 201002 India)
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18
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Dalovai P, Karunakar GV, Damodaran Nadar V, Doddi VR, Kanaparthy S. Gold-catalyzed formation of substituted aminobenzophenone derivatives via intramolecular 6-endo-dig cyclization. J CHEM SCI 2021. [DOI: 10.1007/s12039-020-01860-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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19
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Emmaniel Raju C, Kadiyala V, Sreenivasulu G, Kumar PB, Sridhar B, Karunakar GV. Gold-catalyzed synthesis of 1 H-isochromene-4-carbaldehydes via oxidative cascade cyclization. Org Biomol Chem 2021; 19:3634-3643. [PMID: 33908556 DOI: 10.1039/d1ob00066g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient gold-catalyzed formation of indenylidene-derived 1H-isochromene-4-carbaldehydes from substituted 1,5,10-triyne-O-silanes was developed under mild reaction conditions. In this reaction, gold-catalyzed selective oxidation, 1,2-migration, nucleophilic addition and then 5-endo-dig cyclization took place regioselectively. The indenylidene-derived isochromene-4-carbaldehydes were synthesized in moderate to very good yields via the formation of new C-C and C-O bonds in one pot.
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Affiliation(s)
- Chittala Emmaniel Raju
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India. and Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
| | - Veerabhushanam Kadiyala
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India. and Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
| | - Gottam Sreenivasulu
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India. and Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
| | - Perla Bharath Kumar
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India. and Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
| | - Balasubramanian Sridhar
- Center for X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
| | - Galla V Karunakar
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India. and Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
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20
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Zhao Y, Guo X, Ding X, Zhou Z, Li M, Feng N, Gao B, Lu X, Liu Y, You J. Reductive CO2 Fixation via the Selective Formation of C–C Bonds: Bridging Enaminones and Synthesis of 1,4-Dihydropyridines. Org Lett 2020; 22:8326-8331. [DOI: 10.1021/acs.orglett.0c02963] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yulei Zhao
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, China
| | - Xuqiang Guo
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, China
| | - Xin Ding
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, China
| | - Zheng Zhou
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, China
| | - Man Li
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, China
| | - Nan Feng
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, China
| | - Bowen Gao
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, China
| | - Xu Lu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, China
| | - Yunlin Liu
- School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
| | - Jinmao You
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, China
- Northwest Institute of Plateau Biology, Chinese Academy of Science, Xining 810001, China
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21
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Kadiyala V, Kumar PB, Sunil K, Raju CE, Sridhar B, Karunakar GV. Gold(iii) promoted formation of dihydroquinazolinones: double X-H activation by gold. RSC Adv 2020; 10:35681-35691. [PMID: 35517079 PMCID: PMC9056963 DOI: 10.1039/d0ra06537d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 09/14/2020] [Indexed: 12/25/2022] Open
Abstract
An efficient 2-furyl gold-carbene promoted synthetic method was developed for the formation of dihydroquinazolinones from enynones by dual insertion of anthranilamides. In this organic transformation a new C-O and two C-N bond formations occurred and dihydroquinazolinones were obtained with a quaternary centre in moderate to very good yields in one-pot synthesis.
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Affiliation(s)
- Veerabhushanam Kadiyala
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- Academy of Scientific and Innovative Research Ghaziabad 201002 India
| | - Perla Bharath Kumar
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- Academy of Scientific and Innovative Research Ghaziabad 201002 India
| | - Komalla Sunil
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- Academy of Scientific and Innovative Research Ghaziabad 201002 India
| | - Chittala Emmaniel Raju
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- Academy of Scientific and Innovative Research Ghaziabad 201002 India
| | - Balasubramanian Sridhar
- Center for X-ray Crystallography, CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
| | - Galla V Karunakar
- Fluoro and Agrochemicals Department, CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- Academy of Scientific and Innovative Research Ghaziabad 201002 India
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22
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Thummala Y, Raju CE, Purnachandar D, Sreenivasulu G, Doddi VR, Karunakar GV. Gold‐Catalyzed Regioselective Synthesis of Pyrazolo[1,4]oxazepines via Intramolecular
7
‐
endo‐dig
Cyclization. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901852] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Yadagiri Thummala
- Fluoro and Agrochemicals Department CSIR‐Indian Institute of Chemical Technology 500007 Hyderabad India
- Academy of Scientific and Innovative Research 201002 Ghaziabad India
| | - Chittala Emmaniel Raju
- Fluoro and Agrochemicals Department CSIR‐Indian Institute of Chemical Technology 500007 Hyderabad India
- Academy of Scientific and Innovative Research 201002 Ghaziabad India
| | - Dalovai Purnachandar
- Fluoro and Agrochemicals Department CSIR‐Indian Institute of Chemical Technology 500007 Hyderabad India
- Academy of Scientific and Innovative Research 201002 Ghaziabad India
| | - Gottam Sreenivasulu
- Fluoro and Agrochemicals Department CSIR‐Indian Institute of Chemical Technology 500007 Hyderabad India
- Academy of Scientific and Innovative Research 201002 Ghaziabad India
| | - Venkata Ramana Doddi
- Department of Chemistry and Chemical Sciences Central University of Karnataka 585367 Kadaganchi Karnataka India
| | - Galla V. Karunakar
- Fluoro and Agrochemicals Department CSIR‐Indian Institute of Chemical Technology 500007 Hyderabad India
- Academy of Scientific and Innovative Research 201002 Ghaziabad India
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23
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Zhao Y, Guo X, Wang Z, Shen D, Chen T, Wu N, Yan S, You J. TBAF-Catalyzed Cyclization Reactions of o
-(Alkynyl)phenyl Propargyl Alcohols with Malonate Esters: A Possible Cation-π Interaction as The Activation Approach. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901790] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yulei Zhao
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Xuqiang Guo
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Zongkang Wang
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Duyi Shen
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Tingting Chen
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Nan Wu
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Shina Yan
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Jinmao You
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
- Northwest Institute of Plateau Biology; Chinese Academy of Science; 810001 Xining China
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24
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Zhao Y, Guo X, Du Y, Shi X, Yan S, Liu Y, You J. Synthesis of fused-tetrahydropyrimidines: one-pot methylenation–cyclization utilizing two molecules of CO2. Org Biomol Chem 2020; 18:6881-6888. [DOI: 10.1039/d0ob01504k] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A methylenation–cyclization reaction employing cyclic enaminones with primary aromatic amines and two molecules of CO2 to furnish fused-tetrahydropyrimidines has been developed.
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Affiliation(s)
- Yulei Zhao
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu
- China
| | - Xuqiang Guo
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu
- China
| | - Yulan Du
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu
- China
| | - Xinrui Shi
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu
- China
| | - Shina Yan
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu
- China
| | - Yunlin Liu
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou
- China
| | - Jinmao You
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu
- China
- Northwest Institute of Plateau Biology
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25
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Zhao Y, Liu X, Zheng L, Du Y, Shi X, Liu Y, Yan Z, You J, Jiang Y. One-Pot Methylenation–Cyclization Employing Two Molecules of CO2 with Arylamines and Enaminones. J Org Chem 2019; 85:912-923. [DOI: 10.1021/acs.joc.9b02858] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Yulei Zhao
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Xu Liu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Lijun Zheng
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Yulan Du
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Xinrui Shi
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Yunlin Liu
- School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
| | - Zhengquan Yan
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Jinmao You
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
- Northwest Institute of Plateau Biology, Chinese Academy of Science, Xining 810001, China
| | - Yuanye Jiang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
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26
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Cao D, Zhang K, An R, Xu H, Hao S, Yang X, Hou Z, Guo C. The Efficient Synthesis of Benzannulated Seven-Membered O-Heterocycles via the Intramolecular Ring-Opening Cyclization of Cyclopropanes. Org Lett 2019; 21:8948-8951. [PMID: 31674790 DOI: 10.1021/acs.orglett.9b03260] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient and practical approach for the synthesis of substituted benzannulated seven-membered O-heterocycles from cyclopropane derivatives is described. The transformation proceeds via Lewis acid mediated ring opening of cyclopropanes followed by a concomitant 7-endo-tet cyclization to furnish the 4-benzoyl-3,4-dihydrobenzo[b]oxepin-5(2H)-one derivatives in excellent yields (up to 92%). This potentially general method is featured by its high atom economy, broad substrate scope, and mild reaction conditions. Moreover, the representative products exhibited selective antifungal activity in vitro against the fungus Cryptococcus neoformans. Therefore, the present reaction will be useful for the development of novel antifungal therapeutic reagents.
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Affiliation(s)
- Dongpo Cao
- Key Laboratory of Structure-Based Drugs Design and Discovery (Ministry of Education), School of Pharmaceutical Engineering , Shenyang Pharmaceutical University , Shenyang 110016 China
| | - Kaipeng Zhang
- Key Laboratory of Structure-Based Drugs Design and Discovery (Ministry of Education), School of Pharmaceutical Engineering , Shenyang Pharmaceutical University , Shenyang 110016 China
| | - Ran An
- Key Laboratory of Structure-Based Drugs Design and Discovery (Ministry of Education), School of Pharmaceutical Engineering , Shenyang Pharmaceutical University , Shenyang 110016 China
| | - Hang Xu
- Key Laboratory of Structure-Based Drugs Design and Discovery (Ministry of Education), School of Pharmaceutical Engineering , Shenyang Pharmaceutical University , Shenyang 110016 China
| | - Shuang Hao
- Key Laboratory of Structure-Based Drugs Design and Discovery (Ministry of Education), School of Pharmaceutical Engineering , Shenyang Pharmaceutical University , Shenyang 110016 China
| | - Xiaoguang Yang
- Key Laboratory of Structure-Based Drugs Design and Discovery (Ministry of Education), School of Pharmaceutical Engineering , Shenyang Pharmaceutical University , Shenyang 110016 China
| | - Zhuang Hou
- Key Laboratory of Structure-Based Drugs Design and Discovery (Ministry of Education), School of Pharmaceutical Engineering , Shenyang Pharmaceutical University , Shenyang 110016 China
| | - Chun Guo
- Key Laboratory of Structure-Based Drugs Design and Discovery (Ministry of Education), School of Pharmaceutical Engineering , Shenyang Pharmaceutical University , Shenyang 110016 China
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27
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Kadiyala V, Bharath Kumar P, Balasubramanian S, Karunakar GV. Gold-Catalyzed Synthesis of 6-Hydroxyindoles from Alkynylcyclohexadienones and Substituted Amines. J Org Chem 2019; 84:12228-12236. [PMID: 31460758 DOI: 10.1021/acs.joc.9b02023] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient gold-catalyzed formation of 6-hydroxyindoles from substituted alkynylcyclohexadienones and amines have been developed. In this reaction two new C-N bonds were formed, and moderate to very good yields of the 6-hydroxyindole derivatives were obtained in one pot. This organic transformation tolerates a range of substituted alkynylcyclohexadienones and amines, which resulted in 6-hydroxyindole derivatives selectively.
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Affiliation(s)
- Veerabhushanam Kadiyala
- Fluoro and Agrochemicals Department , Academy of Scientific and Innovative Research , Ghaziabad 201002 , India
| | - Perla Bharath Kumar
- Fluoro and Agrochemicals Department , Academy of Scientific and Innovative Research , Ghaziabad 201002 , India
| | - Sridhar Balasubramanian
- Center for X-ray Crystallography , CSIR-Indian Institute of Chemical Technology , Hyderabad 500007 , India
| | - Galla V Karunakar
- Fluoro and Agrochemicals Department , Academy of Scientific and Innovative Research , Ghaziabad 201002 , India
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28
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Purnachandar D, Suneel K, Balasubramanian S, Karunakar GV. Gold-carbene assisted formation of tetraarylmethane derivatives: double X-H activation by gold. Org Biomol Chem 2019; 17:4856-4864. [PMID: 31038501 DOI: 10.1039/c9ob00470j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
An efficient gold-carbene promoted generation of tetraarylmethane derivatives from enynones and indoles was accomplished by the formation of a new C-O bond and two C-C bonds. It is significant that (2-furyl) gold-carbene assisted addition of two nucleophiles resulted in the formation of tetraarylmethane derivatives with a quaternary centre in moderate to good yields in one pot.
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Affiliation(s)
- Dalovai Purnachandar
- Department of Fluoro and Agrochemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.
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29
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Sultana S, Shim JJ, Kim SH, Lee YR. Silver(i)/base-promoted propargyl alcohol-controlled regio- or stereoselective synthesis of furan-3-carboxamides and (Z)-enaminones. Org Biomol Chem 2019; 16:6749-6759. [PMID: 30187059 DOI: 10.1039/c8ob01791c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A novel and facile regioselective synthesis of furan-3-carboxamides by a silver(i)/base-promoted reaction of propargyl alcohol with 3-oxo amides has been demonstrated. This one-pot protocol provides a rapid synthetic approach to diverse trisubstituted furan-3-carboxamides via cascade nucleophilic addition, intramolecular cyclization, elimination, and isomerization reactions. Employing a substituted propargyl alcohol, (Z)-enaminones have been obtained with high stereoselectivities by a Ag2CO3-promoted reaction starting from 3-oxo amides via C-N bond cleavage.
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Affiliation(s)
- Sabera Sultana
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
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30
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Nagaraju V, Raju CE, Purnachandar D, Rao VJ, Karunakar GV. Conversion ofO-Propargylβ-enones to 2-Allylidene 1,3-Diones and Furan Derivativesvia[3,3]-Sigmatropic Rearrangement. ChemistrySelect 2019. [DOI: 10.1002/slct.201803888] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Vemu Nagaraju
- Division of Fluoro and Agro Chemicals; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007 India
| | - Chittala Emmaniel Raju
- Division of Fluoro and Agro Chemicals; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007 India
- Academy of Scientific and Innovative Research; Ghaziabad- 201002 India
| | - Dalovai Purnachandar
- Division of Fluoro and Agro Chemicals; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007 India
- Academy of Scientific and Innovative Research; Ghaziabad- 201002 India
| | - Vaidya Jayathirtha Rao
- Division of Fluoro and Agro Chemicals; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007 India
| | - Galla V. Karunakar
- Division of Fluoro and Agro Chemicals; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007 India
- Academy of Scientific and Innovative Research; Ghaziabad- 201002 India
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31
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Du JY, Ma YH, Meng FX, Zhang RR, Wang RN, Shi HL, Wang Q, Fan YX, Huang HL, Cui JC, Ma CL. Lewis Base-Catalyzed [4 + 3] Annulation of ortho-Quinone Methides and MBH Carbonates: Synthesis of Functionalized Benzo[b]oxepines Bearing Oxindole Scaffolds. Org Lett 2019; 21:465-468. [DOI: 10.1021/acs.orglett.8b03709] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Ji-Yuan Du
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Yan-Hua Ma
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Fan-Xiao Meng
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Rui-Rui Zhang
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Ruo-Nan Wang
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Hong-Liang Shi
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Qi Wang
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Ya-Xin Fan
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Hong-Li Huang
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Ji-Chun Cui
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Chun-Lin Ma
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
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32
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Zhao Y, Zhang Z, Liu X, Wang Z, Cao Z, Tian L, Yue M, You J. TBAF-Catalyzed O-Nucleophilic Cyclization of Enaminones: A Process for the Synthesis of Dihydroisobenzofuran Derivatives. J Org Chem 2019; 84:1379-1386. [DOI: 10.1021/acs.joc.8b02842] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yulei Zhao
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Zheng Zhang
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Xu Liu
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Zongkang Wang
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Ziping Cao
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Laijin Tian
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Mingbo Yue
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Jinmao You
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
- Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Science, Xining, 810001, China
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33
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Sunil K, Thummala Y, Dalovai P, Balasubramanian S, Karunakar GV. A gold-catalyzed facile intramolecular rearrangement and cyclization sequence for synthesis of 2,5-dihydrofurans. Org Biomol Chem 2019; 17:6015-6024. [DOI: 10.1039/c9ob00756c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient gold-catalyzed intramolecular rearrangement and cyclization protocol was developed for synthesis of 2,5-dihydrofuran derivatives via formation of a new C–C and C–O bond with a quaternary centre.
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Affiliation(s)
- Komalla Sunil
- Department of Fluoro and Agrochemicals
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
| | - Yadagiri Thummala
- Department of Fluoro and Agrochemicals
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
- Academy of Scientific and Innovative Research
| | - Purnachandar Dalovai
- Department of Fluoro and Agrochemicals
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
- Academy of Scientific and Innovative Research
| | | | - Galla V. Karunakar
- Department of Fluoro and Agrochemicals
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
- Academy of Scientific and Innovative Research
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34
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Guduru R, Mangina NSVMR, Sridhar B, Karunakar GV. Gold-catalyzed formation of aryl-fused pyrazolooxazepines via intramolecular regioselective 7-exo-dig cyclization. Org Biomol Chem 2019; 17:2809-2817. [DOI: 10.1039/c8ob03157f] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient gold-catalyzed method was developed for the formation of aryl-fused pyrazolooxazepines from ortho-O-propargyl aryl pyrazoles via 7-exo-dig cyclization in good yields.
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Affiliation(s)
- Ravinder Guduru
- Division of Fluoro and Agrochemicals
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
- Academy of Scientific and Innovative Research
| | - N. S. V. M. Rao Mangina
- Division of Fluoro and Agrochemicals
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
- Academy of Scientific and Innovative Research
| | | | - Galla V. Karunakar
- Division of Fluoro and Agrochemicals
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
- Academy of Scientific and Innovative Research
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35
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Alyabyev SB, Beletskaya IP. Gold as a catalyst. Part II. Alkynes in the reactions of carbon–carbon bond formation. RUSSIAN CHEMICAL REVIEWS 2018. [DOI: 10.1070/rcr4815] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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36
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37
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Courant T, Pasco M, Lecourt T. Straightforward Entry toward Highly Substituted 2,3-Dihydrobenz[ b]oxepines by Ring Expansion of Benzopyryliums with Donor-Acceptor Diazo Compounds. Org Lett 2018; 20:2757-2761. [PMID: 29676921 DOI: 10.1021/acs.orglett.8b00984] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Ylide-type reactivity of diazo compounds is exploited in a new way to prepare benzo[ b]oxepines thanks to the formation of three chemical bonds and two contiguous and highly substituted stereocenters in a single pot. This cationic reaction cascade first involves addition of a donor-acceptor-substituted diazo compound to a benzopyrylium. Selective 1,2 migration of the endocyclic C-C bond then results in a ring-expansion and generates a second oxocarbenium that is trapped by a nucleophile added sequentially.
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Affiliation(s)
- Thibaut Courant
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS , COBRA UMR 6014 , 76000 Rouen , France
| | - Morgane Pasco
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS , COBRA UMR 6014 , 76000 Rouen , France
| | - Thomas Lecourt
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS , COBRA UMR 6014 , 76000 Rouen , France
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38
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Xiang H, Zhao QL, Xia PJ, Xiao JA, Ye ZP, Xie X, Sheng H, Chen XQ, Yang H. Visible-Light-Induced External Radical-Triggered Annulation To Access CF 2-Containing Benzoxepine Derivatives. Org Lett 2018; 20:1363-1366. [PMID: 29446953 DOI: 10.1021/acs.orglett.8b00131] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A facile and diversified synthesis of functionalized CF2-containing benzoxepine derivatives via photoredox catalysis was achieved in this work. This novel protocol features broad substrate scope, mild reaction conditions, operational simplicity, easy scale-up, and versatile derivatization, which would facilitate its practical and broad applications in the construction of valuable and synthetically challenging heterocycles.
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Affiliation(s)
- Haoyue Xiang
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
| | - Qing-Lan Zhao
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
| | - Peng-Ju Xia
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
| | - Jun-An Xiao
- College of Chemistry and Materials Science, Guangxi Teachers Education University , Nanning 530000, China
| | - Zhi-Peng Ye
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
| | - Xiong Xie
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
| | - Huan Sheng
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
| | - Xiao-Qing Chen
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
| | - Hua Yang
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
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39
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Kong XF, Zhan F, He GX, Pan CX, Gu CX, Lu K, Mo DL, Su GF. Gold-Catalyzed Selective 6-exo-dig and 7-endo-dig Cyclizations of Alkyn-Tethered Indoles To Prepare Rutaecarpine Derivatives. J Org Chem 2018; 83:2006-2017. [DOI: 10.1021/acs.joc.7b02956] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiang-Fei Kong
- State
Key Laboratory for Chemistry and Molecular Engineering of Medicinal
Resources, Ministry of Science and Technology of China, School of
Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
- College
of Chemistry and Bioengineering, Guilin University of Technology, 12 Jian Gan Road, Guilin 541004, China
| | - Feng Zhan
- State
Key Laboratory for Chemistry and Molecular Engineering of Medicinal
Resources, Ministry of Science and Technology of China, School of
Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Guo-Xue He
- State
Key Laboratory for Chemistry and Molecular Engineering of Medicinal
Resources, Ministry of Science and Technology of China, School of
Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Cheng-Xue Pan
- State
Key Laboratory for Chemistry and Molecular Engineering of Medicinal
Resources, Ministry of Science and Technology of China, School of
Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Chen-Xi Gu
- State
Key Laboratory for Chemistry and Molecular Engineering of Medicinal
Resources, Ministry of Science and Technology of China, School of
Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Ke Lu
- State
Key Laboratory for Chemistry and Molecular Engineering of Medicinal
Resources, Ministry of Science and Technology of China, School of
Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Dong-Liang Mo
- State
Key Laboratory for Chemistry and Molecular Engineering of Medicinal
Resources, Ministry of Science and Technology of China, School of
Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Gui-Fa Su
- State
Key Laboratory for Chemistry and Molecular Engineering of Medicinal
Resources, Ministry of Science and Technology of China, School of
Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
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40
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41
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Zhang JH, Wei Y, Shi M. Gold-catalyzed ring enlargement and cycloisomerization of alkynylamide tethered alkylidenecyclopropanes. Org Chem Front 2018. [DOI: 10.1039/c8qo00907d] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A gold(i)-catalyzed ring enlargement and cycloisomerization of alkynylamide tethered alkylidenecyclopropanes has been developed, providing facile access to functionalized polycyclic and spiropolycyclic products based on the use of gold(i) catalysts.
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Affiliation(s)
- Jia-hao Zhang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry & Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Yin Wei
- State Key Laboratory of Organometallic Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai
- China
| | - Min Shi
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry & Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
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42
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Kelgokmen Y, Cayan Y, Zora M. Zinc Chloride Mediated Synthesis of 1,4-Oxazepines fromN-Propargylic β-Enaminones. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701433] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yilmaz Kelgokmen
- Department of Chemistry; Middle East Technical University; 06800 Ankara Turkey
| | - Yasemin Cayan
- Department of Chemistry; Middle East Technical University; 06800 Ankara Turkey
| | - Metin Zora
- Department of Chemistry; Middle East Technical University; 06800 Ankara Turkey
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43
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Purnachandar D, Suneel K, Sridhar B, Karunakar GV. Silver-Catalyzed Synthesis of Substituted Carbazoles through a Tandem Intramolecular Hydroamination/Cyclization Sequence. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201700379] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dalovai Purnachandar
- Division of Crop Protection Chemicals; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007 India
- Academy of Scientific and Innovative Research; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007 India
| | - Kanaparthy Suneel
- Inorganic and Analytical Chemistry Department; Andhra University; Visakhapatnam 530003 India
| | - Balasubramanian Sridhar
- Centre for X-ray Crystallography; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007 India
| | - Galla V. Karunakar
- Division of Crop Protection Chemicals; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007 India
- Academy of Scientific and Innovative Research; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007 India
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44
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Goutham K, Kadiyala V, Sridhar B, Karunakar GV. Gold-catalyzed intramolecular cyclization/condensation sequence: synthesis of 1,2-dihydro[c][2,7]naphthyridines. Org Biomol Chem 2017; 15:7813-7818. [DOI: 10.1039/c7ob01285c] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
An efficient gold-catalyzed protocol for the construction of 1,2-dihydro[c][2,7]naphthyridines from 2-aminophenyl prop-2-yn-1-yl enaminones has been developed. In this organic transformation new C–C and C–N bonds were formedvia6-endo-dig cyclization and good to excellent yields were obtained in one-pot synthesis.
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Affiliation(s)
- Kommuru Goutham
- Crop Protection Chemicals Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
- Academy of Scientific and Innovative Research
| | - Veerabhushanam Kadiyala
- Crop Protection Chemicals Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
- Academy of Scientific and Innovative Research
| | | | - Galla V. Karunakar
- Crop Protection Chemicals Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
- Academy of Scientific and Innovative Research
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