1
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Chen M, Zhu L, Zheng W, Fu Y, Zhang J, He H, Antilla JC. Catalytic Asymmetric Desymmetrization of Cyclic 1,3-Diketones Using Chiral Boro-phosphates. Org Lett 2024; 26:3951-3956. [PMID: 38678546 DOI: 10.1021/acs.orglett.4c01195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2024]
Abstract
Herein, we report a chiral boro-phosphate-catalyzed reductive amination for the desymmetrization of 2,2-disubstituted 1,3-cyclopentadiones with pinacolborane as the reducing agent, delivering chiral β-amino ketones with an all-carbon quaternary stereocenter in good yields (≤94%), high enantioselectivities (≤97% ee), and excellent diastereoselectivities (>20:1 dr). This reaction has a broad substrate scope and high functional group tolerance. The importance of the chiral products was also demonstrated through the preparation of multifunctional building blocks and heterocycles.
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Affiliation(s)
- Minglei Chen
- School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, P. R. China
| | - Linfei Zhu
- School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, P. R. China
| | - Weitao Zheng
- School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, P. R. China
| | - Yili Fu
- School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, P. R. China
| | - Junru Zhang
- School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, P. R. China
| | - Hualing He
- School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, P. R. China
| | - Jon C Antilla
- School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, P. R. China
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2
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Jang D, Choi M, Chen J, Lee C. Enantioselective Total Synthesis of (+)-Garsubellin A. Angew Chem Int Ed Engl 2021; 60:22735-22739. [PMID: 34398517 PMCID: PMC8519110 DOI: 10.1002/anie.202109193] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Revised: 08/05/2021] [Indexed: 01/03/2023]
Abstract
Garsubellin A is a meroterpene capable of enhancing the enzyme choline acetyltransferase whose decreased level is believed to play a central role in the symptoms of Alzheimer's disease. Due to the potentially useful biological activity together with the novel bridged and fused cyclic molecular architecture, garsubellin A has garnered substantial synthetic interest, but its absolute stereostructure has been undetermined. We report here the first enantioselective total synthesis of (+)-garsubellin A. Our synthesis relies on stereoselective fashioning of a cyclohexanone framework and double conjugate addition of 1,2-ethanedithiol that promotes aldol cyclization to build the bicyclic [3.3.1] skeleton. The twelve-step, protecting group-free synthetic route has enabled the syntheses of both the natural (-)-garsubellin A and its unnatural (+)-antipode for biological evaluations.
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Affiliation(s)
- Dongseok Jang
- Department of ChemistrySeoul National UniversitySeoul08826Republic of Korea
| | - Minchul Choi
- Department of ChemistrySeoul National UniversitySeoul08826Republic of Korea
| | - Jinglong Chen
- Department of ChemistryPrinceton UniversityPrincetonNew Jersey08540USA
- Current address: College of Materials Science and EngineeringFuzhou UniversityFuzhou350108China
| | - Chulbom Lee
- Department of ChemistrySeoul National UniversitySeoul08826Republic of Korea
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3
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Jang D, Choi M, Chen J, Lee C. Enantioselective Total Synthesis of (+)‐Garsubellin A. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Dongseok Jang
- Department of Chemistry Seoul National University Seoul 08826 Republic of Korea
| | - Minchul Choi
- Department of Chemistry Seoul National University Seoul 08826 Republic of Korea
| | - Jinglong Chen
- Department of Chemistry Princeton University Princeton New Jersey 08540 USA
- Current address: College of Materials Science and Engineering Fuzhou University Fuzhou 350108 China
| | - Chulbom Lee
- Department of Chemistry Seoul National University Seoul 08826 Republic of Korea
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4
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Zhang Y, Liu J, Zhang X. Organocatalytic Enantioselective Michael‐Aldol[3+2] Annulation for the Synthesis of Nitro‐Methanobenzo[7] annulenes. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yang Zhang
- College of Materials and Chemistry&Chemical Engineering Chengdu University of Technology 1 East Third Road, Erxianqiao, Chenghua District, Chengdu City Sichuan Province Chengdu 610059 P.R. China
| | - Jin‐Yu Liu
- College of Materials and Chemistry&Chemical Engineering Chengdu University of Technology 1 East Third Road, Erxianqiao, Chenghua District, Chengdu City Sichuan Province Chengdu 610059 P.R. China
| | - Xiao‐Hai Zhang
- State Key Laboratory of Applied Organic Chemistry School of Chemistry and Chemical Engineering Lanzhou University 222# Tianshui South Road Lanzhou 730000 P.R. China
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5
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Liao Z, Zhang J, Cao T, Zhu S. Copper-Catalyzed Asymmetric Synthesis of Bicyclo[3. n.1]alkenones. J Org Chem 2021; 86:5388-5400. [PMID: 33754724 DOI: 10.1021/acs.joc.1c00146] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of highly strained bicyclo[3.n.1]alkenones have been successfully constructed in good-to-excellent enantioselectivities and moderate-to-good yields via copper-catalyzed formal [3+3] cycloaddition. The versatile chiral cycloadducts could be selectively converted into various valuable bridge systems, which hold considerable potential for the construction of natural and bioactive compounds containing a [3.n.1] moiety.
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Affiliation(s)
- Zhehui Liao
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China
| | - Jiantao Zhang
- College of Chemistry, Guangdong University of Petrochemical Technology, Guandu Road, Maoming 525000, People's Republic of China
| | - Tongxiang Cao
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China
| | - Shifa Zhu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China
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6
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Yang Z, Yue Q, Yang M, Zhang H, Cui X. Ru(II)-Catalyzed Tunable Cascade Reaction via C–H/C–C Bond Cleavage. J Org Chem 2020; 85:12960-12970. [DOI: 10.1021/acs.joc.0c01614] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Zi Yang
- Department Engineering Research Centre of Molecular Medicine of Ministry of Education, Key Laboratory of Fujian Molecular Medicine, Key Laboratory of Xiamen Marine and Gene Drugs, Key Laboratory of Precision Medicine and Molecular Diagnosis of Fujian Universities, School of Biomedical Sciences, Huaqiao University, Xiamen 361021, P. R. China
| | - Qi Yue
- Department Engineering Research Centre of Molecular Medicine of Ministry of Education, Key Laboratory of Fujian Molecular Medicine, Key Laboratory of Xiamen Marine and Gene Drugs, Key Laboratory of Precision Medicine and Molecular Diagnosis of Fujian Universities, School of Biomedical Sciences, Huaqiao University, Xiamen 361021, P. R. China
| | - Mengqi Yang
- Department Engineering Research Centre of Molecular Medicine of Ministry of Education, Key Laboratory of Fujian Molecular Medicine, Key Laboratory of Xiamen Marine and Gene Drugs, Key Laboratory of Precision Medicine and Molecular Diagnosis of Fujian Universities, School of Biomedical Sciences, Huaqiao University, Xiamen 361021, P. R. China
| | - Hong Zhang
- Department Engineering Research Centre of Molecular Medicine of Ministry of Education, Key Laboratory of Fujian Molecular Medicine, Key Laboratory of Xiamen Marine and Gene Drugs, Key Laboratory of Precision Medicine and Molecular Diagnosis of Fujian Universities, School of Biomedical Sciences, Huaqiao University, Xiamen 361021, P. R. China
| | - Xiuling Cui
- Department Engineering Research Centre of Molecular Medicine of Ministry of Education, Key Laboratory of Fujian Molecular Medicine, Key Laboratory of Xiamen Marine and Gene Drugs, Key Laboratory of Precision Medicine and Molecular Diagnosis of Fujian Universities, School of Biomedical Sciences, Huaqiao University, Xiamen 361021, P. R. China
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7
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Donthoju A, Magham LR, Singh N, Manjula N, Chegondi R. Enantioselective Desymmetrization of Prochiral Cyclopentene-1,3-diones Triggered by Remote C(sp2)–N Bond Formation. J Org Chem 2019; 84:15735-15744. [DOI: 10.1021/acs.joc.9b02411] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Ashok Donthoju
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Lakshmi Revati Magham
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Neetu Singh
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Nemali Manjula
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Rambabu Chegondi
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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8
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Pasha MA, Krishna AV, Ashok E, Ramachary DB. Organocatalytic Reductive Propargylation: Scope and Applications. J Org Chem 2019; 84:15399-15416. [DOI: 10.1021/acs.joc.9b02415] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Mohammed Anif Pasha
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - A. Vamshi Krishna
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Etikala Ashok
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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9
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Verma GK, Rawat M, Rawat DS. Cobalt-Catalysed C-C Bond Formation and [2+2+2] Annulation of 1,3-Dicarbonyls to Terminal Alkynes. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900725] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
| | - Manish Rawat
- Department of Chemistry; University of Delhi; Delhi - 110 007 India
| | - Diwan S. Rawat
- Department of Chemistry; University of Delhi; Delhi - 110 007 India
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10
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Jadhav SB, Thopate SB, Nanubolu JB, Chegondi R. Rh-Catalyzed diastereoselective desymmetrization of enone tethered-cyclohexadienones via tandem arylative cyclization. Org Biomol Chem 2019; 17:1937-1946. [DOI: 10.1039/c8ob02284d] [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
The rhodium-catalyzed arylative cyclization of enone tethered-cyclohexadienones has been developed with high efficiency, thus providing cis-fused bicyclic enones in good yields and with excellent diastereoselectivities.
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Affiliation(s)
- Sandip B. Jadhav
- Department of Organic Synthesis & Process Chemistry
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Satish B. Thopate
- Department of Organic Synthesis & Process Chemistry
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Jagadeesh Babu Nanubolu
- Department of Organic Synthesis & Process Chemistry
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Rambabu Chegondi
- Department of Organic Synthesis & Process Chemistry
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
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11
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Hunter AC, Schlitzer SC, Stevens JC, Almutwalli B, Sharma I. A Convergent Approach to Diverse Spiroethers through Stereoselective Trapping of Rhodium Carbenoids with Gold-Activated Alkynols. J Org Chem 2018; 83:2744-2752. [DOI: 10.1021/acs.joc.7b03196] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Arianne C. Hunter
- Department of Chemistry and
Biochemistry, and Institute of Natural Products Applications and Research
Technologies, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73071,United States
| | - Steven C. Schlitzer
- Department of Chemistry and
Biochemistry, and Institute of Natural Products Applications and Research
Technologies, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73071,United States
| | - Joseph C. Stevens
- Department of Chemistry and
Biochemistry, and Institute of Natural Products Applications and Research
Technologies, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73071,United States
| | - Bilal Almutwalli
- Department of Chemistry and
Biochemistry, and Institute of Natural Products Applications and Research
Technologies, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73071,United States
| | - Indrajeet Sharma
- Department of Chemistry and
Biochemistry, and Institute of Natural Products Applications and Research
Technologies, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73071,United States
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12
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Goli N, Kallepu S, Mainkar PS, Lakshmi JK, Chegondi R, Chandrasekhar S. Synthetic Strategy toward the Pentacyclic Core of Melodinus Alkaloids. J Org Chem 2018; 83:2244-2249. [DOI: 10.1021/acs.joc.7b03138] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Navya Goli
- Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
| | | | | | | | - Rambabu Chegondi
- Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
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13
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Gollapelli KK, Donikela S, Manjula N, Chegondi R. Rhodium-Catalyzed Highly Regio- and Enantioselective Reductive Cyclization of Alkyne-Tethered Cyclohexadienones. ACS Catal 2018. [DOI: 10.1021/acscatal.7b04054] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
| | - Sangeetha Donikela
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110025, India
| | | | - Rambabu Chegondi
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110025, India
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14
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Reddy CR, Yarlagadda S, Sridhar B, Reddy BVS. Arylative Cyclization of Indole-1-carboxamides with 1,6-Enynes for the Synthesis of Polycyclic Indole Scaffolds. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701029] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Chatrala Ravikumar Reddy
- Centre for Semiochemicals; CSIR - Indian Institute of Chemical Technology; 500007 Hyderabad India
| | - Suresh Yarlagadda
- Centre for Semiochemicals; CSIR - Indian Institute of Chemical Technology; 500007 Hyderabad India
| | - Balasubramanian Sridhar
- Laboratory of X-ray Crystallography; CSIR - Indian Institute of Chemical Technology; 500007 Hyderabad India
| | - Basi V. Subba Reddy
- Centre for Semiochemicals; CSIR - Indian Institute of Chemical Technology; 500007 Hyderabad India
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15
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Ramachary DB, Anif Pasha M, Thirupathi G. Organocatalytic Asymmetric Formal [3+2] Cycloaddition as a Versatile Platform to Access Methanobenzo[7]annulenes. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201706557] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - Mohammed Anif Pasha
- Catalysis Laboratory; School of Chemistry; University of Hyderabad; Hyderabad 500 046 India
| | - Guguloth Thirupathi
- Catalysis Laboratory; School of Chemistry; University of Hyderabad; Hyderabad 500 046 India
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16
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Ramachary DB, Anif Pasha M, Thirupathi G. Organocatalytic Asymmetric Formal [3+2] Cycloaddition as a Versatile Platform to Access Methanobenzo[7]annulenes. Angew Chem Int Ed Engl 2017; 56:12930-12934. [PMID: 28783234 DOI: 10.1002/anie.201706557] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Revised: 07/30/2017] [Indexed: 11/12/2022]
Abstract
Pharmaceutically and structurally important methanobenzo[7]annulenes were synthesized in very good yields with excellent enantio- and diastereoselectivities through an unprecedented organocatalytic formal [3+2] cycloaddition from readily available 2-alkyl-3-hydroxynaphthalene-1,4-diones and alkyl vinyl ketones.
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Affiliation(s)
| | - Mohammed Anif Pasha
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad, 500 046, India
| | - Guguloth Thirupathi
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad, 500 046, India
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17
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Anugu RR, Chegondi R. Tunable Diastereoselective Desymmetrization of Cyclohexadienones Triggered by Copper-Catalyzed Three-Component Coupling Reaction. J Org Chem 2017; 82:6786-6794. [DOI: 10.1021/acs.joc.7b00936] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Raghunath Reddy Anugu
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Division
of Natural Product Chemistry, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), New
Delhi 110020, India
| | - Rambabu Chegondi
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Division
of Natural Product Chemistry, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), New
Delhi 110020, India
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18
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Gollapelli KK, Kallepu S, Govindappa N, Nanubolu JB, Chegondi R. Carbonyl-assisted reverse regioselective cascade annulation of 2-acetylenic ketones triggered by Ru-catalyzed C-H activation. Chem Sci 2016; 7:4748-4753. [PMID: 30155126 PMCID: PMC6016575 DOI: 10.1039/c6sc01456a] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 04/12/2016] [Indexed: 01/08/2023] Open
Abstract
The first reverse regioselective intermolecular annulation of aryl substituted 2-acetylenic ketones with O-substituted N-hydroxybenzamides or acrylamides followed by tandem cyclization via ruthenium-catalyzed C-H activation, is reported. Excellent reverse selectivity of alkyne insertion was induced by the weak coordination between the carbonyl group and ruthenium complex. This highly efficient and practical reaction has a broad range of substrate scope with excellent functional-group tolerance. The tandem reaction provides a wide range of polycyclic products that have an indozilidine structural motif, and are found to potentially be synthetically and pharmaceutically valuable.
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Affiliation(s)
- Krishna Kumar Gollapelli
- Division of Natural Product Chemistry , CSIR-Indian Institute of Chemical Technology , Hyderabad 500007 , India .
| | - Shivakrishna Kallepu
- Division of Natural Product Chemistry , CSIR-Indian Institute of Chemical Technology , Hyderabad 500007 , India .
| | - Nagendra Govindappa
- Division of Natural Product Chemistry , CSIR-Indian Institute of Chemical Technology , Hyderabad 500007 , India .
| | - Jagadeesh Babu Nanubolu
- Centre for X-ray Crystallography , CSIR-Indian Institute of Chemical Technology , Hyderabad 500007 , India
| | - Rambabu Chegondi
- Division of Natural Product Chemistry , CSIR-Indian Institute of Chemical Technology , Hyderabad 500007 , India .
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