1
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Meng S, Guo W, Liu J, Zheng J, Wang Q. A Tandem Prins/Friedel‐Crafts Cyclization Strategy for the Stereoselective Synthesis of Hexahydro‐2
H
‐benzo[
g
]chromenes. ChemistrySelect 2022. [DOI: 10.1002/slct.202202760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shuyu Meng
- Department of Chemistry Fudan University 2005 Songhu Road Shanghai 200438 China
| | - Wentao Guo
- Department of Chemistry Fudan University 2005 Songhu Road Shanghai 200438 China
| | - Jie Liu
- Department of Chemistry Fudan University 2005 Songhu Road Shanghai 200438 China
| | - Jie Zheng
- Department of Chemistry Fudan University 2005 Songhu Road Shanghai 200438 China
| | - Quanrui Wang
- Department of Chemistry Fudan University 2005 Songhu Road Shanghai 200438 China
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2
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Barakov R, Shcherban N, Petrov O, Lang J, Shamzhy M, Opanasenko M, Cejka J. MWW-type zeolite nanostructures for a one-pot three-component Prins–Friedel–Crafts reaction. Inorg Chem Front 2022. [DOI: 10.1039/d1qi01497h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One-pot Prins–Friedel–Crafts reaction of aldehydes, homoallylic alcohol and aromatics catalyzed by large-pore zeolites is an attractive environmentally friendly route towards valuable heterocyclic compounds containing 4 aryltetrahydropyran moiety. Herein, a catalytic...
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3
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Roy S. Prins-Friedel-Crafts Cyclization: Synthesis of Diversely Functionalized Six- Membered Oxacycles. CURR ORG CHEM 2021. [DOI: 10.2174/1385272825666210114105020] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Prins cyclization is a well-established synthetic protocol to generate a wide range
of important oxygen heterocycles. It is a cyclization reaction performed by an oxocarbenium
ion that undergoes an intramolecular pi-bond attack to construct a new carbon-carbon bond.
When this cyclization process is conjugated with Friedel-Crafts reaction, it further expands
the synthetic potential by fabricating two different carbon-carbon bonds in one single reaction.
Different acid catalysts mediated the coupled Prins-Friedel-Crafts reaction which is conducted
both in stepwise as well as in tandem fashion. In the stepwise route, three different
reacting components were utilized whereas, the tandem methodology required proper modification
of the initial substrate molecule. An array of allylic, propargylic, other related alkenols,
and carbonyl reactants were employed to carry out the cyclization process. Several oxygenated
heterocycles equipped with diverse functionalities were constructed in a stereoselective manner which again
reinforced the significance of this cyclization protocol undoubtedly. The present mini-review highlights the utilization
of different one-pot stepwise Prins-Friedel-Crafts reactions and the subsequent development of cascade Prins-
Friedel-Crafts cyclization process to furnish intricate molecular architectures of vital six-membered oxacycles.
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Affiliation(s)
- Snigdha Roy
- Department of Chemistry, Banwarilal Bhalotia College, Asansol-713303, West Bengal, India
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4
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Satteyyanaidu V, Chandrashekhar R, Reddy BVS, Lalli C. Modulating Prins Cyclization
versus
Tandem Prins Processes for the Synthesis of Hexahydro‐1
H
‐pyrano[3,4‐
c
]chromenes. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Vallabhareddy Satteyyanaidu
- Fluoro & Agrochemicals CSIR-Indian Institute of Chemical Technology Hyderabad 500 007
- Academy of Scientific and Innovative Research (AcSIR) New Delhi 110025 India
| | - Rapelli Chandrashekhar
- Fluoro & Agrochemicals CSIR-Indian Institute of Chemical Technology Hyderabad 500 007
- Academy of Scientific and Innovative Research (AcSIR) New Delhi 110025 India
| | - B. V. Subba Reddy
- Fluoro & Agrochemicals CSIR-Indian Institute of Chemical Technology Hyderabad 500 007
- Academy of Scientific and Innovative Research (AcSIR) New Delhi 110025 India
| | - Claudia Lalli
- CNRS ISCR – UMR 6226 Univ Rennes 35000 Rennes France
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5
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Sun HR, Zhao Q, Yang H, Yang S, Gou BB, Chen J, Zhou L. Chiral Phosphoric-Acid-Catalyzed Cascade Prins Cyclization. Org Lett 2019; 21:7143-7148. [PMID: 31414820 DOI: 10.1021/acs.orglett.9b02714] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Asymmetric Prins cyclization of in situ generated quinone methides and o-aminobenzaldehyde has been developed with chiral phosphoric acid as an efficient catalyst. This unconventional method provides a facile access to diverse functionalized trans-fused pyrano-/furo-tetrahydroquinoline derivatives in excellent yield and with excellent diastereo- and enantioselectivities (up to 99% yield and 99% ee). Mechanistic studies suggested that the three adjacent tertiary stereocenters were constructed through the sequential formation of C-O, C-C, and C-N bonds.
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Affiliation(s)
- Huai-Ri Sun
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China
| | - Qingyang Zhao
- School of Pharmaceutical Sciences (Shenzhen) , Sun Yat-sen University , Shenzhen 518107 , P. R. China
| | - Hui Yang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China
| | - Sen Yang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China
| | - Bo-Bo Gou
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China
| | - Jie Chen
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China
| | - Ling Zhou
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China
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6
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Sakata Y, Yasui E, Mizukami M, Nagumo S. Cascade reaction including a formal [5 + 2] cycloaddition by use of alkyne-Co2(CO)6 complex. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.01.045] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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7
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Kato M, Saito A. Domino Synthesis of 2,3-Dialkylidenetetrahydrofurans via Tandem Prins Cyclization-Skeletal Reorganization. Org Lett 2018; 20:4709-4712. [PMID: 30044103 DOI: 10.1021/acs.orglett.8b02114] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A domino synthesis of 2,3-dialkylidenetetrahydrofurans based on Prins-type cyclization of 3,5-diynols and aldehydes is described. In the present reaction, skeletal reorganization of the Prins-cyclized intermediates proceeds via a ring-opening reaction followed by intramolecular (hemi)acetalization of the resulting 4-en-1-yn-3-ones. Furthermore, a representative product undergoes a Diels-Alder reaction with dimethyl acetylenedicarboxylate (DMAD) to afford a highly substituted 2,3-dihydrobenzofuran.
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Affiliation(s)
- Mizuki Kato
- Division of Applied Chemistry, Institute of Engineering , Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho , Koganei , Tokyo 184-8588 , Japan
| | - Akio Saito
- Division of Applied Chemistry, Institute of Engineering , Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho , Koganei , Tokyo 184-8588 , Japan
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8
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Sakata Y, Yasui E, Takatori K, Suzuki Y, Mizukami M, Nagumo S. Syntheses of Polycyclic Tetrahydrofurans by Cascade Reactions Consisting of Five-Membered Ring Selective Prins Cyclization and Friedel–Crafts Cyclization. J Org Chem 2018; 83:9103-9118. [DOI: 10.1021/acs.joc.8b01195] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Yuki Sakata
- Department of Applied Chemistry, Kogakuin University, Nakano 2665-1, Hachioji, Tokyo 192-0015, Japan
| | - Eiko Yasui
- Department of Applied Chemistry, Kogakuin University, Nakano 2665-1, Hachioji, Tokyo 192-0015, Japan
| | - Kazuhiko Takatori
- Department of Synthetic Organic Chemistry, Meiji Pharmaceutical University, Noshio 2-522-1, Kiyose, Tokyo 204-8588, Japan
| | - Yuji Suzuki
- Department of Applied Chemistry, Kogakuin University, Nakano 2665-1, Hachioji, Tokyo 192-0015, Japan
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, Maeda 15-4-1, Teine, Sapporo, Hokkaido 006-8585, Japan
| | - Megumi Mizukami
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, Maeda 15-4-1, Teine, Sapporo, Hokkaido 006-8585, Japan
| | - Shinji Nagumo
- Department of Applied Chemistry, Kogakuin University, Nakano 2665-1, Hachioji, Tokyo 192-0015, Japan
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9
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Fujiya A, Yamaguchi E, Tada N, Itoh A. A Radical Reaction for the Synthesis of 3-Substituted Dihydrothiopyrans under Photosensitized Conditions. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800159] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Akitoshi Fujiya
- Graduate School of Pharmaceutical Science; Gifu Pharmaceutical University; 1-25-4, Daigaku-nishi Gifu 501-1196 Japan
| | - Eiji Yamaguchi
- Graduate School of Pharmaceutical Science; Gifu Pharmaceutical University; 1-25-4, Daigaku-nishi Gifu 501-1196 Japan
| | - Norihiro Tada
- Graduate School of Pharmaceutical Science; Gifu Pharmaceutical University; 1-25-4, Daigaku-nishi Gifu 501-1196 Japan
| | - Akichika Itoh
- Graduate School of Pharmaceutical Science; Gifu Pharmaceutical University; 1-25-4, Daigaku-nishi Gifu 501-1196 Japan
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10
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Matsumoto K, Yanagi R, Yamaguchi K, Hayashi E, Yasuda E, Nokami T, Nishiwaki K, Kashimura S, Kuriyama K. Lewis Acid Promoted Prins Cyclization Using Non-Conjugated Diene Alcohol: Sequential Reactions Terminated by Fluoride Ion. HETEROCYCLES 2018. [DOI: 10.3987/com-18-13940] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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11
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Dubbu S, Vankar YD. Diversity-Oriented Synthesis of Carbohydrate Scaffolds through the Prins Cyclization of Differently Protectedd-Mannitol-Derived Homoallylic Alcohols. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701172] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Sateesh Dubbu
- Department of Chemistry; Indian Institute of Technology Kanpur; 208016 Kanpur India
| | - Yashwant D. Vankar
- Department of Chemistry; Indian Institute of Technology Kanpur; 208016 Kanpur India
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12
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Subba Reddy BV, Nair PN, Antony A, Srivastava N. Recent Advances in Prins Spirocyclization. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700633] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- B. V. Subba Reddy
- Centre for Semio Chemicals; CSIR - Indian Institute of Chemical Technology; Hyderabad India
| | - Preethi Narayanan Nair
- Centre for Semio Chemicals; CSIR - Indian Institute of Chemical Technology; Hyderabad India
| | - Aneesh Antony
- Centre for Semio Chemicals; CSIR - Indian Institute of Chemical Technology; Hyderabad India
| | - Nikhil Srivastava
- Centre for Semio Chemicals; CSIR - Indian Institute of Chemical Technology; Hyderabad India
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13
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Hinkle RJ, Chen Y, Nofi CP, Lewis SE. Electronic effects on a one-pot aromatization cascade involving alkynyl-Prins cyclization, Friedel–Crafts alkylation and dehydration to tricyclic benzo[f]isochromenes. Org Biomol Chem 2017; 15:7584-7593. [DOI: 10.1039/c7ob01412k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A short, efficient cyclization/aromatization cascade affords tricyclic 1,4-dihydro-2H-benzo[f]isochromenes. Electronic factors suggest concerted alkynyl-Prins and Friedel–Crafts reactions in the sequence.
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Affiliation(s)
- Robert J. Hinkle
- Department of Chemistry
- The College of William & Mary
- Williamsburg
- USA
| | - Yuzhou Chen
- Department of Chemistry
- The College of William & Mary
- Williamsburg
- USA
| | - Colleen P. Nofi
- Department of Chemistry
- The College of William & Mary
- Williamsburg
- USA
| | - Shane E. Lewis
- Department of Chemistry
- The College of William & Mary
- Williamsburg
- USA
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14
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Lukin A, Bagnyukova D, Kalinchenkova N, Zhurilo N, Krasavin M. Spirocyclic amino alcohol building blocks prepared via a Prins-type cyclization in aqueous sulfuric acid. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.06.054] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Liu GQ, Cui B, Xu R, Li YM. Preparation of trans-2-Substituted-4-halopiperidines and cis-2-Substituted-4-halotetrahydropyrans via AlCl3-Catalyzed Prins Reaction. J Org Chem 2016; 81:5144-61. [PMID: 27214117 DOI: 10.1021/acs.joc.6b00725] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A general and practical method for the preparation of trans-2-substituted-4-halopiperidines and cis-2-substituted-4-halotetrahydropyrans is reported. Using 5 mol % of AlCl3 as the catalyst and 2 equiv of trimethylsilyl halides as the halide sources, aza-Prins cyclization of N-tosyl homoallylamine or Prins cyclization of homoallylic alcohol with carbonyl compounds could be readily realized, giving the corresponding trans-2-substituted-4-halopiperidines or cis-2-substituted-4-halotetrahydropyrans in high yields and satisfactory diastereoselectivity.
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Affiliation(s)
- Gong-Qing Liu
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , Tianjin 300071, People's Republic of China
| | - Bin Cui
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , Tianjin 300071, People's Republic of China
| | - Rong Xu
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , Tianjin 300071, People's Republic of China
| | - Yue-Ming Li
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , Tianjin 300071, People's Republic of China
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16
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Lin W, Cheng J, Ma S. Iron(III) Chloride-Catalyzed Tandem Aza-Prins/Friedel-Crafts Cyclization of 2-Arylethyl-2,3-butadienyl Tosylamides and Aldehydes-An Efficient Synthesis of Benzo[f]isoquinolines. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600107] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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17
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Gharpure SJ, Nanda SK. Stereoselective synthesis of thiazino[4,3-a]indoles using the thia-Pictet-Spengler reaction of indoles bearing N-tethered thiols and vinylogous thiocarbonates. Org Biomol Chem 2016; 14:5586-90. [PMID: 27011230 DOI: 10.1039/c6ob00501b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
An inter- as well as intra-molecular thia-Pictet-Spengler cyclization of N-tethered thiols and vinylogous thiocarbonates is described for the stereoselective synthesis of N-fused thiazinoindole derivatives. The strategy is extended to one-pot, sequential Friedel-Crafts alkylation - Pictet-Spengler cyclization and the synthesis of thiazino-oxepino-indole.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India.
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18
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Ponra S, Majumdar KC. Brønsted acid-promoted synthesis of common heterocycles and related bio-active and functional molecules. RSC Adv 2016. [DOI: 10.1039/c5ra27069c] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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19
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Xiu W, Zhenhua W, Zhang G, Zhang W, Wu Y, Gao Z. Tunable Titanocene Lewis Acid Catalysts for Selective Friedel-Crafts Reaction of Indoles andN-Sulfonylaldimines. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501122] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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20
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Chio FKI, Guesné SJJ, Hassall L, McGuire T, Dobbs AP. Synthesis of Azabicycles via Cascade Aza-Prins Reactions: Accessing the Indolizidine and Quinolizidine Cores. J Org Chem 2015; 80:9868-80. [DOI: 10.1021/acs.joc.5b01301] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Freda K. I. Chio
- School of Biological & Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom
| | | | | | - Thomas McGuire
- AstraZeneca, Alderley Park, Cheshire, SK10 4TG, United Kingdom
| | - Adrian P. Dobbs
- School of Biological & Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom
- Department
of Chemistry, University of Exeter, Devon EX4 4QD, United Kingdom
- School
of Science, University of Greenwich, Chatham Maritime, Kent ME4 4TB, United Kingdom
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21
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Khan FA, Budanur BM. Superoxide mediated isomerization of 4-aryl-but-1-ynes to 1-aryl-1,3-butadienes. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.07.075] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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22
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Reddy BVS, Reddy GN, Reddy MR, Lakshmi JK, Jagadeesh B, Sridhar B. Prins-Driven Friedel-Crafts Reaction for the Stereoselective Synthesis of Hexahydroindeno[2,1-c]pyran Derivatives. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500218] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- B. V. Subba Reddy
- Natural Product Chemistry; CSIR-Indian Institute of Chemical Technology, Tarnaka; Hyderabad- 500 607 India), Fax: (+91) 40-27160512
| | - G. Niranjan Reddy
- Natural Product Chemistry; CSIR-Indian Institute of Chemical Technology, Tarnaka; Hyderabad- 500 607 India), Fax: (+91) 40-27160512
| | - M. Ramana Reddy
- Natural Product Chemistry; CSIR-Indian Institute of Chemical Technology, Tarnaka; Hyderabad- 500 607 India), Fax: (+91) 40-27160512
| | - J. K. Lakshmi
- Centre for Nuclear Magnetic Resonance and Structural Chemistry; CSIR-Indian Institute of Chemical Technology, Tarnaka; Hyderabad- 500 607 India
| | - B. Jagadeesh
- Centre for Nuclear Magnetic Resonance and Structural Chemistry; CSIR-Indian Institute of Chemical Technology, Tarnaka; Hyderabad- 500 607 India
| | - B. Sridhar
- Laboratory of Crystallography; CSIR-Indian Institute of Chemical Technology, Tarnaka; Hyderabad- 500 607 India
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23
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Tsui GC, Liu L, List B. Die organokatalytische asymmetrische Prins-Cyclisierung. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201500219] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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24
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Tsui GC, Liu L, List B. The Organocatalytic Asymmetric Prins Cyclization. Angew Chem Int Ed Engl 2015; 54:7703-6. [DOI: 10.1002/anie.201500219] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 03/25/2015] [Indexed: 01/25/2023]
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25
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Shin S, Park Y, Kim CE, Son JY, Lee PH. Synthesis of 2-Alkoxyaryl-2-aryl Enamines via Tandem Copper-Catalyzed Cycloaddition and Rhodium-Catalyzed Alkoxyarylation from Alkynes, N-Sulfonyl Azides, and Aryl Ethers. J Org Chem 2015; 80:5859-69. [PMID: 25940682 DOI: 10.1021/acs.joc.5b00891] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A synthetic route to a wide range of 2-alkoxyaryl-2-aryl enamines is developed from Rh-catalyzed alkoxyarylation of N-sulfonyl-4-aryl-1,2,3-triazoles with aryl ethers via the elimination of nitrogen molecule. In addition, 2-alkoxyaryl-2-aryl enamines are prepared via tandem Cu-catalyzed cycloaddition and Rh-catalyzed alkoxyarylation starting from alkynes, N-sulfonyl azides, and aryl ethers in one-pot.
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Affiliation(s)
- Seohyun Shin
- National Creative Research Initiative Center for Catalytic Organic Reactions, Department of Chemistry, Kangwon National University, Chuncheon 200-701, Republic of Korea
| | - Youngchul Park
- National Creative Research Initiative Center for Catalytic Organic Reactions, Department of Chemistry, Kangwon National University, Chuncheon 200-701, Republic of Korea
| | - Cheol-Eui Kim
- National Creative Research Initiative Center for Catalytic Organic Reactions, Department of Chemistry, Kangwon National University, Chuncheon 200-701, Republic of Korea
| | - Jeong-Yu Son
- National Creative Research Initiative Center for Catalytic Organic Reactions, Department of Chemistry, Kangwon National University, Chuncheon 200-701, Republic of Korea
| | - Phil Ho Lee
- National Creative Research Initiative Center for Catalytic Organic Reactions, Department of Chemistry, Kangwon National University, Chuncheon 200-701, Republic of Korea
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26
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Borah M, Gogoi P, Indukuri K, Saikia AK. Diastereoselective Synthesis of Substituted Tetrahydrothiophenes and -thiopyrans via Thia-Prins Cyclization Reaction. J Org Chem 2015; 80:2641-8. [DOI: 10.1021/jo502831w] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Madhurjya Borah
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Paramartha Gogoi
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Kiran Indukuri
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Anil K. Saikia
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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27
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Subba Reddy BV, Medaboina D, Sridhar B. Stereoselective Synthesis of Hexahydro-1H-spiro[isoquinoline-4,4′-pyran] Scaffolds through an Intramolecular Prins Cascade Process. J Org Chem 2014; 80:653-60. [DOI: 10.1021/jo5023926] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- B. V. Subba Reddy
- Natural Product Chemistry and ‡Laboratory of X-ray Crystallography, Academy of Scientific and Innovative Research, Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Durgaprasad Medaboina
- Natural Product Chemistry and ‡Laboratory of X-ray Crystallography, Academy of Scientific and Innovative Research, Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - B. Sridhar
- Natural Product Chemistry and ‡Laboratory of X-ray Crystallography, Academy of Scientific and Innovative Research, Indian Institute of Chemical Technology, Hyderabad 500 007, India
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28
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Reddy BS, Reddy SG, Reddy MR, Sridhar B, Bhadra MP. Aminol initiated Prins cyclization for the synthesis of octahydro-1H-pyrano [3,4-c]pyridine and hexahydro-1H-furo[3,4-c]pyrrole derivatives. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.06.109] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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29
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Subba Reddy BV, Gopal Reddy S, Ramana Reddy M, Pal Bhadra M, Sarma AVS. Tandem Prins/pinacol reaction for the synthesis of oxaspiro[4.5]decan-1-one scaffolds. Org Biomol Chem 2014; 12:7257-60. [DOI: 10.1039/c4ob01188k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Ghosh AK, Keyes C, Veitschegger AM. FeCl 3-Catalyzed Tandem Prins and Friedel-Crafts Cyclization: A Highly Diastereoselective Route to Polycyclic Ring Structures. Tetrahedron Lett 2014; 55:4251-4254. [PMID: 25104867 DOI: 10.1016/j.tetlet.2014.05.092] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Catalytic FeCl3 in the presence of 4Å molecular sieves has been shown to effect highly diastereoselective tandem Prins and Friedel-Crafts cyclization of substituted (E/Z)-6-phenylhex-3-en-1-ol and a variety of aldehydes to provide a range of polycyclic compounds in good to excellent yields. The reaction of an enantioenriched alcohol with an aldehyde provided the cyclization product without loss of optical activity. Furthermore, a Lewis acid catalyzed ring opening resulted in functionalized tetralin derivatives with multiple chiral centers.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Chad Keyes
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Anne M Veitschegger
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
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31
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Reddy BVS, Ramana Reddy M, Sridhar B, Singarapu KK. Acetal-initiated Prins bicyclization for the synthesis of hexahydrofuro-[3,4-c]furan lignans and octahydropyrano[3,4-c]pyran derivatives. Org Biomol Chem 2014; 12:4754-62. [PMID: 24875046 DOI: 10.1039/c4ob00305e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An acetal-initiated Prins bicyclization approach has been developed for the stereoselective synthesis of hexahydrofuro[3,4-c]furan lignans. This also provides a direct way to generate a new series of octahydropyrano[3,4-c]pyran derivatives in a single-step process.
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Affiliation(s)
- B V Subba Reddy
- Natural Product Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, India.
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32
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InBr3-catalyzed stereoselective synthesis of 3,4-disubstituted hexahydro-1H-furo[3,4-c]pyran derivatives. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.05.121] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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33
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Syama Sundar C, Ramana Reddy M, Sridhar B, Kiran Kumar S, Suresh Reddy C, Reddy BS. BF3·OEt2-catalyzed synthesis of 1-(tetrahydropyran-3-yl)-1,3-dihydroisobenzofuran and trans-fused hexahydropyrano[3,2-c]chromene derivatives. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.05.083] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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34
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Wu Y, Chen C, Jia G, Zhu X, Sun H, Zhang G, Zhang W, Gao Z. Salicylato Titanocene Complexes as Cooperative Organometallic Lewis Acid and Brønsted Acid Catalysts for Three-Component Mannich Reactions. Chemistry 2014; 20:8530-5. [DOI: 10.1002/chem.201402438] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Indexed: 11/05/2022]
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35
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Lee J, Panek JS. Synthesis of isochromene-type scaffolds via single-flask Diels-Alder-[4 + 2]-annulation sequence of a silyl-substituted diene with menadione. Org Lett 2014; 16:3320-3. [PMID: 24918110 PMCID: PMC4076005 DOI: 10.1021/ol501329t] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A sequential Diels-Alder reaction/silicon-directed [4 + 2]-annulation was developed to assemble hydroisochromene-type ring systems from menadione 2. In the first step, a Diels-Alder of the 1-silyl-substituted butadiene 1 with 2 furnished an intermediate cyclic allylsilane. Subsequently, TMSOTf promoted a [4 + 2]-annulation through trapping of an oxonium, generated by condensation between an aldehyde and the TBS protected alcohol resulted in the formation of a cis-fused hydroisochromene 13.
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Affiliation(s)
- Jihoon Lee
- Department of Chemistry and Center for Chemical Methodology and Library Development, Metcalf Center for Science and Engineering, Boston University , 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
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36
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Reddy BVS, Kumar H, Reddy PS, Singarapu KK. Prins Spirocyclization for the Synthesis of Spiro[isobenzofuran-pyran] Derivatives. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402157] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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37
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Reddy BVS, Swain M, Reddy SM, Yadav JS, Sridhar B. Gold-Catalyzed 5-endo-digCyclization of 2-[(2-Aminophenyl)ethynyl]phenylamine with Ketones for the Synthesis of Spiroindolone and Indolo[3,2-c]quinolone Scaffolds. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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38
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Subba Reddy BV, Venkateswarlu A, Borkar P, Yadav JS, Sridhar B, Grée R. Tuning the Reactivity of Oxygen/Sulfur by Acidity of the Catalyst in Prins Cyclization: Oxa- versus Thia-Selectivity. J Org Chem 2014; 79:2716-22. [DOI: 10.1021/jo402832t] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
| | | | | | | | | | - René Grée
- Institut
des Sciences Chimiques de Rennes, Université de Rennes 1, CNRS UMR 6226, 35042 Rennes, France
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39
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Subba Reddy BV, Medaboina D, Sridhar B, Singarapu KK. Prins Cascade Cyclization for the Synthesis of 1,9-Dioxa-4-azaspiro[5.5]undecane Derivatives. J Org Chem 2014; 79:2289-95. [DOI: 10.1021/jo4027534] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- B. V. Subba Reddy
- Natural Product Chemistry, ‡Laboratory of X-ray Crystallography,
and §Centre for Nuclear
Magnetic Resonance, Indian Institute of Chemical Technology, Hyderabad-500 007, India
| | - Durgaprasad Medaboina
- Natural Product Chemistry, ‡Laboratory of X-ray Crystallography,
and §Centre for Nuclear
Magnetic Resonance, Indian Institute of Chemical Technology, Hyderabad-500 007, India
| | - B. Sridhar
- Natural Product Chemistry, ‡Laboratory of X-ray Crystallography,
and §Centre for Nuclear
Magnetic Resonance, Indian Institute of Chemical Technology, Hyderabad-500 007, India
| | - Kiran Kumar Singarapu
- Natural Product Chemistry, ‡Laboratory of X-ray Crystallography,
and §Centre for Nuclear
Magnetic Resonance, Indian Institute of Chemical Technology, Hyderabad-500 007, India
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40
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Lalli C, van de Weghe P. Enantioselective Prins cyclization: BINOL-derived phosphoric acid and CuCl synergistic catalysis. Chem Commun (Camb) 2014; 50:7495-8. [DOI: 10.1039/c4cc02826k] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synergistic catalysis between a chiral phosphoric acid and CuCl allows the development of the first enantioselective Prins cyclization.
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Affiliation(s)
- Claudia Lalli
- Université de Rennes 1
- UMR 6226 CNRS
- Institut des Sciences Chimiques de Rennes
- Equipe PNSCM
- UFR des Sciences Biologiques et Pharmaceutiques
| | - Pierre van de Weghe
- Université de Rennes 1
- UMR 6226 CNRS
- Institut des Sciences Chimiques de Rennes
- Equipe PNSCM
- UFR des Sciences Biologiques et Pharmaceutiques
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41
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Reddy BVS, Jalal S, Singarapu KK. InCl3-catalyzed Prins bicyclization for the synthesis of spirotetrahydropyran derivatives. RSC Adv 2014. [DOI: 10.1039/c4ra01503g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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42
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Breugst M, Grée R, Houk KN. Synergistic Effects between Lewis and Brønsted Acids: Application to the Prins Cyclization. J Org Chem 2013; 78:9892-7. [DOI: 10.1021/jo401628e] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Martin Breugst
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095-1569, United States
| | - René Grée
- Institut
des Sciences Chimiques de Rennes UMR CNRS 6226, Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - K. N. Houk
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095-1569, United States
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43
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Subba Reddy B, Medaboina D, Sridhar B, Singarapu KK. Stereoselective Synthesis of Hexahydro-1H-pyrano- and thiopyrano[3,4-c]quinoline Derivatives through a Prins Cascade Cyclization. J Org Chem 2013; 78:8161-8. [DOI: 10.1021/jo4009657] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- B.V. Subba Reddy
- Natural
Product Chemistry, ‡Laboratory of X-ray Crystallography, and §Centre for Nuclear Magnetic Resonance, CSIR−Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Durgaprasad Medaboina
- Natural
Product Chemistry, ‡Laboratory of X-ray Crystallography, and §Centre for Nuclear Magnetic Resonance, CSIR−Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - B. Sridhar
- Natural
Product Chemistry, ‡Laboratory of X-ray Crystallography, and §Centre for Nuclear Magnetic Resonance, CSIR−Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Kiran Kumar Singarapu
- Natural
Product Chemistry, ‡Laboratory of X-ray Crystallography, and §Centre for Nuclear Magnetic Resonance, CSIR−Indian Institute of Chemical Technology, Hyderabad 500 007, India
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44
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Subba Reddy BV, Venkateswarlu A, Borkar P, Yadav JS, Kanakaraju M, Kunwar AC, Sridhar B. Thia-Prins Bicyclization Approach for the Stereoselective Synthesis of Dithia- and Azathia-Bicycles. J Org Chem 2013; 78:6303-8. [DOI: 10.1021/jo400680w] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- B. V. Subba Reddy
- Natural
Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - A. Venkateswarlu
- Natural
Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Prashant Borkar
- Natural
Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - J. S. Yadav
- Natural
Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - M. Kanakaraju
- Natural
Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - A. C. Kunwar
- Natural
Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - B. Sridhar
- Natural
Product Chemistry, ‡Centre for Nuclear Magnetic Resonance, §Laboratory of X-ray Crystallography, Indian Institute of Chemical Technology, Hyderabad 500 007, India
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45
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Yokosaka T, Nemoto T, Hamada Y. A novel method for synthesizing 3-arylpyrrolidine and 4-arylpiperidine derivatives through an acid-promoted skeletal rearrangement. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.01.034] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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46
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Reddy BS, Reddy PS, Yadav J, Sridhar B. Novel protocol for the synthesis of octahydropyrano- and thiopyrano[4,3-a]carbazole derivatives via Prins/Friedel–Crafts cyclization. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2012.12.113] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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47
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Subba Reddy BV, Kumar H, Borkar P, Yadav JS, Sridhar B. The Prins Cascade Cyclization Reaction for the Synthesis of Angularly-Fused Tetrahydropyran and Piperidine Derivatives. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201387] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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48
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Taylor RRR, Batey RA. A Hetero Diels–Alder Approach to the Synthesis of Chromans (3,4-Dihydrobenzopyrans) Using Oxonium Ion Chemistry: The Oxa-Povarov Reaction. J Org Chem 2013; 78:1404-20. [DOI: 10.1021/jo302328s] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Rivka R. R. Taylor
- Davenport Research Laboratories,
Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
ON, Canada, M5S 3H6
| | - Robert A. Batey
- Davenport Research Laboratories,
Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
ON, Canada, M5S 3H6
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49
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Takayama Y, Yamada T, Tatekabe S, Nagasawa K. A tandem Friedel–Crafts based method for the construction of a tricyclic pyrroloquinoline skeleton and its application in the synthesis of ammosamide B. Chem Commun (Camb) 2013; 49:6519-21. [DOI: 10.1039/c3cc42463d] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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50
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Clarisse D, Pelotier B, Fache F. Solvent-Free, Metal-Free, Aza-Prins Cyclization: Unprecedented Access to δ-Sultams. Chemistry 2012; 19:857-60. [DOI: 10.1002/chem.201203415] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Indexed: 11/06/2022]
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