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Kal‐Koshvandi AT, Heravi MM. Applications of Dainshefsky's Dienes in the Asymmetric synthesis of Aza‐Diels‐Alder Reaction. CHEM REC 2018; 19:550-600. [DOI: 10.1002/tcr.201800066] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 08/17/2018] [Indexed: 11/11/2022]
Affiliation(s)
| | - Majid M. Heravi
- Department of ChemistryAlzahra University Vanak, Tehran Iran
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2
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Choudhary S, Pawar AP, Yadav J, Sharma DK, Kant R, Kumar I. One-Pot Synthesis of Chiral Tetracyclic Dibenzo[ b, f][1,4]oxazepine-Fused 1,2-Dihydropyridines (DHPs) under Metal-Free Conditions. J Org Chem 2018; 83:9231-9239. [PMID: 29906390 DOI: 10.1021/acs.joc.8b01232] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient protocol for the catalytic asymmetric synthesis of new dibenzo[ b, f][1,4]-oxazepine-fused 1,2-dihydropyridines (DHPs) has been described under metal-free conditions. This reaction proceeds through proline-catalyzed direct Mannich/cyclization between seven-membered dibenzo[ b, f][1,4]-oxazepine-imines and aqueous glutaraldehyde, followed by IBX-mediated site-selective dehydrogenative oxidation in one-pot operation with high yields (up to 92%) and excellent enantioselectivity (up to >99:1 er).
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Affiliation(s)
- Sachin Choudhary
- Department of Chemistry , Birla Institute of Technology & Science , Pilani 333 031 , India
| | - Amol Prakash Pawar
- Department of Chemistry , Birla Institute of Technology & Science , Pilani 333 031 , India
| | - Jyothi Yadav
- Department of Chemistry , Birla Institute of Technology & Science , Pilani 333 031 , India
| | - Devinder Kumar Sharma
- X-ray Crystallography Laboratory, Post-Graduate Department of Physics & Electronics , University of Jammu , Jammu and Kashmir 180 006 , India
| | - Rajni Kant
- X-ray Crystallography Laboratory, Post-Graduate Department of Physics & Electronics , University of Jammu , Jammu and Kashmir 180 006 , India
| | - Indresh Kumar
- Department of Chemistry , Birla Institute of Technology & Science , Pilani 333 031 , India
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3
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Yamada K, Brousseau M, Honma W, Iimura A, Imase H, Iwaki Y, Kawanami T, LaSala D, Liang G, Mitani H, Nonomura K, Ohmori O, Pan M, Rigel DF, Umemura I, Yasoshima K, Zhu G, Mogi M. Discovery of a Novel Piperidine-Based Inhibitor of Cholesteryl Ester Transfer Protein (CETP) That Retains Activity in Hypertriglyceridemic Plasma. J Med Chem 2017; 60:8466-8481. [DOI: 10.1021/acs.jmedchem.7b00900] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Ken Yamada
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts 02139-4133, United States
- Novartis Institutes for BioMedical Research, Novartis
Pharma K.K., Ohkubo 8, Tsukuba, Ibaraki 300-2611, Japan
| | - Margaret Brousseau
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts 02139-4133, United States
| | - Wataru Honma
- Novartis Institutes for BioMedical Research, Novartis
Pharma K.K., Ohkubo 8, Tsukuba, Ibaraki 300-2611, Japan
| | - Akiko Iimura
- Novartis Institutes for BioMedical Research, Novartis
Pharma K.K., Ohkubo 8, Tsukuba, Ibaraki 300-2611, Japan
| | - Hidetomo Imase
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts 02139-4133, United States
- Novartis Institutes for BioMedical Research, Novartis
Pharma K.K., Ohkubo 8, Tsukuba, Ibaraki 300-2611, Japan
| | - Yuki Iwaki
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts 02139-4133, United States
- Novartis Institutes for BioMedical Research, Novartis
Pharma K.K., Ohkubo 8, Tsukuba, Ibaraki 300-2611, Japan
| | - Toshio Kawanami
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts 02139-4133, United States
- Novartis Institutes for BioMedical Research, Novartis
Pharma K.K., Ohkubo 8, Tsukuba, Ibaraki 300-2611, Japan
| | - Daniel LaSala
- Novartis Institutes for BioMedical Research, Novartis
Pharmaceuticals Corporation, 1 Health Plaza, East Hanover, New Jersey 07936-1080, United States
| | - Guiqing Liang
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts 02139-4133, United States
| | - Hironobu Mitani
- Novartis Institutes for BioMedical Research, Novartis
Pharma K.K., Ohkubo 8, Tsukuba, Ibaraki 300-2611, Japan
| | - Kazuhiko Nonomura
- Novartis Institutes for BioMedical Research, Novartis
Pharma K.K., Ohkubo 8, Tsukuba, Ibaraki 300-2611, Japan
| | - Osamu Ohmori
- Novartis Institutes for BioMedical Research, Novartis
Pharma K.K., Ohkubo 8, Tsukuba, Ibaraki 300-2611, Japan
| | - Meihui Pan
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts 02139-4133, United States
| | - Dean F. Rigel
- Novartis Institutes for BioMedical Research, Novartis
Pharmaceuticals Corporation, 1 Health Plaza, East Hanover, New Jersey 07936-1080, United States
| | - Ichiro Umemura
- Novartis Institutes for BioMedical Research, Novartis
Pharma K.K., Ohkubo 8, Tsukuba, Ibaraki 300-2611, Japan
| | - Kayo Yasoshima
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts 02139-4133, United States
- Novartis Institutes for BioMedical Research, Novartis
Pharma K.K., Ohkubo 8, Tsukuba, Ibaraki 300-2611, Japan
| | - Guoming Zhu
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts 02139-4133, United States
| | - Muneto Mogi
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts 02139-4133, United States
- Novartis Institutes for BioMedical Research, Novartis
Pharma K.K., Ohkubo 8, Tsukuba, Ibaraki 300-2611, Japan
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4
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Visible light photoredox and Polonovski-Potier cyclizations for the synthesis of (±)-5-epi-cermizine C and (±)-epimyrtine. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.10.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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5
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Hiebel AC, Comins DL. Novel approach toward the morphine skeleton. Synthesis of 1-(5-benzyloxy-2-bromo-4-methoxybenzyl)-6-oxo-3,4,6,7,8,8a-hexahydro-1H-isoquinoline-2-carboxylic acid phenyl ester via N-acylpyridinium salt chemistry. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.04.086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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6
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Affiliation(s)
- Guangrong Zheng
- Department of Pharmaceutical Sciences, College of Pharmacy University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA
| | - Peter A Crooks
- Department of Pharmaceutical Sciences, College of Pharmacy University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA
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7
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Cobalt-catalyzed arylation and alkenylation of alpha-bromo eneformamides and enecarbamates by cross-coupling with organic bromides: Application to the synthesis of functionalized piperidines and azepanes. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.01.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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8
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Pelletier G, Constantineau-Forget L, Charette AB. Directed functionalization of 1,2-dihydropyridines: stereoselective synthesis of 2,6-disubstituted piperidines. Chem Commun (Camb) 2014; 50:6883-5. [DOI: 10.1039/c4cc02220c] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A practical and highly stereoselective approach to access 2,6-disubstituted piperidines using an amidine auxiliary is reported. These were reduced to the saturated piperidine rings with high diastereoselectivity.
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Affiliation(s)
- Guillaume Pelletier
- FRQNT Centre in Green Chemistry and Catalysis
- Faculty of Arts and Sciences
- Department of Chemistry
- Université de Montréal
- Montréal, Canada H3C 3J7
| | - Léa Constantineau-Forget
- FRQNT Centre in Green Chemistry and Catalysis
- Faculty of Arts and Sciences
- Department of Chemistry
- Université de Montréal
- Montréal, Canada H3C 3J7
| | - André B. Charette
- FRQNT Centre in Green Chemistry and Catalysis
- Faculty of Arts and Sciences
- Department of Chemistry
- Université de Montréal
- Montréal, Canada H3C 3J7
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9
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Harada S, Sakai T, Takasu K, Yamada KI, Yamamoto Y, Tomioka K. Total Synthesis of (−)-Kopsinine by an Asymmetric One-Pot [N+2+3] Cyclization. Chem Asian J 2012; 7:2196-8. [DOI: 10.1002/asia.201200575] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Indexed: 11/12/2022]
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10
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Ying Y, Kim H, Hong J. Stereoselective Synthesis of 2,6-cis- and 2,6-trans-Piperidines through Organocatalytic Aza-Michael Reactions: A Facile Synthesis of (+)-Myrtine and (−)-Epimyrtine. Org Lett 2011; 13:796-9. [PMID: 21250755 DOI: 10.1021/ol103064f] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Yongcheng Ying
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Hyoungsu Kim
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Jiyong Hong
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
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11
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Sahn JJ, Comins DL. [2 + 2] Photochemical Cycloaddition/Ring Opening of 6-Alkenyl-2,3-dihydro-4-pyridones. J Org Chem 2010; 75:6728-31. [DOI: 10.1021/jo101276q] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James J. Sahn
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
| | - Daniel L. Comins
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
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12
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Fluorinated piperidine acetic acids as gamma-secretase modulators. Bioorg Med Chem Lett 2009; 20:755-8. [PMID: 20005099 DOI: 10.1016/j.bmcl.2009.11.034] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2009] [Revised: 11/09/2009] [Accepted: 11/10/2009] [Indexed: 11/22/2022]
Abstract
We report herein a novel series of difluoropiperidine acetic acids as modulators of gamma-secretase. Synthesis of 2-aryl-3,3-difluoropiperidine analogs was facilitated by a unique and selective beta-difluorination with Selectfluor. Compounds 1f and 2c were selected for in vivo assessment and demonstrated selective lowering of Abeta42 in a genetically engineered mouse model of APP processing. Moreover, in a 7-day safety study, rats treated orally with compound 1f (250mg/kg per day, AUC(0-24)=2100microMh) did not exhibit Notch-related effects.
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13
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Wilson MS, Padwa A. A Stereoselective Approach to the Azaspiro[5.5]undecane Ring System Using a Conjugate Addition/Dipolar Cycloaddition Cascade: Application to the Total Synthesis of (±)-2,7,8-epi-Perhydrohistrionicotoxin. J Org Chem 2008; 73:9601-9. [DOI: 10.1021/jo801295e] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Albert Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
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14
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Pizzuti MG, Minnaard AJ, Feringa BL. Catalytic asymmetric synthesis of the alkaloid (+)-myrtine. Org Biomol Chem 2008; 6:3464-6. [PMID: 19082145 DOI: 10.1039/b807575a] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new protocol for the asymmetric synthesis of trans-2,6-disubstituted-4-piperidones has been developed using a catalytic enantioselective conjugate addition reaction in combination with a diastereoselective lithiation-substitution sequence; an efficient synthesis of (+)-myrtine has been achieved via this route.
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Affiliation(s)
- Maria Gabriella Pizzuti
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747, AG, Groningen, The Netherlands
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15
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Etayo P, Badorrey R, Díaz-de-Villegas MD, Gálvez JA. Efficient stereoselective synthesis of enantiopure cis- and trans-1,2,4-trisubstituted piperidines. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.10.042] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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16
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Synthesis of C2-symmetric trans-2,6-diarylpiperidinones via aryl cuprate addition: an unexpected stereochemical outcome. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.01.135] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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Sax M, Ebert K, Schepmann D, Wibbeling B, Wünsch B. Synthesis and NMDA-receptor affinity of 4-oxo-dexoxadrol derivatives. Bioorg Med Chem 2006; 14:5955-62. [PMID: 16750371 DOI: 10.1016/j.bmc.2006.05.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2006] [Revised: 05/04/2006] [Accepted: 05/15/2006] [Indexed: 11/19/2022]
Abstract
A synthesis of novel dexoxadrol analogues is described, which allows modifications of the piperidine substructure. The key step of the synthesis is a hetero Diels-Alder reaction of the imine 12 with Danishefsky's diene 6. After separation of the diastereomeric piperidones 14a and 14b, the relative configuration of the unlike configured piperidone 15b was determined by X-ray crystal structure analysis. In receptor binding studies the like configured secondary amine 15a (racemate) showed considerable affinity toward the phencyclidine binding site of the NMDA receptor (Ki=470 nM).
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Affiliation(s)
- Michael Sax
- Institut für Pharmazeutische und Medizinische Chemie, Westfälische Wilhelms-Universität Münster, Hittorfstr. 58-62, D-48149 Münster, Germany
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18
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Young DW, Comins DL. Tandem Directed Lithiations of N-Boc-1,2-dihydropyridines toward Highly Functionalized 2,3-Dihydro-4-pyridones. Org Lett 2005; 7:5661-4. [PMID: 16321016 DOI: 10.1021/ol052313a] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[chemical reaction: see text]. Sequential tandem directed lithiations of an N-Boc-4-methoxy-1,2-dihydropyridine have been achieved, leading to C-5,C-6 disubstituted dihydropyridones on acidic workup. The chlorine atom of the dihydropyridone products can in turn be substituted giving rise to diverse substituents at C-6.
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Affiliation(s)
- Damian W Young
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA
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19
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An efficient route to 6-(het)aryl-2-methyl-2,3-dihydro-1H-pyridin-4-ones as potential nAChRs ligands. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.03.085] [Citation(s) in RCA: 10] [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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20
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Davis FA, Rao A, Carroll PJ. Asymmetric Synthesis of Functionalized trans-2,6-Disubstituted Piperidines with N-Sulfinyl δ-Amino β-Ketoesters. Synthesis of (−)-Lasubine I. Org Lett 2003; 5:3855-7. [PMID: 14535727 DOI: 10.1021/ol035390j] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] The hydroxy-directed reduction of 1,2-dehydropiperidines with the "ate" complex of DIBAL-H and n-BuLi affords functionalized trans-2,6-disubstituted piperidines. This methodology was employed in the asymmetric synthesis of the quinolizidine alkaloid (-)-lasubine I.
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Affiliation(s)
- Franklin A Davis
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, USA.
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21
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Shashidhar Kumar A, Haritha B, Venkateswara Rao B. A versatile and efficient synthesis of (2S)-2-(hydroxymethyl)-N-Boc-2,3-dihydro-4-pyridone. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)00888-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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Michael JP. Simple indolizidine and quinolizidine alkaloids. THE ALKALOIDS. CHEMISTRY AND BIOLOGY 2002; 55:91-258. [PMID: 11704985 DOI: 10.1016/s0099-9598(01)55004-x] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Affiliation(s)
- J P Michael
- Centre for Molecular Design, Department of Chemistry, University of the Witwatersrand, Wits 2050, South Africa
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25
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Comins DL, Zhang YM, Joseph SP. Enantiopure N-acyldihydropyridones as synthetic intermediates: asymmetric synthesis of benzomorphans. Org Lett 1999; 1:657-9. [PMID: 10823197 DOI: 10.1021/ol990738p] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[formula: see text] Concise asymmetric syntheses of several benzomorphan derivatives have been accomplished using enantiopure 2,3-dihydro-4-pyridones as chiral building blocks.
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Affiliation(s)
- D L Comins
- Department of Chemistry, North Carolina State University, Raleigh 27695-8204, USA.
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26
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Comins DL, Libby AH, Al-awar RS, Foti CJ. Asymmetric Synthesis of the Lycopodium Alkaloid, Na-Acetyl-Nb-methylphlegmarine. J Org Chem 1999. [DOI: 10.1021/jo990192k] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Daniel L. Comins
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
| | - Adam H. Libby
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
| | - Rima S. Al-awar
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
| | - Christopher J. Foti
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
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27
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Gardette D, Gelas-Mialhe Y, Gramain JC, Perrin B, Remuson R. Enantioselective synthesis of the quinolizidine alkaloids (+)-myrtine and (−)-epimyrtine. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0957-4166(98)00170-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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28
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Ramesh NG, Klunder AJ, Zwanenburg B. Enantioselective synthesis of 4-aminocyclopent-2-ene-1-one from tricyclo[5.2.1.02,6]decenyl enaminones. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(97)10820-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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29
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Alkaloid synthesis using 1-acylpyridinium salts as intermediates. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/s1521-4478(06)80008-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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30
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31
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Comins DL, LaMunyon DH. Grignard addition to 1-acyl salts of chiral 4-alkoxypyridines. A new enantioselective preparation of 2-alkyl-2,3-dihydro-4-pyridones. Tetrahedron Lett 1994. [DOI: 10.1016/0040-4039(94)85309-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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32
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Heterocycles as Vehicles for Synthesis. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/s0959-6380(13)70007-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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33
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Boche G, Marsch M, Harbach J, Harms K, Ledig B, Schubert F, Lohrenz JCW, Ahlbrecht H. [α-(Dimethylamino)benzyllithium–Diethyl Ether]2, (S)-α-(Methylpivaloylamino)benzyllithium – (–)-Sparteine, and [3-Iodo-2-lithio-1-methylindole – 2 Tetrahydrofuran]2: Crystal Structure Investigations of α-Lithiated Amines. ACTA ACUST UNITED AC 1993. [DOI: 10.1002/cber.19931260820] [Citation(s) in RCA: 79] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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34
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Pilli R, Dias L, Maldaner A. Tandem N-acyliminium-Michael addition reaction. An efficient total Synthesis of the quinolizidine alkaloids (+/−)-myrtine and (+/−)-lasubine II. Tetrahedron Lett 1993. [DOI: 10.1016/s0040-4039(00)73547-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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35
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Waldmann H, Braun A, Weymann M, Gewehr M. Asymmetric synthesis of indolo[2,3-a]quinolizidin-2-ones - congeners to yohimbine-type alkaloids. Tetrahedron 1993. [DOI: 10.1016/s0040-4020(01)80309-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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36
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Rewcastle GW, Katritzky AR. Generation and Reactions of sp2-Carbanionic Centers in the Vicinity of Heterocyclic Nitrogen Atoms. ADVANCES IN HETEROCYCLIC CHEMISTRY VOLUME 56 1993. [DOI: 10.1016/s0065-2725(08)60195-6] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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37
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Al-awar RS, Joseph SP, Comins DL. Conversion of N-Acyl-2,3-dihydro-4-pyridones to 4-chloro-1,2-dihydropyridines using the Vilsmeier reagent. Tetrahedron Lett 1992. [DOI: 10.1016/0040-4039(93)88003-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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38
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