1
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Affiliation(s)
- Hui Li
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Jimmy Wu
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States
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2
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Synthesis of substituted pyridines from 1,2-nucleophilic addition products of functionalized N-acyl-2,3-dihydropyridones. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.07.045] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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3
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Zanatta N, Lobo MM, dos Santos JM, Souza LDA, de Andrade VP, Bonacorso HG, Martins MAP. Synthesis of 1-Arylethyl-2-arylethylamino-5-trifluoroacetyl-1,2,3,4-tetrahydropyridines and Related Compounds with Potential Cell Efflux Pump Inhibition. J Heterocycl Chem 2014. [DOI: 10.1002/jhet.2271] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Nilo Zanatta
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química; Universidade Federal de Santa Maria; 97.105-900 Santa Maria RS Brazil
| | - Marcio M. Lobo
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química; Universidade Federal de Santa Maria; 97.105-900 Santa Maria RS Brazil
| | - Josiane M. dos Santos
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química; Universidade Federal de Santa Maria; 97.105-900 Santa Maria RS Brazil
| | - Laura de A. Souza
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química; Universidade Federal de Santa Maria; 97.105-900 Santa Maria RS Brazil
| | - Valquiria P. de Andrade
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química; Universidade Federal de Santa Maria; 97.105-900 Santa Maria RS Brazil
| | - Helio G. Bonacorso
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química; Universidade Federal de Santa Maria; 97.105-900 Santa Maria RS Brazil
| | - Marcos A. P. Martins
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química; Universidade Federal de Santa Maria; 97.105-900 Santa Maria RS Brazil
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4
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Kim YW, Georg GI. Boron-Heck reaction of cyclic enaminones: regioselective direct arylation via oxidative palladium(II) catalysis. Org Lett 2014; 16:1574-7. [PMID: 24650204 PMCID: PMC3993847 DOI: 10.1021/ol500105d] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
An oxidative boron-Heck reaction of cyclic enaminones with arylboronic acids is reported. This protocol provides a regioselective arylation at the C6 position of cyclic enaminones. When an N-carbamylated cyclic enaminone was employed, a switch to a conjugate addition reaction occurred in the presence of acid.
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Affiliation(s)
- Yong Wook Kim
- Department of Chemistry, Department of Medicinal Chemistry, and the Institute for Therapeutic Discovery and Development, University of Minnesota , 717 Delaware Street SE, Minneapolis, Minnesota 55414, United States
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5
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Affiliation(s)
- Fabrice Dénès
- Laboratoire CEISAM UMR CNRS 6230 - UFR des Sciences et Techniques, Université de Nantes , 2 rue de la Houssinière, BP 92208 - 44322 Nantes Cedex 3, France
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6
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Saeed BA, Radhi WA, Elias RS. Synthesis of novel 2,3-dihydro-4-pyridinones from bisdemethoxycurcumin under microwave irradiation. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.08.115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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7
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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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8
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MacDonald FK, Burnell DJ. 2,3-Dihydro-4H-pyran-4-ones and 2,3-dihydro-4-pyridinones by cyclizations of alpha,beta-unsaturated 1,3-diketones. J Org Chem 2010; 74:6973-9. [PMID: 19705839 DOI: 10.1021/jo901355e] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A variety of alpha,beta-unsaturated 1,3-diketones cyclize to 2,3-dihydro-4H-pyran-4-ones in an acidic aqueous medium, with exceptions being alpha,beta-unsaturated 1,3-diketones in which the beta carbon is substituted by a phenyl group. Addition of 1-butanamine to the reaction medium results in the formation of 2,3-dihydro-4-pyridinones, which appear to arise via an initial 1,4-addition of the amine to the alpha,beta-unsaturated 1,3-diketones.
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Affiliation(s)
- Franklyn K MacDonald
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3
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9
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Zanatta N, da S. Fernandes L, Nachtigall FM, Coelho HS, Amaral SS, Flores AFC, Bonacorso HG, P. Martins MA. Highly Chemoselective Synthesis of 6-Alkoxy-1-alkyl(aryl)-3-trifluoroacetyl-1,4,5,6-tetrahydropyridines and 1-Alkyl(aryl)-6-amino-3-trifluoroacetyl-1,4,5,6-tetrahydropyridines. European J Org Chem 2009. [DOI: 10.1002/ejoc.200801119] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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10
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McCall WS, Grillo TA, Comins DL. N-acyldihydropyridones as synthetic intermediates. A stereoselective synthesis of acyclic amino alcohols containing multiple chiral centers. J Org Chem 2008; 73:9744-51. [PMID: 19007132 DOI: 10.1021/jo802029y] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Various multisubstituted piperidines containing a phenyl group at C-2 can be opened regio- and stereoselectively with cyanogen bromide. The ring-opened products contain useful cyanamide and benzylic bromide functional groups. The benzyl bromide can be cleanly reduced, or substituted with various nucleophiles via an S(N)2 process to add additional heteroatoms stereoselectively. This methodology is useful for the stereoselective synthesis of uniquely substituted alkylamine derivatives containing multiple chiral centers and various functionality. Diastereomerically pure amino alcohols containing three to five contiguous stereocenters were prepared using this strategy.
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Affiliation(s)
- W Stephen McCall
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA
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11
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Etayo P, Badorrey R, Díaz-de-Villegas MD, Gálvez JA. Stereoselective Synthesis of Chiral 2,3-Disubstituted 2,3-Dihydro-4(1H)-pyridones. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800697] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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13
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Gotchev DB, Comins DL. Synthetic studies toward (-)-FR901483 using a conjugate allylation to install the C-1 quaternary carbon. J Org Chem 2007; 71:9393-402. [PMID: 17137366 PMCID: PMC2527541 DOI: 10.1021/jo061677t] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two approaches to the aza-tricyclo dodecane skeleton of (-)-FR901483 are reported. Both routes utilized a Grignard addition to an N-acylpyridinium salt to establish the absolute stereochemistry at C-6 and a highly diastereoselective conjugate allylation reaction to form the quaternary center at C-1 of the natural product in an excellent yield. Although the desired polysubstituted piperidine intermediates were prepared regio- and stereoselectively, the construction of the C-8/C-9 bond connectivity could not be achieved. All attempts at a pinacol cyclization or an intramolecular 6-exo-tet epoxide opening were unsuccessful because of an unfavorable A(1,3) strain inherent in the molecule.
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14
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Etayo P, Badorrey R, Díaz-de-Villegas MD, Gálvez JA. Unexpected epimerization at C2in the Horner–Wadsworth–Emmons reaction of chiral 2-substituted-4-oxopiperidines. Chem Commun (Camb) 2006:3420-2. [PMID: 16896481 DOI: 10.1039/b608067g] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The observed epimerization at C2 in the Horner-Wadsworth-Emmons (HWE) reaction of chiral 2-substituted-4-oxopiperidines has been investigated and, on the basis of the experimental results, a mechanism for this unexpected process has been proposed.
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Affiliation(s)
- Pablo Etayo
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Instituto Universitario de Catálisis Homogénea, Universidad de Zaragoza-CSIC, E-50009 Zaragoza, Spain
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15
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16
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Pandey SK, Kumar P. Stereoselective syntheses of (+)-α- and (−)-β-conhydrine from L-aspartic acid. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.04.013] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Abstract
The asymmetric total synthesis of natural (+)-cannabisativine 1 was completed in 19 steps and 7% overall yield. The key synthetic intermediate 29 was prepared with a high degree of stereocontrol in 12 steps starting from chiral 1-acylpyridinium salt 10. Addition of zinc enolate 11 to pyridinium salt 10 furnished dihydropyridone 12 containing two contiguous stereocenters of the correct absolute configuration. Luche reduction of ketone 16 afforded diol 17 in high yield (96%) and excellent diastereoselectivity. The Mukaiyama-Michael reaction of pyridones 27a/b with O-silyl ketene acetal 32 gave phenyl selenyl ketones 33a/b with complete stereoselectivity. Elimination of cis-beta-hydroxyselenides 34 and 35 effected the regiocontrolled preparation of tetrahydropyridine derivative 29. Several approaches to the macrocyclic ring closure of the 13-membered ring were investigated, ultimately leading to the completion of an asymmetric synthesis of the target compound with a high degree of stereocontrol.
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Affiliation(s)
- Jeffrey T Kuethe
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA
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18
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Bahia PS, Snaith JS. Synthesis of 3-substituted 4-piperidinones via a one-pot tandem oxidation-cyclization-oxidation process: stereodivergent reduction to 3,4-disubstituted piperidines. J Org Chem 2004; 69:3226-9. [PMID: 15104472 DOI: 10.1021/jo0357418] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel approach to 3-substituted 4-piperidinones is described. The one-pot tandem oxidation-cyclization-oxidation of unsaturated alcohols 1a-e by PCC or PCC and trifluoromethanesulfonic acid affords piperidinones 2a-e in good yield. Reduction of 2a-e by L-Selectride gives the corresponding cis 3,4-disubstituted piperidines with diastereomeric ratios of >99:1. By contrast, reduction of 2a-e by Al-isopropoxydiisobutylalane gives the trans products with diastereomeric ratios of up to 99:1.
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Affiliation(s)
- Perdip S Bahia
- School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
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19
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Williams JT, Bahia PS, Snaith JS. Synthesis of 3,4-disubstituted piperidines by carbonyl ene and Prins cyclizations: a switch in diastereoselectivity between Lewis and Brønsted acid catalysts. Org Lett 2002; 4:3727-30. [PMID: 12375929 DOI: 10.1021/ol0266929] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] A novel diastereoselective approach to cis and trans 3,4-disubstituted piperidines is described. Carbonyl ene cyclization of aldehydes 6a-e catalyzed by the Lewis acid methyl aluminum dichloride in refluxing chloroform affords trans piperidines 8a-e with diastereomeric ratios of up to 93:7. By contrast, Prins cyclization of 6a-e catalyzed by hydrochloric acid at low temperatures affords cis products 7a-e with diastereomeric ratios of up to 98:2.
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Affiliation(s)
- Jodi T Williams
- School of Chemical Sciences, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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20
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Affiliation(s)
- D L Comins
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA.
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21
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Ma D, Sun H. A simple and stereospecfic route to 2,6-disubstituted 4-hydroxypiperidines. Synthesis of dendrobate alkaloid (+)-241D and formal synthesis of (-)-indolizidine 167B. Org Lett 2000; 2:2503-5. [PMID: 10956532 DOI: 10.1021/ol006176n] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The condensation of enantiopure beta-amino esters with beta-ketoesters followed by cyclization and decarboxylation afforded 2,3-dihydro-4-pyridones 3, which were selectively hydrogenated to provide 2,6-disubstituted 4-hydroxypiperdines.
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Affiliation(s)
- D Ma
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China.
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22
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Asymmetric synthesis of erythro- and threo-2-(1-hydroxyalkyl)piperidines via iodocyclocarbamation of 1-acyl-2-alkenyl-1,2,3,6-tetrahydropyridines. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)00298-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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23
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Kuethe JT, Comins DL. Addition of metallo enolates to chiral 1-acylpyridinium salts: total synthesis of (+)-cannabisativine. Org Lett 2000; 2:855-7. [PMID: 10754687 DOI: 10.1021/ol0056271] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[formula: see text] A novel route to the first asymmetric synthesis of (+)-cannabisativine (1) is described. The total synthesis of 1 was accomplished with a high degree of regio- and stereoselectivity in 19 steps and 9% overall yield.
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Affiliation(s)
- J T Kuethe
- Department of Chemistry, North Carolina State University, Raleigh 27695-8204, USA
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