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Wang HY, Huang K, De Jesús M, Espinosa S, Piñero-Santiago LE, Barnes CL, Ortiz-Marciales M. Synthesis of enantiopure 1,2-azido and 1,2-amino alcohols via regio- and stereoselective ring-opening of enantiopure epoxides by sodium azide in hot water. TETRAHEDRON, ASYMMETRY 2016; 27:91-100. [PMID: 26843787 PMCID: PMC4733893 DOI: 10.1016/j.tetasy.2015.12.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A practical and convenient method for the efficient and regio- and stereoselective ring-opening of enantiopure monosubstituted epoxides by sodium azide under hydrolytic conditions is reported. The ring-opening of enantiopure styryl and pyridyl (S)-epoxides by N3- in hot water takes place preferentially at the internal position with complete inversion of configuration to produce (R)-2-azido ethanols with up to 99% enantio- and regioselectivity, while the (S)-adamantyl oxirane provides mainly the (S)-1-adamantyl-2-azido ethanol in excellent yield. In general, 1,2-amino ethanols were obtained in high yield and excellent enantiopurity by the reduction of the chiral 1,2-azido ethanols with PPh3 in water/THF, and then converted into the Boc or acetamide derivatives.
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Affiliation(s)
- Hai-Yang Wang
- Department of Chemistry, University of Puerto Rico-Humacao, CALL BOX 860, Humacao, PR 00792, USA
| | - Kun Huang
- Department of Chemistry, University of Puerto Rico-Humacao, CALL BOX 860, Humacao, PR 00792, USA
| | - Melvin De Jesús
- Department of Chemistry, University of Puerto Rico-Humacao, CALL BOX 860, Humacao, PR 00792, USA
| | - Sandraliz Espinosa
- Department of Chemistry, University of Puerto Rico-Humacao, CALL BOX 860, Humacao, PR 00792, USA
| | - Luis E. Piñero-Santiago
- Department of Chemistry, University of Puerto Rico-Humacao, CALL BOX 860, Humacao, PR 00792, USA
| | - Charles L. Barnes
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA
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Chiral terpene auxiliaries III: spiroborate esters from (1R,2S,3R,5R)-3-amino-apopinan-2-ol as highly effective catalysts for asymmetric reduction of ketones with borane. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2015.10.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Rowan AS, Moody TS, Howard RM, Underwood TJ, Miskelly IR, He Y, Wang B. Preparative access to medicinal chemistry related chiral alcohols using carbonyl reductase technology. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2013.09.015] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Stepanenko V, de Jesús M, Garcia C, Barnes CL, Ortiz-Marciales M. Synthesis and stability of new spiroaminoborate esters. Tetrahedron Lett 2012; 53:910-913. [PMID: 22267879 PMCID: PMC3261760 DOI: 10.1016/j.tetlet.2011.12.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
New spiroaminoborate esters derived from 1,1-diphenylprolinol, ephedrine and dihydroquinine with different alkoxy substituents were prepared as stable crystalline compounds and characterized by spectroscopical analysis and specific rotation. The structure of the spiroborate 4 derived from 1,1-diphenylprolinol and dicyclohexyl-1,1'-diol was confirmed by X-ray analysis.
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Affiliation(s)
- Viatcheslav Stepanenko
- Department of Chemistry, University of Puerto Rico – Humacao, Call Box 860, Humacao, Puerto Rico 00792, USA
| | - Melvin de Jesús
- Department of Chemistry, University of Puerto Rico – Humacao, Call Box 860, Humacao, Puerto Rico 00792, USA
| | - Carmelo Garcia
- Department of Chemistry, University of Puerto Rico – Humacao, Call Box 860, Humacao, Puerto Rico 00792, USA
| | - Charles L. Barnes
- Department of Chemistry, University of Missouri – Columbia, 125 Chemistry Building, Columbia, MO 65211, USA
| | - Margarita Ortiz-Marciales
- Department of Chemistry, University of Puerto Rico – Humacao, Call Box 860, Humacao, Puerto Rico 00792, USA
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Chiral terpene auxiliaries II. Spiroborate esters derived from α-pinene—new catalysts for asymmetric borane reduction of prochiral ketones. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.05.095] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Huang K, Wang H, Stepanenko V, De Jesús M, Torruellas C, Correa W, Ortiz-Marciales M. Chiral epoxides via borane reduction of 2-haloketones catalyzed by spiroborate ester: application to the synthesis of optically pure 1,2-hydroxy ethers and 1,2-azido alcohols. J Org Chem 2011; 76:1883-6. [PMID: 21294519 PMCID: PMC3055923 DOI: 10.1021/jo102294j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
An enantioselective borane-mediated reduction of a variety of 2-haloketones with 10% spiroaminoborate ester 1 as catalyst is described. By a simple basic workup of 2-halohydrins, optically active epoxides are obtained in high yield and with excellent enantiopurity (up to 99% ee). Ring-opening of oxiranes with phenoxides or sodium azide is investigated under different reaction conditions affording nonracemic 1,2-hydroxy ethers and 1,2-azido alcohols with excellent enantioselectivity (99% ee) and in good to high chemical yield.
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Affiliation(s)
- Kun Huang
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Haiyang Wang
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Viatcheslav Stepanenko
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Melvin De Jesús
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Carilyn Torruellas
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Wildeliz Correa
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
| | - Margarita Ortiz-Marciales
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
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Stepanenko V, De Jesús M, Correa W, Bermúdez L, Vázquez C, Guzmán I, Ortiz-Marciales M. Chiral spiroaminoborate ester as a highly enantioselective and efficient catalyst for the borane reduction of furyl, thiophene, chroman and thiochroman containing ketones. ACTA ACUST UNITED AC 2009; 20:2659-2665. [PMID: 20161579 DOI: 10.1016/j.tetasy.2009.11.009] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Prochiral heteroaryl ketones containing furan, thiophene, chroman and thiochroman moieties were successfully reduced in the presence of 1 - 10 mol % of spiroaminoborate ester 1 with different borane sources to afford non-racemic alcohols in up to 99% ee. In addition, modest enantioselectivity, around 80% ee, was achieved in the reduction of linear α,β-unsaturated heteroaryl ketones.
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Affiliation(s)
- Viatcheslav Stepanenko
- Department of Chemistry, University of Puerto Rico-Humacao, CUH Station Humacao, Puerto Rico 00791, USA
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