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Ramachandran PV, Alawaed AA, Singh A. Titanium-Mediated Reduction of Carboxamides to Amines with Borane-Ammonia. Molecules 2023; 28:4575. [PMID: 37375131 DOI: 10.3390/molecules28124575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/02/2023] [Accepted: 06/03/2023] [Indexed: 06/29/2023] Open
Abstract
In this study, the successful titanium tetrachloride-catalyzed reduction of aldehydes, ketones, carboxylic acids, and nitriles with borane-ammonia was extended to the reduction (deoxygenation) of a variety of aromatic and aliphatic pri-, sec- and tert-carboxamides, by changing the stoichiometry of the catalyst and reductant. The corresponding amines were isolated in good to excellent yields, following a simple acid-base workup.
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Affiliation(s)
| | - Abdulkhaliq A Alawaed
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA
| | - Aman Singh
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA
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2
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Lambert KM, Cox JB, Liu L, Jackson AC, Yruegas S, Wiberg KB, Wood JL. Total Synthesis of (±)‐Phyllantidine: Development and Mechanistic Evaluation of a Ring Expansion for Installation of Embedded Nitrogen‐Oxygen Bonds. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003829] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Kyle M. Lambert
- Department of Chemistry and Biochemistry Baylor University One Bear Place 97348 Waco TX 76798 USA
| | - Joshua B. Cox
- Department of Chemistry and Biochemistry Baylor University One Bear Place 97348 Waco TX 76798 USA
| | - Lin Liu
- Department of Chemistry and Biochemistry Baylor University One Bear Place 97348 Waco TX 76798 USA
| | - Amy C. Jackson
- Department of Chemistry and Biochemistry Baylor University One Bear Place 97348 Waco TX 76798 USA
| | - Sam Yruegas
- Department of Chemistry and Biochemistry Baylor University One Bear Place 97348 Waco TX 76798 USA
| | - Kenneth B. Wiberg
- Department of Chemistry Yale University New Haven CT 06520 USA
- 865 Central Avenue Needham MA 02492 USA
| | - John L. Wood
- Department of Chemistry and Biochemistry Baylor University One Bear Place 97348 Waco TX 76798 USA
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Lambert KM, Cox JB, Liu L, Jackson AC, Yruegas S, Wiberg KB, Wood JL. Total Synthesis of (±)-Phyllantidine: Development and Mechanistic Evaluation of a Ring Expansion for Installation of Embedded Nitrogen-Oxygen Bonds. Angew Chem Int Ed Engl 2020; 59:9757-9766. [PMID: 32271982 DOI: 10.1002/anie.202003829] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 04/05/2020] [Indexed: 11/06/2022]
Abstract
The development of a concise total synthesis of (±)-phyllantidine (1), a member of the securinega family of alkaloids containing an unusual oxazabicyclo[3.3.1]nonane core, is described. The synthesis employs a unique synthetic strategy featuring the ring expansion of a substituted cyclopentanone to a cyclic hydroxamic acid as a key step that allows facile installation of the embedded nitrogen-oxygen (N-O) bond. The optimization of this sequence to effect the desired regiochemical outcome and its mechanistic underpinnings were assessed both computationally and experimentally. This synthetic approach also features an early-stage diastereoselective aldol reaction to assemble the substituted cyclopentanone, a mild reduction of an amide intermediate without N-O bond cleavage, and the rapid assembly of the butenolide found in (1) via use of the Bestmann ylide.
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Affiliation(s)
- Kyle M Lambert
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, TX, 76798, USA
| | - Joshua B Cox
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, TX, 76798, USA
| | - Lin Liu
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, TX, 76798, USA
| | - Amy C Jackson
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, TX, 76798, USA
| | - Sam Yruegas
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, TX, 76798, USA
| | - Kenneth B Wiberg
- Department of Chemistry, Yale University, New Haven, CT, 06520, USA.,865 Central Avenue, Needham, MA, 02492, USA
| | - John L Wood
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, TX, 76798, USA
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Okamoto K, Lu F, Nakanishi T. Posttreatment Technique for SN2 Alkylation of Aromatics with Alkyl Halides: Aiming toward Large-Scale Synthesis of Building Blocks for Soft π-Molecular Materials. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20180075] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ken Okamoto
- Frontier Molecules Group, International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Department of Engineering for Future Innovation, Division of Chemical Engineering and Biotechnology, National Institute of Technology, Ichinoseki College, Takanashi, Hagisho, Ichinoseki, Iwate 021-8511, Japan
| | - Fengniu Lu
- Frontier Molecules Group, International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Takashi Nakanishi
- Frontier Molecules Group, International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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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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Sun HB, Ai Y, Ren S, Li Y, Li D. Copper promoted catalytic cleavage of esters under nearly neutral conditions in the presence of NaN3. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.03.120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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