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Shada ADR, Mangunuru HPR, Terrab L, Tenneti S, Kalikinidi NR, Naini SR, Gajula P, Crull EB, Janganati V, Kovvuri R, Natarajan V, Lee D, Yin J, Samankumara L, Mahar R, Zhang X, Chen A, Hewa-Rahinduwage CC, Wang Z, Mamunooru M, Rana J, Wannere CS, Armstrong JD, Williamson RT, Sirasani G, Qu B, Senanayake CH. Design and Discovery of Water-Soluble Benzooxaphosphole-Based Ligands for Hindered Suzuki-Miyaura Coupling Reactions with Low Catalyst Load. Org Lett 2024; 26:2751-2757. [PMID: 37486800 DOI: 10.1021/acs.orglett.3c01663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
Abstract
We report a new class of highly effective, benzooxaphosphole-based, water-soluble ligands in the application of Suzuki-Miyaura cross-coupling reactions for sterically hindered substrates in aqueous media. The catalytic activities of the coupling reactions were greatly enhanced by the addition of catalytic amounts of organic phase transfer reagents, such as tetraglyme and tetrabutylammonium bromide. The optimized general protocol can be conducted with a low catalyst load, thereby providing a practical solution for these reactions. The viability of this new Suzuki-Miyaura protocol was demonstrated with various substrates to generate important building blocks, including heterocycles, for the synthesis of biologically active compounds.
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Affiliation(s)
- Arun D R Shada
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Hari P R Mangunuru
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Leila Terrab
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Srinivasarao Tenneti
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | | | - Santhosh Reddy Naini
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Praveen Gajula
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Emily B Crull
- University of North Carolina Wilmington, 5600 Marvin K. Moss Lane, Wilmington, North Carolina 28409, United States
| | - Venumadhav Janganati
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Raghavendra Kovvuri
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Vasudevan Natarajan
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Daniel Lee
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Jinya Yin
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Lalith Samankumara
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Rohit Mahar
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Xueyi Zhang
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Anji Chen
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | | | - Zhirui Wang
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Manasa Mamunooru
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Jagruti Rana
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Chaitanya S Wannere
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Joseph D Armstrong
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - R Thomas Williamson
- University of North Carolina Wilmington, 5600 Marvin K. Moss Lane, Wilmington, North Carolina 28409, United States
| | - Gopal Sirasani
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Bo Qu
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
| | - Chris H Senanayake
- TCG GreenChem, Inc., 701 Charles Ewing Blvd, Ewing, New Jersey 08628, United States
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Crull EB, Buevich AV, Martin GE, Mahar R, Qu B, Senanayake CH, Molinski TF, Williamson RT. DFT investigation of coupling constant anomalies in substituted β-lactams. Magn Reson Chem 2024. [PMID: 38511664 DOI: 10.1002/mrc.5444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 02/06/2024] [Accepted: 03/04/2024] [Indexed: 03/22/2024]
Abstract
β-lactams are a chemically diverse group of molecules with a wide range of biological activities. Having recently observed curious trends in 2JHH coupling values in studies on this structural class, we sought to obtain a more comprehensive understanding of these diagnostic NMR parameters, specifically interrogating 1JCH, 2JCH, and 2JHH, to differentiate 3- and 4-monosubstituted β-lactams. Further investigation using computational chemistry methods was employed to explore the geometric and electronic origins for the observed and calculated differences between the two substitution patterns.
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Affiliation(s)
- Emily B Crull
- Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, North Carolina, USA
| | - Alexei V Buevich
- Analytical Research and Development, Merck & Co, Inc, Rahway, New Jersey, USA
| | - Gary E Martin
- Department of Chemistry and Biochemistry, Seton Hall University, West Orange, New Jersey, USA
| | - Rohit Mahar
- TCG GreenChem, Inc, Ewing, New Jersey, USA
- Current address: Department of Chemistry, Hemvati Nandan Garhwal University, (A Central University), Srinagar, Uttarakhand, India
| | - Bo Qu
- TCG GreenChem, Inc, Ewing, New Jersey, USA
| | | | - Tadeusz F Molinski
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California, USA
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, USA
| | - R Thomas Williamson
- Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, North Carolina, USA
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Crull EB, Jain AN, Hawkins PCD, Cleves AE, Graziani EI, Williamson RT. Unmasking the True Identity of Rapamycin's Minor Conformer. J Nat Prod 2023. [PMID: 37432113 PMCID: PMC10391620 DOI: 10.1021/acs.jnatprod.3c00421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 07/12/2023]
Abstract
Rapamycin, a well-known macrocyclic natural product with myriad biological activities, has been the subject of intense study since its first isolation and characterization over five decades ago. Rapamycin has been found to adopt a single conformation in the solid state (both when protein bound and uncomplexed) and exists as a mixture of two conformations in solution. Early work established that the major conformer in solution is the trans amide isomer but left the minor conformer mostly uncharacterized. Since that time, it has been widely accepted that the minor conformer of rapamycin is the cis amide, based solely on analogy to FK-506, another potent immunosuppressive compound with some shared key structural elements. To address this long-standing and unresolved question, the solution structure of the minor conformer of rapamycin was investigated using a combination of NMR techniques and computational methods and determined to be a trans amide species with rotation about the ester linkage.
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Affiliation(s)
- Emily B Crull
- Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, North Carolina 28409, United States
| | - Ajay N Jain
- BioPharmics LLC, Santa Rosa, California 95404, United States
| | - Paul C D Hawkins
- Apertor Pharmaceuticals, Inc., South San Francisco, California 94080, United States
| | - Ann E Cleves
- BioPharmics LLC, Santa Rosa, California 95404, United States
| | - Edmund I Graziani
- Apertor Pharmaceuticals, Inc., 1640 S. Loop Rd. Suite 200, Alameda, California 94502, United States
| | - R Thomas Williamson
- Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, North Carolina 28409, United States
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Jentsch NG, Hume JD, Crull EB, Beauti SM, Pham AH, Pigza JA, Kessl JJ, Donahue MG. Quinolines from the cyclocondensation of isatoic anhydride with ethyl acetoacetate: preparation of ethyl 4-hydroxy-2-methylquinoline-3-carboxylate and derivatives. Beilstein J Org Chem 2018; 14:2529-2536. [PMID: 30344776 PMCID: PMC6178280 DOI: 10.3762/bjoc.14.229] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 09/04/2018] [Indexed: 01/25/2023] Open
Abstract
A convenient two-step synthesis of ethyl 4-hydroxy-2-methylquinoline-3-carboxylate derivatives has been developed starting from commercially available 2-aminobenzoic acids. In step 1, the anthranilic acids are smoothly converted to isatoic anhydrides using solid triphosgene in THF. In step 2, the anhydride electrophiles are reacted with the sodium enolate of ethyl acetoacetate, generated from sodium hydroxide, in warm N,N-dimethylacetamide resulting in the formation of substituted quinolines. A degradation-build-up strategy of the ethyl ester at the 3-position allowed for the construction of the α-hydroxyacetic acid residue required for the synthesis of key arylquinolines involved in an HIV integrase project.
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Affiliation(s)
- Nicholas G Jentsch
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Jared D Hume
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Emily B Crull
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Samer M Beauti
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Amy H Pham
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Julie A Pigza
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Jacques J Kessl
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Matthew G Donahue
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
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