1
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Patil AR, Marelli UK. Integrating 3,4-Dihydro-2 H-1,4-oxazine into Peptides as a Modification: Silver Triflate-Catalyzed Cyclization of N-Propargyl N-Sulfonyl Amino Alcohols for SPPS Applications. Org Lett 2024. [PMID: 39225658 DOI: 10.1021/acs.orglett.4c02654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/04/2024]
Abstract
We present a methodology yielding 3,4-dihydro-2H-1,4-oxazine by cyclization of N-propargyl N-sulfonyl amino alcohols using silver triflate as a catalyst at ambient temperature. Additionally, we showcase the applicability of this methodology in solid phase peptide synthesis (SPPS) to introduce the oxazine heterocyclic ring into short peptides containing serine and threonine. Notably, Rink amide resin supported the on-resin formation of 3,4-dihydro-2H-1,4-oxazine, while 2-CTC resin facilitated the oxazine formation in a one-pot process involving peptide cleavage, deprotection, and subsequent C-O ring formation, thus offering a versatile method for the late-stage modification of peptides.
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Affiliation(s)
- Abhijit Ramchandra Patil
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune-411008, India
- Central NMR Facility, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-HRDC Campus, Sector 19, Kamla Nehru Nagar, Ghaziabad, UP 201002, India
| | - Udaya Kiran Marelli
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune-411008, India
- Central NMR Facility, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-HRDC Campus, Sector 19, Kamla Nehru Nagar, Ghaziabad, UP 201002, India
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2
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Martínez de Sarasa Buchaca M, Gaona MA, Sánchez-Barba LF, Garcés A, Rodríguez AM, Rodríguez-Diéguez A, de la Cruz-Martínez F, Castro-Osma JA, Lara-Sánchez A. Zinc-Catalyzed Cyclization of Alkynyl Derivatives: Substrate Scope and Mechanistic Insights. Inorg Chem 2024; 63:13875-13885. [PMID: 39011646 PMCID: PMC11289758 DOI: 10.1021/acs.inorgchem.4c00832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 07/04/2024] [Accepted: 07/05/2024] [Indexed: 07/17/2024]
Abstract
Novel alkyl zinc complexes supported by acetamidate/thioacetamidate heteroscorpionate ligands have been successfully synthesized and characterized. These complexes exhibited different coordination modes depending on the electronic and steric effects of the acetamidate/thioacetamidate moiety. Their catalytic activity has been tested toward the hydroelementation reactions of alkynyl alcohol/acid substrates, affording the corresponding enol ether/unsaturated lactone products under mild reaction conditions. Kinetic studies have been performed and confirmed that reactions are first-order in [catalyst] and zero-order in [alkynyl substrate]. DFT calculations supported a reaction mechanism through the formation of the catalytically active species, an alkoxide-zinc intermediate, by a protonolysis reaction of the Zn-alkyl bond with the alcohol group of the substrate. Based on the experimental and theoretical results, a catalytic cycle has been proposed.
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Affiliation(s)
- Marc Martínez de Sarasa Buchaca
- Universidad
de Castilla-La Mancha, Departamento de Química Inorgánica,
Orgánica y Bioquímica-Centro de Innovación en
Química Avanzada (ORFEO−CINQA), Facultad de Ciencias
y Tecnologías Químicas, Instituto
Regional de Investigación Científica Aplicada-IRICA, Ciudad Real 13071, Spain
| | - Miguel A. Gaona
- Universidad
de Castilla-La Mancha, Departamento de Química Inorgánica,
Orgánica y Bioquímica-Centro de Innovación en
Química Avanzada (ORFEO−CINQA), Facultad de Ciencias
y Tecnologías Químicas, Instituto
Regional de Investigación Científica Aplicada-IRICA, Ciudad Real 13071, Spain
| | - Luis F. Sánchez-Barba
- Departamento
de Biología y Geología, Física y Química
Inorgánica, Universidad Rey Juan
Carlos, Móstoles 28933, Spain
| | - Andrés Garcés
- Departamento
de Biología y Geología, Física y Química
Inorgánica, Universidad Rey Juan
Carlos, Móstoles 28933, Spain
| | - Ana M. Rodríguez
- Universidad
de Castilla-La Mancha, Departamento de Química Inorgánica,
Orgánica y Bioquímica-Centro de Innovación en
Química Avanzada (ORFEO−CINQA), Facultad de Ciencias
y Tecnologías Químicas, Instituto
Regional de Investigación Científica Aplicada-IRICA, Ciudad Real 13071, Spain
| | - Antonio Rodríguez-Diéguez
- Departamento
de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Granada 18071, Spain
| | - Felipe de la Cruz-Martínez
- Departamento
de Química Inorgánica, Orgánica y Bioquímica-Centro
de Innovación en Química Avanzada (ORFEO−CINQA),
Facultad de Farmacia, Universidad de Castilla-La
Mancha, Albacete 02071, Spain
| | - José A. Castro-Osma
- Departamento
de Química Inorgánica, Orgánica y Bioquímica-Centro
de Innovación en Química Avanzada (ORFEO−CINQA),
Facultad de Farmacia, Universidad de Castilla-La
Mancha, Albacete 02071, Spain
| | - Agustín Lara-Sánchez
- Universidad
de Castilla-La Mancha, Departamento de Química Inorgánica,
Orgánica y Bioquímica-Centro de Innovación en
Química Avanzada (ORFEO−CINQA), Facultad de Ciencias
y Tecnologías Químicas, Instituto
Regional de Investigación Científica Aplicada-IRICA, Ciudad Real 13071, Spain
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3
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Gharpure SJ, Kalita D, Somani S, Pal J. Deciphering substitution effects on reductive hydroalkoxylation of alkynyl aminols for stereoselective synthesis of morpholines and 1,4-oxazepanes: total synthesis of tridemorph and fenpropimorph. Org Biomol Chem 2024; 22:5529-5533. [PMID: 38904968 DOI: 10.1039/d4ob00855c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/22/2024]
Abstract
Acid catalysed reductive etherification of N-propargyl amino alcohols for the stereoselective synthesis of cis-2,5/2,6-disubstituted morpholines and cis-2,6/2,7-disubstituted oxazepanes has been developed. Mechanistic studies revealed that terminal alkynols gave morpholines via a 6-exo-dig hydroalkoxylation-isomerization-reduction cascade. Interestingly, an alkyne hydration-cyclization-reduction sequence is found to be involved in the formation of oxazepanes from alkyl substituted internal alkynols. The strategy was used as a key step in the total synthesis of fungicides tridemorph and fenpropimorph.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India.
| | - Deepika Kalita
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India.
| | - Shipra Somani
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India.
| | - Juhi Pal
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India.
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4
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Denner TC, Heise NV, Al-Harrasi A, Csuk R. Synthesis and Enzymatic Evaluation of a Small Library of Substituted Phenylsulfonamido-Alkyl Sulfamates towards Carbonic Anhydrase II. Molecules 2024; 29:3015. [PMID: 38998967 PMCID: PMC11243685 DOI: 10.3390/molecules29133015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Revised: 06/19/2024] [Accepted: 06/20/2024] [Indexed: 07/14/2024] Open
Abstract
A small library of 79 substituted phenylsulfonamidoalkyl sulfamates, 1b-79b, was synthesized starting from arylsulfonyl chlorides and amino alcohols with different numbers of methylene groups between the hydroxyl and amino moieties yielding intermediates 1a-79a, followed by the reaction of the latter with sulfamoyl chloride. All compounds were screened for their inhibitory activity on bovine carbonic anhydrase II. Compounds 1a-79a showed no inhibition of the enzyme, in contrast to sulfamates 1b-79b. Thus, the inhibitory potential of compounds 1b-79b towards this enzyme depends on the substituent and the substitution pattern of the phenyl group as well as the length of the spacer. Bulkier substituents in the para position proved to be better for inhibiting CAII than compounds with the same substituent in the meta or ortho position. For many substitution patterns, compounds with shorter spacer lengths were superior to those with long chain spacers. Compounds with shorter spacer lengths performed better than those with longer chain spacers for a variety of substitution patterns. The most active compound held inhibition constant as low as Ki = 0.67 μM (for 49b) and a tert-butyl substituent in para position and acted as a competitive inhibitor of the enzyme.
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Affiliation(s)
- Toni C. Denner
- Organic Chemistry, Martin-Luther University Halle-Wittenberg, Kurt-Mothes, Str. 2, D-06120 Halle (Saale), Germany (N.V.H.)
| | - Niels V. Heise
- Organic Chemistry, Martin-Luther University Halle-Wittenberg, Kurt-Mothes, Str. 2, D-06120 Halle (Saale), Germany (N.V.H.)
| | - Ahmed Al-Harrasi
- Natural & Medical Sciences Research Center, University of Nizwa, Nizwa 616, Oman;
| | - René Csuk
- Organic Chemistry, Martin-Luther University Halle-Wittenberg, Kurt-Mothes, Str. 2, D-06120 Halle (Saale), Germany (N.V.H.)
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5
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Kőnig B, Sztanó G, Holczbauer T, Soós T. Syntheses of 2- and 3-Substituted Morpholine Congeners via Ring Opening of 2-Tosyl-1,2-Oxazetidine. J Org Chem 2023; 88:6182-6191. [PMID: 37125664 PMCID: PMC10167689 DOI: 10.1021/acs.joc.3c00207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Diastereoselective and diastereoconvergent syntheses of 2- and 3-substituted morpholine congeners are reported. Starting from tosyl-oxazatedine 1 and α-formyl carboxylates 2, base catalysis is utilized to yield morpholine hemiaminals. Their further synthetic elaborations allowed the concise constructions of conformationally rigid morpholines. The observed diastereoselectivities and the unusual diastereoconvergence in the photoredox radical processes seem to be the direct consequence of the avoidance of pseudo A1,3 strain between the C-3 substituent and the N-tosyl group and the anomeric effect of oxygen atoms.
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Affiliation(s)
- Bálint Kőnig
- Institute of Organic Chemistry, Research Centre for Natural Sciences, 2 Magyar tudósok körútja, H-1117 Budapest, Hungary
- Hevesy György PhD School of Chemistry, Eötvös Loránd University, 1/A Pázmány Péter sétány, H-1117 Budapest, Hungary
| | - Gábor Sztanó
- Institute of Organic Chemistry, Research Centre for Natural Sciences, 2 Magyar tudósok körútja, H-1117 Budapest, Hungary
- Hevesy György PhD School of Chemistry, Eötvös Loránd University, 1/A Pázmány Péter sétány, H-1117 Budapest, Hungary
| | - Tamás Holczbauer
- Institute of Organic Chemistry, Research Centre for Natural Sciences, 2 Magyar tudósok körútja, H-1117 Budapest, Hungary
- Centre for Structural Science, Research Centre for Natural Sciences, 2 Magyar tudósok körútja, H-1117 Budapest, Hungary
| | - Tibor Soós
- Institute of Organic Chemistry, Research Centre for Natural Sciences, 2 Magyar tudósok körútja, H-1117 Budapest, Hungary
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6
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Singh B, Kumar M, Goswami G, Verma I, Ghorai MK. Ring-Opening Cyclization (ROC) of Aziridines with Propargyl Alcohols: Synthesis of 3,4-Dihydro-2 H-1,4-oxazines. J Org Chem 2023; 88:4504-4518. [PMID: 36972376 DOI: 10.1021/acs.joc.2c03093] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
Activated aziridines react with propargyl alcohols in the presence of Zn(OTf)2 as the Lewis acid catalyst following an SN2-type ring-opening mechanism to furnish the corresponding amino ether derivatives. Those amino ethers further undergo intramolecular hydroamination via 6-exo-dig cyclization in the presence of Zn(OTf)2 as the catalyst and tetrabutylammonium triflate salt as an additive under one-pot two-step reaction conditions. However, for nonracemic examples, ring-opening and cyclization steps were conducted under two-pot conditions. The reaction works well without any additional solvents. The final 3,4-dihydro-2H-1,4-oxazine products were obtained with 13 to 84% yield and 78 to 98% enantiomeric excess (for nonracemic examples).
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Affiliation(s)
- Bharat Singh
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Manish Kumar
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Gaurav Goswami
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Indresh Verma
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Manas K Ghorai
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
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7
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Duchamp E, Devin R, Aguiar PM, Gaucherand A, Hanessian S. Polygonapholine: A Total Synthesis Questions the Identity for the Purported Structure of the Natural Product. J Org Chem 2022; 87:15713-15718. [PMID: 36349937 DOI: 10.1021/acs.joc.2c02339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Polygonapholine was isolated in 1997 from the Polygonatum alte-lobatum rhizome. Based on spectroscopic data, it was assigned a structure comprising an unusual cis-2,6-disubstituted bis-aryl morpholine ring to which is attached a (Z)-4-hydroxycinnamate as an amide and an (E)-4-hydroxycinnamate as an ester. Being a meso compound, polygonapholine should not exhibit an optical rotation as reported. A total synthesis of the purported morpholine alkaloid presented herein reveals discrepancies between the synthetic and the natural product casting doubt on the originally proposed structure.
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Affiliation(s)
- Edouard Duchamp
- Department of Chemistry, Université de Montréal, P.O. Box 6128, Succ., Centre-ville, Montréal, Québec, Canada, H3C 3J7
| | - Rory Devin
- Department of Chemistry, Université de Montréal, P.O. Box 6128, Succ., Centre-ville, Montréal, Québec, Canada, H3C 3J7
| | - Pedro M Aguiar
- Department of Chemistry, Université de Montréal, P.O. Box 6128, Succ., Centre-ville, Montréal, Québec, Canada, H3C 3J7
| | - Arthur Gaucherand
- Department of Chemistry, Université de Montréal, P.O. Box 6128, Succ., Centre-ville, Montréal, Québec, Canada, H3C 3J7
| | - Stephen Hanessian
- Department of Chemistry, Université de Montréal, P.O. Box 6128, Succ., Centre-ville, Montréal, Québec, Canada, H3C 3J7
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8
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Yamada R, Sakata K, Yamada T. Electrochemical Synthesis of Substituted Morpholines via a Decarboxylative Intramolecular Etherification. Org Lett 2022; 24:1837-1841. [PMID: 35212222 DOI: 10.1021/acs.orglett.2c00377] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient method for the synthesis of 2,6-multisubstituted morpholines via an electrochemical intramolecular etherification has been developed. The method, which is operationally simple and easy to scale up, provides various substituted morpholine derivatives in high yields. The utility of this method is showcased by the synthesis of 2,2,6,6-tetrasubstituted morpholines, which are difficult to synthesize efficiently using previously reported strategies.
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Affiliation(s)
- Ryosuke Yamada
- Research Unit/Immunology & Inflammation, Sohyaku, Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, 1000 Kamoshida-cho, Aoba-ku, Yokohama 227-0033, Japan
| | - Komei Sakata
- Research Unit/Immunology & Inflammation, Sohyaku, Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, 1000 Kamoshida-cho, Aoba-ku, Yokohama 227-0033, Japan
| | - Takahiro Yamada
- Research Unit/Neuroscience, Sohyaku, Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, 1000 Kamoshida-cho, Aoba-ku, Yokohama 227-0033, Japan
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9
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Iwumene NUN, Moseley DF, Pullin RDC, Willis MC. Diverse saturated heterocycles from a hydroacylation/conjugate addition cascade. Chem Sci 2022; 13:1504-1511. [PMID: 35222935 PMCID: PMC8809418 DOI: 10.1039/d1sc06900d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 01/10/2022] [Indexed: 11/21/2022] Open
Abstract
Rhodium-catalyzed hydroacylation using alkynes substituted with pendant nucleophiles, delivers linear α,β-unsaturated enone intermediates with excellent regioselectivity. These adducts are used to construct a broad range of diversely substituted, saturated O-, N- and S-heterocycles in a one-pot process. Judicious choice of cyclisation conditions enabled isolation of O-heterocycles with high levels of diastereoselectivity. A variety of derivatisation reactions are also performed, generating functionalised hydroacylation products. This sequence serves as a general approach for the synthesis of fully saturated heterocycles.
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Affiliation(s)
- Ndidi U N Iwumene
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
| | - Daniel F Moseley
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
| | - Robert D C Pullin
- Vertex Pharmaceuticals (Europe) Ltd 86-88 Jubilee Avenue, Milton Park Abingdon OX14 4RW UK
| | - Michael C Willis
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
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10
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Nanda SK, Mallik R. Transition Metal-Catalyzed Hydroalkoxylation of Alkynes: An Overview. Chemistry 2021; 27:15571-15604. [PMID: 34343374 DOI: 10.1002/chem.202102194] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Indexed: 01/12/2023]
Abstract
Oxygen-bearing motifs, mainly the congener heterocycles are ubiquitous due to their presence in various natural products and bioactive scaffolds. Although in literature, several strategies have been developed for their synthesis, hydroalkoxylation of alkynes has come forward as a method of choice and has been used extensively. In particular, hydroalkoxylation of alkynes has gained enormous attention from the synthetic community due to the rapid access to a very useful and reactive synthetic intermediate like 'enol ether'. Furthermore, to manifold the utility of these methods, reports have been developed elaborating the generation of 'enol ether' using hydroalkoxylation and their usage in various reactions in cascade or tandem manner. This review focuses on recent development on the hydroalkoxylation of alkynes for the synthesis of oxygen-containing entities.
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Affiliation(s)
- Santosh K Nanda
- Department of Chemistry, School of Applied Science, Centurion University of Technology and Management Paralakhemundi, Odisha, 761211, India
| | - Rosy Mallik
- Department of Chemistry, School of Applied Science, Centurion University of Technology and Management Paralakhemundi, Odisha, 761211, India
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11
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Affiliation(s)
- Santosh K. Nanda
- Department of chemistry School of Applied Science Centurion University of Technology and Management Paralakhemundi Odisha 761211 India
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12
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Gharpure SJ, Nanda SK, Fartade DJ, Vishwakarma DS. Domino Hydroalkoxylation‐[4+2]‐Cycloaddition for Stereoselective Synthesis of 1,4‐Heterocycle‐Fused Chromenes: Rapid Access to the [6‐6‐7‐6] Tetracyclic Core of Cytorhizhins B–D. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901565] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Santosh J. Gharpure
- Department of Chemistry Indian Institute of Technology Bombay Powai 400076 Mumbai – India
| | - Santosh K. Nanda
- Department of Chemistry Indian Institute of Technology Bombay Powai 400076 Mumbai – India
| | - Dipak J. Fartade
- Department of Chemistry Indian Institute of Technology Bombay Powai 400076 Mumbai – India
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13
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Wang D, Liu Y, Zhu W, Shen H, Liu H, Fu L. Efficient Synthesis of Substituted Morpholine Derivatives via an Indium(III)-catalyzed Reductive Etherification Reaction. CHEM LETT 2020. [DOI: 10.1246/cl.200142] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Di Wang
- School of Pharmacy, Shanghai Jiao Tong University, No. 800 Dongchuan Rd., Shanghai 200240, P. R. China
- Roche Pharmaceutical Research & Early Development, Department of Medicinal Chemistry, Roche Innovation Center Shanghai, 720 Cailun Road, Building 5, Pudong, Shanghai 201203, P. R. China
| | - Yafei Liu
- Roche Pharmaceutical Research & Early Development, Department of Medicinal Chemistry, Roche Innovation Center Shanghai, 720 Cailun Road, Building 5, Pudong, Shanghai 201203, P. R. China
| | - Wei Zhu
- Roche Pharmaceutical Research & Early Development, Department of Medicinal Chemistry, Roche Innovation Center Shanghai, 720 Cailun Road, Building 5, Pudong, Shanghai 201203, P. R. China
| | - Hong Shen
- Roche Pharmaceutical Research & Early Development, Department of Medicinal Chemistry, Roche Innovation Center Shanghai, 720 Cailun Road, Building 5, Pudong, Shanghai 201203, P. R. China
| | - Haixia Liu
- Roche Pharmaceutical Research & Early Development, Department of Medicinal Chemistry, Roche Innovation Center Shanghai, 720 Cailun Road, Building 5, Pudong, Shanghai 201203, P. R. China
| | - Lei Fu
- School of Pharmacy, Shanghai Jiao Tong University, No. 800 Dongchuan Rd., Shanghai 200240, P. R. China
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14
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Jones KD, Nutt MJ, Comninos E, Sobolev AN, Moggach SA, Miura T, Murakami M, Stewart SG. A One-Pot Reaction of α-Imino Rhodium Carbenoids and Halohydrins: Access to 2,6-Substituted Dihydro-2H-1,4-oxazines. Org Lett 2020; 22:3490-3494. [DOI: 10.1021/acs.orglett.0c00947] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Kieran D. Jones
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Michael J. Nutt
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Elena Comninos
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Alexandre N. Sobolev
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
- Centre for Microscopy, Characterization and Analysis, The University of Western Australia, Perth, WA 6009, Australia
| | - Stephen A. Moggach
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
- Centre for Microscopy, Characterization and Analysis, The University of Western Australia, Perth, WA 6009, Australia
| | - Tomoya Miura
- Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Kyoto, 615-8510, Japan
| | - Masahiro Murakami
- Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Kyoto, 615-8510, Japan
| | - Scott G. Stewart
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
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15
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Morpholine as ubiquitous pharmacophore in medicinal chemistry: Deep insight into the structure-activity relationship (SAR). Bioorg Chem 2020; 96:103578. [PMID: 31978684 DOI: 10.1016/j.bioorg.2020.103578] [Citation(s) in RCA: 78] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 12/09/2019] [Accepted: 01/09/2020] [Indexed: 12/15/2022]
Abstract
Morpholine is a versatile moiety, a privileged pharmacophore and an outstanding heterocyclic motif with wide ranges of pharmacological activities due to different mechanisms of action. The ability of morpholine to enhance the potency of the molecule through molecular interactions with the target protein (kinases) or to modulate the pharmacokinetic properties propelled medicinal chemists and researchers to synthesize morpholine ring by the efficient ways and to incorporate this moiety to develop various lead compounds with diverse therapeutic activities. The present review primarily focused on discussing the most promising synthetic leads containing morpholine ring along with structure-activity relationship (SAR) to reveal the active pharmacophores accountable for anticancer, anti-inflammatory, antiviral, anticonvulsant, antihyperlipidemic, antioxidant, antimicrobial and antileishmanial activity. This review outlines some of the recent effective chemical synthesis for morpholine ring. The review also highlighted the metabolic liability of some clinical drugs containing this nucleus and various researches on modified morpholine to enhance the metabolic stability of drugs as well. Drugs bearing morpholine ring and those under clinical trials are also mentioned with the role of morpholine and their mechanism of action. This review will provide the necessary knowledge base to the medicinal chemists in making strategic structural changes in designing morpholine derivatives.
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16
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Jadhav SB, Chegondi R. Diastereoselective Desymmetrization of p-Quinamines through Regioselective Ring Opening of Epoxides and Aziridines. Org Lett 2019; 21:10115-10119. [DOI: 10.1021/acs.orglett.9b04110] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Sandip B. Jadhav
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Rambabu Chegondi
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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17
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Gharpure SJ, Nanda SK, Fartade DJ. Expeditious diastereoselective synthesis of medium ring heterocycle-fused chromenes via tandem 8/9-endo-dig and 8-exo-dig hydroalkoxylation-formal-[4 + 2] cycloaddition. Org Biomol Chem 2019; 17:8806-8810. [PMID: 31556431 DOI: 10.1039/c9ob02030f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first examples of highly diastereoselective tandem 8/9-endo-dig and 8-exo-dig hydroalkoxylation-formal-[4 + 2] cycloaddition are described for the synthesis of medium ring heterocycle-fused chromenes. TMS-alkynols preferred the exo-dig mode of hydroalkoxylation over the endo-dig mode leading to spiro-cyclic chromenes. The method could be used for the synthesis of linearly-fused ladder-like polyethers. A thia-heterocycle-fused chromene could be transformed into a complex bridged tricyclic ketal by a tandem carbene-insertion-[2,3]-sigmatropic shift.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India.
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18
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Park W, Kim Y, Park YS. Neutral Alcohol Nucleophiles for the Substitution of α-Bromo Aryl Acetates and Applications to Asymmetric Synthesis of Morpholine Derivatives. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900207] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Wongi Park
- Department of Chemistry; Konkuk University; 120 Neungdong-ro, Gwangjin-gu 05029 Seoul Korea
| | - Yongtae Kim
- Department of Chemistry; Konkuk University; 120 Neungdong-ro, Gwangjin-gu 05029 Seoul Korea
| | - Yong Sun Park
- Department of Chemistry; Konkuk University; 120 Neungdong-ro, Gwangjin-gu 05029 Seoul Korea
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19
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Gharpure SJ, Vishwakarma DS, Patel RK. TMSOTf mediated ‘5/6-endo-dig’ reductive hydroamination for the stereoselective synthesis of pyrrolidine and piperidine derivatives. Chem Commun (Camb) 2019; 55:6858-6861. [DOI: 10.1039/c9cc03127h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A TMSOTf mediated 5/6-endo-dig reductive hydroamination cascade on internal alkynylamines gave expedient, stereoselective access to pyrrolidine and piperidine derivatives. We also demonstrate that a protecting group on nitrogen has a profound effect on the reactivity as well as diastereoselectivity.
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Affiliation(s)
- Santosh J. Gharpure
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076
- India
| | | | - Raj K. Patel
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076
- India
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20
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Huh CW, Bechle BM, Warmus JS. Development of a scalable synthetic route towards a 2,2,6-trisubstituted chiral morpholine via stereoselective hydroalkoxylation. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.03.042] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Gharpure SJ, Anuradha D. Synthesis of Benzo[1,4]heterocycles using Palladium Catalyzed Heck Reaction to Vinylogous Carbonates/Carbamates: Unexpected Formation of Indoles via Carbopalladation Intercepted by Nucleopalladation. Org Lett 2017; 19:6136-6139. [PMID: 29083914 DOI: 10.1021/acs.orglett.7b03016] [Citation(s) in RCA: 21] [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 stereoselective synthesis of benzo[1,4]heterocycles via palladium catalyzed Heck reaction on o-halo-aryl-oxa/thia/aza tethered vinylogous carbonates/carbamates/esters has been developed. Unexpected formation of indoles is observed when unprotected 2-iodoaniline tethered vinylogous carbonates are subjected to the Heck reaction. Mechanistic studies indicate that formation of these indoles is an outcome of the interception of the carbopalladation step by nucleopalladation. The method can be used to gain rapid access to the core skeleton of abacopterin A-C.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay , Powai, Mumbai - 400076, India
| | - Dandela Anuradha
- Department of Chemistry, Indian Institute of Technology Bombay , Powai, Mumbai - 400076, India
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22
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Zhao C, Sojdak CA, Myint W, Seidel D. Reductive Etherification via Anion-Binding Catalysis. J Am Chem Soc 2017; 139:10224-10227. [PMID: 28741943 DOI: 10.1021/jacs.7b05832] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Reductive condensations of alcohols with aldehydes/ketones to generate ethers are catalyzed by a readily accessible thiourea organocatalyst that operates in combination with HCl. 1,1,3,3-tetramethyldisiloxane serves as a convenient reducing reagent. This strategy is applicable to challenging substrate combinations and exhibits functional group tolerance. Competing reductive homocoupling of the carbonyl component is suppressed.
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Affiliation(s)
- Chenfei Zhao
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , Piscataway, New Jersey 08854, United States
| | - Christopher A Sojdak
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , Piscataway, New Jersey 08854, United States
| | - Wazo Myint
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , Piscataway, New Jersey 08854, United States
| | - Daniel Seidel
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , Piscataway, New Jersey 08854, United States
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23
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Borah M, Borthakur U, Saikia AK. Diastereoselective Synthesis of Substituted Morpholines from N-Tethered Alkenols: Total Synthesis of (±)-Chelonin A. J Org Chem 2017; 82:1330-1339. [DOI: 10.1021/acs.joc.6b02260] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Madhurjya Borah
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Upasana Borthakur
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Anil K. Saikia
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
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24
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Lau YY, Zhai H, Schafer LL. Catalytic Asymmetric Synthesis of Morpholines. Using Mechanistic Insights To Realize the Enantioselective Synthesis of Piperazines. J Org Chem 2016; 81:8696-8709. [PMID: 27668321 DOI: 10.1021/acs.joc.6b01884] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
An efficient and practical catalytic approach for the enantioselective synthesis of 3-substituted morpholines through a tandem sequential one-pot reaction employing both hydroamination and asymmetric transfer hydrogenation reactions is described. Starting from ether-containing aminoalkyne substrates, a commercially available bis(amidate)bis(amido)Ti catalyst is utilized to yield a cyclic imine that is subsequently reduced using the Noyori-Ikariya catalyst, RuCl [(S,S)-Ts-DPEN] (η6-p-cymene), to afford chiral 3-substituted morpholines in good yield and enantiomeric excesses of >95%. A wide range of functional groups is tolerated. Substrate scope investigations suggest that hydrogen-bonding interactions between the oxygen in the backbone of the ether-containing substrate and the [(S,S)-Ts-DPEN] ligand of the Ru catalyst are crucial for obtaining high ee's. This insight led to a mechanistic proposal that predicts the observed absolute stereochemistry. Most importantly, this mechanistic insight allowed for the extension of this strategy to include N as an alternative hydrogen bond acceptor that could be incorporated into the substrate. Thus, the catalytic, enantioselective synthesis of 3-substituted piperazines is also demonstrated.
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Affiliation(s)
- Ying Yin Lau
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - Huimin Zhai
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - Laurel L Schafer
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
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25
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Ghosh P, Deka MJ, Saikia AK. Lewis acid mediated intramolecular C–O bond formation of alkanol-epoxide leading to substituted morpholine and 1,4-oxazepane derivatives: total synthesis of (±)–Viloxazine. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.12.015] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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Deka MJ, Indukuri K, Sultana S, Borah M, Saikia AK. Synthesis of Five-, Six-, and Seven-Membered 1,3- and 1,4-Heterocyclic Compounds via Intramolecular Hydroalkoxylation/Hydrothioalkoxylation of Alkenols/Thioalkenols. J Org Chem 2015; 80:4349-59. [DOI: 10.1021/acs.joc.5b00049] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Manash J. Deka
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, India
| | - Kiran Indukuri
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, India
| | - Sabera Sultana
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, India
| | - Madhurjya Borah
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, India
| | - Anil K. Saikia
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, India
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27
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Kalutharage N, Yi CS. Chemoselective formation of unsymmetrically substituted ethers from catalytic reductive coupling of aldehydes and ketones with alcohols in aqueous solution. Org Lett 2015; 17:1778-81. [PMID: 25803313 DOI: 10.1021/acs.orglett.5b00553] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A well-defined cationic Ru-H complex catalyzes reductive etherification of aldehydes and ketones with alcohols. The catalytic method employs environmentally benign water as the solvent and cheaply available molecular hydrogen as the reducing agent to afford unsymmetrical ethers in a highly chemoselective manner.
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Affiliation(s)
- Nishantha Kalutharage
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881 United States
| | - Chae S Yi
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881 United States
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28
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Gharpure SJ, Anuradha D, Prasad JVK, Srinivasa Rao P. Stereoselective Synthesis ofcis-2,6-Disubstituted Morpholines and 1,4-Oxathianes by Intramolecular Reductive Etherification of 1,5-Diketones. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403294] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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29
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Synthesis and antibacterial activity of (1-aryl-1, 2, 3-triazol-4-yl) methyl esters of morpholine-3-carboxylic acid. Med Chem Res 2014. [DOI: 10.1007/s00044-014-1076-z] [Citation(s) in RCA: 15] [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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30
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Pal’chikov VA. Morpholines. Synthesis and biological activity. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2013. [DOI: 10.1134/s1070428013060018] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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31
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Abstract
This review covers the literature published in 2011 for marine natural products, with 870 citations (558 for the period January to December 2011) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1152 for 2011), together with the relevant biological activities, source organisms and country of origin. Biosynthetic studies, first syntheses, and syntheses that lead to the revision of structures or stereochemistries, have been included.
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Affiliation(s)
- John W Blunt
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand.
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32
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Gharpure SJ, Prasad JVK. Stereoselective Synthesis of Substituted 1,4-Oxazepanes by Intramolecular Reductive Etherification. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300135] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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33
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Sawant RT, Stevenson J, Odell LR, Arvidsson PI. Organocatalytic asymmetric cross-aldol reaction of 2-chloroethoxy acetaldehyde: diversity-oriented synthesis of chiral substituted 1,4-dioxanes and morpholines. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2012.12.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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34
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35
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McGhee A, Cochran BM, Stenmark TA, Michael FE. Stereoselective synthesis of 2,5-disubstituted morpholines using a palladium-catalyzed hydroamination reaction. Chem Commun (Camb) 2013; 49:6800-2. [DOI: 10.1039/c3cc44117b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Zhou J, Zhou L, Yeung YY. Multicomponent Approach in the Synthesis of 2,2,6-Trisubstituted Morpholine Derivatives. Org Lett 2012; 14:5250-3. [DOI: 10.1021/ol3024105] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jing Zhou
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Ling Zhou
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Ying-Yeung Yeung
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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37
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Sequeira FC, Chemler SR. Stereoselective synthesis of morpholines via copper-promoted oxyamination of alkenes. Org Lett 2012; 14:4482-5. [PMID: 22894680 PMCID: PMC3465956 DOI: 10.1021/ol301984b] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A new copper(II) 2-ethylhexanoate-promoted addition of an alcohol and an amine across an alkene (oxyamination) is reported. The alcohol addition is intramolecular, while coupling with the amine occurs intermolecularly. Several 2-aminomethyl morpholines were synthesized in good to excellent yields and diastereoselectivities.
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Affiliation(s)
- Fatima C. Sequeira
- Department of Chemistry, The State University of New York at Buffalo, Buffalo, New York 14260
| | - Sherry R. Chemler
- Department of Chemistry, The State University of New York at Buffalo, Buffalo, New York 14260
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38
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Pandey G, Gaikwad AL, Gadre SR. Dimethyl [(2R,3R,5S)-5-phenylmorpholine-2,3-diyl]diacetate as a Designer Substrate in the Syntheses of Important Heterocyclic Scaffolds. ASIAN J ORG CHEM 2012. [DOI: 10.1002/ajoc.201200033] [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]
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