1
|
Saunthwal RK, Schwarz M, Mallick RK, Terry-Wright W, Clayden J. Enantioselective Intramolecular α-Arylation of Benzylamine Derivatives: Synthesis of a Precursor to Levocetirizine. Angew Chem Int Ed Engl 2023; 62:e202216758. [PMID: 36698284 DOI: 10.1002/anie.202216758] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 01/20/2023] [Accepted: 01/24/2023] [Indexed: 01/27/2023]
Abstract
A practical, transition metal-free method allows the enantioselective synthesis of α,α-diarylmethylamines by asymmetric α-arylation of benzylamines. Enantioselective lithiation of N'-aryl-N-benzyl-N-isopropyl ureas using a chiral lithium amide base generates a benzyllithium that undergoes an unactivated stereospecific intramolecular nucleophilic aromatic substitution to generate an α,α-diarylmethylamine in the form of its urea derivative, in up to >99 % ee. Treatment with acid induces an "azatropic shift" with retention of configuration, the product of which may be hydrolysed to the target amine.
Collapse
Affiliation(s)
- Rakesh K Saunthwal
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Maria Schwarz
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Rajendra K Mallick
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - William Terry-Wright
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Jonathan Clayden
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| |
Collapse
|
2
|
Fu X, Yan Y, Sun H, Li S, Huang J. Natural Product-Inspired Chiral Ligand Design: Aloperine and N-Substituted Aloperines-Induced Pd-Catalyzed Asymmetric Hydroarylation of Ketimines. J Org Chem 2022; 87:9565-9575. [PMID: 35834751 DOI: 10.1021/acs.joc.2c00554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A naturally occurring alkaloid aloperine was utilized as a chiral skeleton for the development of new ligands/catalysts in asymmetric synthesis. A number of N-substituted aloperines have been prepared, and a Pd-catalyzed asymmetric hydroarylation of ketimines using these chiral 1,3-diamine ligands was reported. A range of chiral sulfonyl amides were prepared in high yields and enantioselectivities. The stereoselectivity and structure relationships of aloperines have been studied. In addition, preliminary studies on the desymmetrization of meso-anhydride have also shown that these diamines have good potential in organocatalysis. These discoveries would provide a new future development for natural product-inspired chiral ligand design and developments.
Collapse
Affiliation(s)
- Xuegang Fu
- School of Pharmaceutical Science and Technology, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China.,Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Yuting Yan
- School of Pharmaceutical Science and Technology, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China.,Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Hexin Sun
- School of Pharmaceutical Science and Technology, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China.,Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Siying Li
- School of Pharmaceutical Science and Technology, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China.,Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Jianhui Huang
- School of Pharmaceutical Science and Technology, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China.,Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, P. R. China
| |
Collapse
|
3
|
Ghosh AK, Basu AJ, Hsu CS, Yadav M. Asymmetric 1,2-Carbamoyl Rearrangement of Lithiated Chiral Oxazolidine Carbamates and Diastereoselective Synthesis of α-Hydroxy Amides. Chemistry 2022; 28:e202200941. [PMID: 35587995 PMCID: PMC9356997 DOI: 10.1002/chem.202200941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Indexed: 11/11/2022]
Abstract
Asymmetric 1,2-carbamoyl rearrangement of lithiated 2-alkenyl carbamates has been investigated. Deprotonation of chiral 2-alkenyl oxazolidine carbamates with sec-butyllithium in ether at -78 °C followed by warming of the resulting 1-lithio-2-alkenyl derivatives to room temperature resulted in 1,2-carbamoyl rearrangement to provide α-hydroxy amides. The rearrangement proceeded with excellent diastereoselectivity and in good to excellent isolated yield of the α-hydroxy amide derivatives. The substrate scope of the reaction was investigated with a variety of 2-alkenyl and benzyl oxazolidine carbamates. A stereochemical model is provided to explain the stereochemical outcome associated with the rearrangement. Acid-catalyzed removal of the chiral oxazolidine afforded α-hydroxy acid in high optical purity.
Collapse
Affiliation(s)
- Arun K Ghosh
- Department of Chemistry and Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, 560 Oval Dr., West Lafayette, IN 47907, USA
| | - Amartyo J Basu
- Department of Chemistry and Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, 560 Oval Dr., West Lafayette, IN 47907, USA
| | - Che-Sheng Hsu
- Department of Chemistry and Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, 560 Oval Dr., West Lafayette, IN 47907, USA
| | - Monika Yadav
- Department of Chemistry and Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, 560 Oval Dr., West Lafayette, IN 47907, USA
| |
Collapse
|
4
|
Freure GPR, Skrotzki EA, Lavertu JDE, Newman SG. Palladium-Catalyzed Cross-Coupling of Superbase-Generated C(sp 3) Nucleophiles. ACS Catal 2021. [DOI: 10.1021/acscatal.1c03180] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Garrett P. R. Freure
- Centre for Catalysis Research and Innovation, Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie, Ottawa, Ontario, Canada K1N 6N5
| | - Eric A. Skrotzki
- Centre for Catalysis Research and Innovation, Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie, Ottawa, Ontario, Canada K1N 6N5
| | - Jean-Danick E. Lavertu
- Centre for Catalysis Research and Innovation, Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie, Ottawa, Ontario, Canada K1N 6N5
| | - Stephen G. Newman
- Centre for Catalysis Research and Innovation, Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie, Ottawa, Ontario, Canada K1N 6N5
| |
Collapse
|
5
|
Lin W, Zhang KF, Baudoin O. Regiodivergent enantioselective C-H functionalization of Boc-1,3-oxazinanes and application to the synthesis of β 2 and β 3-amino acids. Nat Catal 2019; 2:882-888. [PMID: 31620675 PMCID: PMC6795538 DOI: 10.1038/s41929-019-0336-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
β2- and β3-Amino acids are important
chiral building blocks for the design of new pharmaceuticals and
peptidomimetics. Here we report a straightforward regio- and enantiodivergent
access to these compounds using a one-pot reaction composed of
sparteine-mediated enantioselective lithiation of a Boc-1,3-oxazinane,
transmetallation to zinc and direct or migratory Negishi coupling with an
organic electrophile. The regioselectivity of the Negishi coupling was highly
ligand-controlled and switchable to obtain the C4- or the C5-functionalized
product exclusively. High enantioselectivities were achieved on a broad range of
examples, and a catalytic version in chiral diamine was developed using the
(+)-sparteine surrogate. Selected C4- and C5-functionalized Boc-1,3-oxazinanes
were subsequently converted to highly enantio-enriched β2- and
β3-amino acids with the (R) or
(S) configuration, depending on the sparteine enantiomer
employed in the lithiation step.
Collapse
Affiliation(s)
- Weilong Lin
- University of Basel, Department of Chemistry, St. Johanns-Ring 19, CH-4056 Basel, Switzerland
| | - Ke-Feng Zhang
- University of Basel, Department of Chemistry, St. Johanns-Ring 19, CH-4056 Basel, Switzerland
| | - Olivier Baudoin
- University of Basel, Department of Chemistry, St. Johanns-Ring 19, CH-4056 Basel, Switzerland
| |
Collapse
|
6
|
Monticelli S, Holzer W, Langer T, Roller A, Olofsson B, Pace V. Sustainable Asymmetric Organolithium Chemistry: Enantio- and Chemoselective Acylations through Recycling of Solvent, Sparteine, and Weinreb "Amine". CHEMSUSCHEM 2019; 12:1147-1154. [PMID: 30614208 PMCID: PMC6704367 DOI: 10.1002/cssc.201802815] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Revised: 12/20/2018] [Indexed: 05/10/2023]
Abstract
The well-established Hoppe-Beak chemistry, which involves enantioselective generation of organolithium compounds in the presence of (-)-sparteine, was revisited and applied to unprecedented acylations with Weinreb amides to access highly enantioenriched α-oxyketones and cyclic α-aminoketones. Recycling of the sustainable solvent cyclopentyl methyl ether, sparteine, and the released Weinreb "amine" [HNMe(OMe)] was possible through a simple work-up procedure that enabled full recovery of these precious materials. The methodology features a robust scope and flexibility, thus allowing the enantioselective preparation of scaffolds amenable of further derivatization.
Collapse
Affiliation(s)
- Serena Monticelli
- Department of Pharmaceutical ChemistryUniversity of ViennaAlthanstrasse,14Vienna1090Austria
| | - Wolfgang Holzer
- Department of Pharmaceutical ChemistryUniversity of ViennaAlthanstrasse,14Vienna1090Austria
| | - Thierry Langer
- Department of Pharmaceutical ChemistryUniversity of ViennaAlthanstrasse,14Vienna1090Austria
| | - Alexander Roller
- X-Ray Structure Analysis CenterUniversity of ViennaWaehringerstrasse 42Vienna1090Austria
| | - Berit Olofsson
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm UniversitySe-106 91StockholmSweden
| | - Vittorio Pace
- Department of Pharmaceutical ChemistryUniversity of ViennaAlthanstrasse,14Vienna1090Austria
| |
Collapse
|
7
|
Royal T, Baudoin O. Pd-catalyzed γ-arylation of γ,δ-unsaturated O-carbamates via an unusual haptotropic rearrangement. Chem Sci 2019; 10:2331-2335. [PMID: 30881660 PMCID: PMC6385668 DOI: 10.1039/c8sc05058a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 12/21/2018] [Indexed: 11/21/2022] Open
Abstract
An unusual γ-selectivity was observed in the arylation of γ,δ-unsaturated O-carbamates involving directed lithiation, transmetallation to zinc and Negishi coupling, when a specific combination of aryl electrophile and phosphine ligand is employed. Mechanistic studies indicate that an unusual, stereospecific haptotropic rearrangement of the palladium-diene intermediate is involved.
Collapse
Affiliation(s)
- Titouan Royal
- University of Basel , Department of Chemistry , St. Johanns-Ring 19 , CH-4056 Basel , Switzerland .
| | - Olivier Baudoin
- University of Basel , Department of Chemistry , St. Johanns-Ring 19 , CH-4056 Basel , Switzerland .
| |
Collapse
|
8
|
Mykura RC, Veth S, Varela A, Dewis L, Farndon JJ, Myers EL, Aggarwal VK. Investigation of the Deprotonative Generation and Borylation of Diamine-Ligated α-Lithiated Carbamates and Benzoates by in Situ IR spectroscopy. J Am Chem Soc 2018; 140:14677-14686. [PMID: 30260635 DOI: 10.1021/jacs.8b06871] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diamine-mediated α-deprotonation of O-alkyl carbamates or benzoates with alkyllithium reagents, trapping of the carbanion with organoboron compounds, and 1,2-metalate rearrangement of the resulting boronate complex are the primary steps by which organoboron compounds can be stereoselectively homologated. Although the final step can be easily monitored by 11B NMR spectroscopy, the first two steps, which are typically carried out at cryogenic temperatures, are less well understood owing to the requirement for specialized analytical techniques. Investigation of these steps by in situ IR spectroscopy has provided invaluable data for optimizing the homologation reactions of organoboron compounds. Although the deprotonation of benzoates in noncoordinating solvents is faster than that in ethereal solvents, the deprotonation of carbamates shows the opposite trend, a difference that has its origin in the propensity of carbamates to form inactive parasitic complexes with the diamine-ligated alkyllithium reagent. Borylation of bulky diamine-ligated lithiated species in toluene is extremely slow, owing to the requirement for initial complexation of the oxygen atoms of the diol ligand on boron with the lithium ion prior to boron-lithium exchange. However, ethereal solvent, or very small amounts of THF, facilitate precomplexation through initial displacement of the bulky diamines coordinated to the lithium ion. Comparison of the carbonyl stretching frequencies of boronates derived from pinacol boronic esters with those derived from trialkylboranes suggests that the displaced lithium ion is residing on the pinacol oxygen atoms and the benzoate/carbamate carbonyl group, respectively, explaining, at least in part, the faster 1,2-metalate rearrangements of boronates derived from the trialkylboranes.
Collapse
Affiliation(s)
- Rory C Mykura
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | - Simon Veth
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | - Ana Varela
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | - Lydia Dewis
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | - Joshua J Farndon
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | - Eddie L Myers
- School of Chemistry , NUI Galway , Galway H91 TK33 , Ireland
| | - Varinder K Aggarwal
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| |
Collapse
|