1
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Galeote O, Kennington SCD, Benedito G, Fraedrich L, Davies-Howe E, Costa AM, Romea P, Urpí F, Aullón G, Font-Bardia M, Puigjaner C. Direct, Stereodivergent, and Catalytic Michael Additions of Thioimides to α,β-Unsaturated Aldehydes - Total Synthesis of Tapentadol. Angew Chem Int Ed Engl 2024; 63:e202319308. [PMID: 38231568 DOI: 10.1002/anie.202319308] [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: 12/14/2023] [Revised: 01/17/2024] [Accepted: 01/17/2024] [Indexed: 01/18/2024]
Abstract
Direct and stereodivergent Michael additions of N-acyl 1,3-thiazinane-2-thiones to α,β-unsaturated aldehydes catalyzed by chiral nickel(II) complexes are reported. The reactions proceed with a remarkable regio-, diastereo-, and enantioselectivity, so access to any of the four potential Michael stereoisomers is granted through the appropriate choice of the chiral ligand of the nickel(II) complex. Simple removal of the heterocyclic scaffold furnishes a wide array of either syn or anti enantiomerically pure derivatives, which can be exploited for the asymmetric synthesis of biologically active compounds, as demonstrated in a new approach to tapentadol. In turn, a mechanism, based on theoretical calculations, is proposed to account for the stereochemical outcome of these transformations.
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Affiliation(s)
- Oriol Galeote
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Institut de Biomedicina de la Universitat de Barcelona, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Stuart C D Kennington
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Institut de Biomedicina de la Universitat de Barcelona, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Gabriela Benedito
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Institut de Biomedicina de la Universitat de Barcelona, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Lena Fraedrich
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Institut de Biomedicina de la Universitat de Barcelona, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Evan Davies-Howe
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Institut de Biomedicina de la Universitat de Barcelona, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Anna M Costa
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Institut de Biomedicina de la Universitat de Barcelona, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Pedro Romea
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Institut de Biomedicina de la Universitat de Barcelona, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Fèlix Urpí
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Institut de Biomedicina de la Universitat de Barcelona, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Gabriel Aullón
- Department of Inorganic and Organic Chemistry, Section of Inorganic Chemistry and Institut de Química Teòrica i Computacional de la Universitat de Barcelona, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Mercè Font-Bardia
- X-Ray Diffraction Unity, CCiTUB, Universitat de Barcelona, Carrer Solé i Sabarís 1-3, 08028, Barcelona, Spain
| | - Cristina Puigjaner
- X-Ray Diffraction Unity, CCiTUB, Universitat de Barcelona, Carrer Solé i Sabarís 1-3, 08028, Barcelona, Spain
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2
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Mellado-Hidalgo M, Romero-Cavagnaro EA, Nageswaran S, Puddu S, Kennington SCD, Costa AM, Romea P, Urpí F, Aullón G, Font-Bardia M. Protected syn-Aldol Compounds from Direct, Catalytic, and Enantioselective Reactions of N-Acyl-1,3-oxazinane-2-thiones with Aromatic Acetals. Org Lett 2023; 25:659-664. [PMID: 36700336 PMCID: PMC9903318 DOI: 10.1021/acs.orglett.2c04254] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A direct and asymmetric syn-aldol reaction of N-acyl-1,3-oxazinane-2-thiones with dialkyl acetals from aromatic acetals in the presence of 2-5 mol % [DTBM-SEGPHOS]NiCl2, TMSOTf, and lutidine has been developed. It has been established that the oxazinanethione heterocycle, used for the first time as a scaffold in asymmetric carbon-carbon bond-forming reactions, can be smoothly removed to give access to a variety of enantiomerically pure compounds with high synthetic value.
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Affiliation(s)
- Miguel Mellado-Hidalgo
- †Department
of Inorganic and Organic Chemistry, Section of Organic
Chemistry and ‡Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Spain
| | - Elias A. Romero-Cavagnaro
- †Department
of Inorganic and Organic Chemistry, Section of Organic
Chemistry and ‡Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Spain
| | - Sajanthanaa Nageswaran
- †Department
of Inorganic and Organic Chemistry, Section of Organic
Chemistry and ‡Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Spain
| | - Sabrina Puddu
- †Department
of Inorganic and Organic Chemistry, Section of Organic
Chemistry and ‡Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Spain
| | - Stuart C. D. Kennington
- †Department
of Inorganic and Organic Chemistry, Section of Organic
Chemistry and ‡Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Spain
| | - Anna M. Costa
- †Department
of Inorganic and Organic Chemistry, Section of Organic
Chemistry and ‡Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Spain,
| | - Pedro Romea
- †Department
of Inorganic and Organic Chemistry, Section of Organic
Chemistry and ‡Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Spain,
| | - Fèlix Urpí
- †Department
of Inorganic and Organic Chemistry, Section of Organic
Chemistry and ‡Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Spain,
| | - Gabriel Aullón
- Department
of Inorganic and Organic Chemistry, Section of Inorganic Chemistry
and Institut de Química Teòrica i Computacional de la
Universitat de Barcelona, Universitat de
Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Spain
| | - Mercè Font-Bardia
- X-Ray
Diffraction Unity, CCiTUB, Universitat de
Barcelona, Carrer Solé i Sabarís 1-3, 08028 Barcelona, Spain
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3
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Teloxa SF, Mellado‐Hidalgo M, Kennington SCD, Romea P, Urpí F, Aullón G, Font‐Bardia M. Direct and Asymmetric Aldol Reactions of
N
‐Azidoacetyl‐1,3‐thiazolidine‐2‐thione Catalyzed by Chiral Nickel(II) Complexes. A New Approach to the Synthesis of β‐Hydroxy‐α‐Amino Acids. Chemistry 2022; 28:e202200671. [PMID: 35504848 PMCID: PMC9401014 DOI: 10.1002/chem.202200671] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Indexed: 12/02/2022]
Abstract
A direct and asymmetric triisopropylsilyltrifluoromethanesulfonate (TIPSOTf) mediated aldol reaction of N‐azidoacetyl‐1,3‐thiazolidine‐2‐thione with aromatic aldehydes catalyzed by a chiral nickel(II)‐Tol‐BINAP complex has been developed (BINAP=2,2’‐bis(diphenylphosphino)‐1,1’‐binaphthyl). The catalytic protocol gives the corresponding anti α‐azido‐β‐silyloxy adducts with outstanding stereocontrol and in high yields. Theoretical calculations account for the stereochemical outcome of the reaction and lay the foundations for a mechanistic model. In turn, the easy removal of the thiazolidinethione yields a wide array of enantiomerically pure derivatives in a straightforward and efficient manner. Such a noteworthy character of the heterocyclic scaffold together with the appropriate manipulation of the azido group open a new route to the synthesis of di‐ and tripeptide blocks containing a β‐aryl‐β‐hydroxy‐α‐amino acid.
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Affiliation(s)
- Saul F. Teloxa
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry and Institut de Biomedicina de la Universitat de Barcelona Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona (Catalonia Spain
| | - Miguel Mellado‐Hidalgo
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry and Institut de Biomedicina de la Universitat de Barcelona Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona (Catalonia Spain
| | - Stuart C. D. Kennington
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry and Institut de Biomedicina de la Universitat de Barcelona Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona (Catalonia Spain
| | - Pedro Romea
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry and Institut de Biomedicina de la Universitat de Barcelona Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona (Catalonia Spain
| | - Fèlix Urpí
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry and Institut de Biomedicina de la Universitat de Barcelona Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona (Catalonia Spain
| | - Gabriel Aullón
- Department of Inorganic and Organic Chemistry Section of Inorganic Chemistry and Institut de Química Teòrica i Computacional de la Universitat de Barcelona Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona (Catalonia Spain
| | - Mercè Font‐Bardia
- X-Ray Diffraction Unit. CCiTUB Universitat de Barcelona Carrer Solé i Sabarís 1–3 08028 Barcelona (Catalonia Spain
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4
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Pérez-Palau M, Sanosa N, Romea P, Urpí F, López R, Gómez-Bengoa E, Font-Bardia M. Stereoselective Alkylation of Chiral Titanium(IV) Enolates with tert-Butyl Peresters. Org Lett 2021; 23:8852-8856. [PMID: 34699246 PMCID: PMC8609576 DOI: 10.1021/acs.orglett.1c03366] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Here, we present
a new stereoselective alkylation of titanium(IV)
enolates of chiral N-acyl oxazolidinones with tert-butyl peresters from Cα-branched aliphatic carboxylic
acids, which proceeds through the decarboxylation of the peresters
and the subsequent formation of alkyl radicals to produce the alkylated
adducts with an excellent diastereoselectivity. Theoretical calculations
account for the observed reactivity and the outstanding stereocontrol.
Importantly, the resultant compounds can be easily converted into
ligands for asymmetric and catalytic transformations.
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Affiliation(s)
- Marina Pérez-Palau
- Secció de Química Orgànica, Departament de Química Inorgànica i Orgànica and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Nil Sanosa
- Secció de Química Orgànica, Departament de Química Inorgànica i Orgànica and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Pedro Romea
- Secció de Química Orgànica, Departament de Química Inorgànica i Orgànica and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Fèlix Urpí
- Secció de Química Orgànica, Departament de Química Inorgànica i Orgànica and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Rosa López
- Departamento de Química Orgánica I, Universidad del Pais Vasco, UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain
| | - Enrique Gómez-Bengoa
- Departamento de Química Orgánica I, Universidad del Pais Vasco, UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain
| | - Mercè Font-Bardia
- Unitat de Difracció de RX. CCiTUB. Universitat de Barcelona. Carrer Solé i Sabarís 1-3, 08028 Barcelona, Catalonia, Spain
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5
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Kennington SCD, Teloxa SF, Mellado-Hidalgo M, Galeote O, Puddu S, Bellido M, Romea P, Urpí F, Aullón G, Font-Bardia M. Direct and Enantioselective Aldol Reactions Catalyzed by Chiral Nickel(II) Complexes. Angew Chem Int Ed Engl 2021; 60:15307-15312. [PMID: 33872449 PMCID: PMC8362213 DOI: 10.1002/anie.202104352] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/12/2021] [Indexed: 01/07/2023]
Abstract
A direct and asymmetric aldol reaction of N‐acyl thiazinanethiones with aromatic aldehydes catalyzed by chiral nickel(II) complexes is reported. The reaction gives the corresponding O‐TIPS‐protected anti‐aldol adducts in high yields and with remarkable stereocontrol and atom economy. Furthermore, the straightforward removal of the achiral scaffold provides enantiomerically pure intermediates of synthetic interest, which involve precursors for anti‐α‐amino‐β‐hydroxy and α,β‐dihydroxy carboxylic derivatives. Theoretical calculations explain the observed high stereocontrol.
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Affiliation(s)
- Stuart C D Kennington
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Saul F Teloxa
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Miguel Mellado-Hidalgo
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Oriol Galeote
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Sabrina Puddu
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Marina Bellido
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Pedro Romea
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Fèlix Urpí
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Gabriel Aullón
- Department of Inorganic and Organic Chemistry, Section of Inorganic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Mercè Font-Bardia
- X-ray Diffraction Unity, CCiTUB, Universitat de Barcelona, Carrer Solé i Sabarís 1-3, 08028, Barcelona, Spain
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6
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Kennington SCD, Teloxa SF, Mellado‐Hidalgo M, Galeote O, Puddu S, Bellido M, Romea P, Urpí F, Aullón G, Font‐Bardia M. Direct and Enantioselective Aldol Reactions Catalyzed by Chiral Nickel(II) Complexes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104352] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Stuart C. D. Kennington
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Saul F. Teloxa
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Miguel Mellado‐Hidalgo
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Oriol Galeote
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Sabrina Puddu
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Marina Bellido
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Pedro Romea
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Fèlix Urpí
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Gabriel Aullón
- Department of Inorganic and Organic Chemistry Section of Inorganic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Mercè Font‐Bardia
- X-ray Diffraction Unity CCiTUB Universitat de Barcelona Carrer Solé i Sabarís 1–3 08028 Barcelona Spain
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7
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Teloxa SF, Kennington SCD, Camats M, Romea P, Urpí F, Aullón G, Font‐Bardia M. Direct, Enantioselective, and Nickel(II) Catalyzed Reactions of
N
‐Azidoacetyl Thioimides with Trimethyl Orthoformate: A New Combined Methodology for the Rapid Synthesis of Lacosamide and Derivatives. Chemistry 2020; 26:11540-11548. [DOI: 10.1002/chem.202001057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/25/2020] [Indexed: 11/07/2022]
Affiliation(s)
- Saul F. Teloxa
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Stuart C. D. Kennington
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Marc Camats
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Pedro Romea
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Fèlix Urpí
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Gabriel Aullón
- Department of Inorganic and Organic Chemistry Section of Inorganic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11, 0 8028 Barcelona Spain
| | - Mercè Font‐Bardia
- X-ray Diffraction Unity, CCiTUB Universitat de Barcelona Carrer Solé i Sabarís 1–3 08028 Barcelona Spain
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8
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Szostak M, Li G. Non-Classical Amide Bond Formation: Transamidation and Amidation of Activated Amides and Esters by Selective N–C/O–C Cleavage. SYNTHESIS-STUTTGART 2020. [DOI: 10.1055/s-0040-1707101] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In the past several years, tremendous advances have been made in non-classical routes for amide bond formation that involve transamidation and amidation reactions of activated amides and esters. These new methods enable the formation of extremely valuable amide bonds via transition-metal-catalyzed, transition-metal-free, or metal-free pathways by exploiting chemoselective acyl C–X (X = N, O) cleavage under mild conditions. In a broadest sense, these reactions overcome the formidable challenge of activating C–N/C–O bonds of amides or esters by rationally tackling nN → π*C=O delocalization in amides and nO → π*C=O donation in esters. In this account, we summarize the recent remarkable advances in the development of new methods for the synthesis of amides with a focus on (1) transition-metal/NHC-catalyzed C–N/C–O bond activation, (2) transition-metal-free highly selective cleavage of C–N/C–O bonds, (3) the development of new acyl-transfer reagents, and (4) other emerging methods.1 Introduction2 Transamidation of Amides2.1 Transamidation by Metal–NHC Catalysis (Pd–NHC, Ni–NHC)2.2 Transition-Metal-Free Transamidation via Tetrahedral Intermediates2.3 Reductive Transamidation2.4 New Acyl-Transfer Reagents2.5 Tandem Transamidations3 Amidation of Esters3.1 Amidation of Esters by Metal–NHC Catalysis (Pd–NHC, Ni–NHC)3.2 Transition-Metal-Free Amidation of Esters via Tetrahedral Intermediates3.3 Reductive Amidation of Esters4 Transamidations of Amides by Other Mechanisms5 Conclusions and Outlook
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Romo JM, Romea P, Urpí F. Direct anti
Glycolate Aldol Reaction of Protected Chiral N
-Hydroxyacetyl Thiazolidinethiones with Acetals Catalyzed by a Nickel(II) Complex. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901097] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Juan Manuel Romo
- Department of Inorganic and Organic Chemistry; Section of Organic Chemistry, and Institute of Biomedicine (IBUB); University of Barcelona; Carrer Martí I Franqués 1-11 08028 Barcelona Catalonia Spain
| | - Pedro Romea
- Department of Inorganic and Organic Chemistry; Section of Organic Chemistry, and Institute of Biomedicine (IBUB); University of Barcelona; Carrer Martí I Franqués 1-11 08028 Barcelona Catalonia Spain
| | - Fèlix Urpí
- Department of Inorganic and Organic Chemistry; Section of Organic Chemistry, and Institute of Biomedicine (IBUB); University of Barcelona; Carrer Martí I Franqués 1-11 08028 Barcelona Catalonia Spain
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10
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Fernández-Valparis J, Romea P, Urpí F. Stereoselective Synthesis of Protected Peptides Containing an anti
β-Hydroxy Tyrosine. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Javier Fernández-Valparis
- Department of Inorganic and Organic Chemistry; Section of Organic Chemistry, and Institute of Biomedicine (IBUB); University of Barcelona; Carrer Martí i Franqués 1-11 08028 Barcelona, Catalonia Spain
| | - Pedro Romea
- Department of Inorganic and Organic Chemistry; Section of Organic Chemistry, and Institute of Biomedicine (IBUB); University of Barcelona; Carrer Martí i Franqués 1-11 08028 Barcelona, Catalonia Spain
| | - Fèlix Urpí
- Department of Inorganic and Organic Chemistry; Section of Organic Chemistry, and Institute of Biomedicine (IBUB); University of Barcelona; Carrer Martí i Franqués 1-11 08028 Barcelona, Catalonia Spain
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