51
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Melot R, Craveiro MV, Baudoin O. Total Synthesis of (Nor)illudalane Sesquiterpenes Based on a C(sp 3)-H Activation Strategy. J Org Chem 2019; 84:12933-12945. [PMID: 31322348 DOI: 10.1021/acs.joc.9b01669] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Three (nor)illudalane sesquiterpenes were synthesized from a common intermediate in racemic and enantioenriched forms using Pd0-catalyzed C(sp3)-H arylation as a key step. The configuration of the isolated, highly symmetric quaternary stereocenter of the target molecules was controlled through a matched combination of chiral substrate and catalyst. Moreover, the recently developed Ir-catalyzed C-H borylation/Cu-catalyzed methylation method was employed to install the methyl group on the benzene ring. This strategy allowed the efficient synthesis of both racemic and (S)-configured puraquinonic acid, deliquinone, and russujaponol F.
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52
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Baumgartner Y, Niggli N, Savary D, Thesmar P, Baudoin O. Swiss Science Concentrates. Chimia (Aarau) 2019. [DOI: 10.2533/chimia.2019.503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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53
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Baumgartner Y, Niggli N, Savary D, Thesmar P, Baudoin O. Swiss Science Concentrates. Chimia (Aarau) 2019; 73:415. [DOI: 10.2533/chimia.2019.415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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54
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Baumgartner Y, Niggli N, Savary D, Thesmar P, Baudoin O. Swiss Science Concentrates. Chimia (Aarau) 2019. [DOI: 10.2533/chimia.2019.329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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55
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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.
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56
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Rocaboy R, Baudoin O. 1,4-Palladium Shift/C(sp3)–H Activation Strategy for the Remote Construction of Five-Membered Rings. Org Lett 2019; 21:1434-1437. [DOI: 10.1021/acs.orglett.9b00187] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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57
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Melot R, Craveiro MV, Bürgi T, Baudoin O. Divergent Enantioselective Synthesis of (Nor)illudalane Sesquiterpenes via Pd 0-Catalyzed Asymmetric C(sp 3)-H Activation. Org Lett 2019; 21:812-815. [PMID: 30633535 DOI: 10.1021/acs.orglett.8b04086] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A divergent enantioselective synthesis of (nor)illudalane sesquiterpenes was designed by using a Pd0-catalyzed asymmetric C(sp3)-H arylation as a key step to control the isolated, highly symmetric quaternary stereocenter of the target molecules. A matched combination of chiral substrate and catalyst proved optimal to reach good levels of stereoselectivity. This approach enabled the synthesis of three (nor)illudalanes, including ( S)-deliquinone and ( S)-russujaponol F, which are synthesized for the first time in enantioenriched form.
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58
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Rocaboy R, Dailler D, Zellweger F, Neuburger M, Salomé C, Clot E, Baudoin O. Domino Pd0
-Catalyzed C(sp3
)-H Arylation/Electrocyclic Reactions via Benzazetidine Intermediates. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201807097] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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59
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Rocaboy R, Dailler D, Zellweger F, Neuburger M, Salomé C, Clot E, Baudoin O. Domino Pd0
-Catalyzed C(sp3
)-H Arylation/Electrocyclic Reactions via Benzazetidine Intermediates. Angew Chem Int Ed Engl 2018; 57:12131-12135. [DOI: 10.1002/anie.201807097] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 07/17/2018] [Indexed: 11/09/2022]
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60
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Zhang KF, Christoffel F, Baudoin O. Barbier-Negishi Coupling of Secondary Alkyl Bromides with Aryl and Alkenyl Triflates and Nonaflates. Angew Chem Int Ed Engl 2018; 57:1982-1986. [PMID: 29316142 DOI: 10.1002/anie.201711990] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Indexed: 12/14/2022]
Abstract
A mild and practical Barbier-Negishi coupling of secondary alkyl bromides with aryl and alkenyl triflates and nonaflates has been developed. This challenging reaction was enabled by the use of a very bulky imidazole-based phosphine ligand, which resulted in good yields as well as good chemo- and site selectivities for a broad range of substrates at room temperature and under non-aqueous conditions. This reaction was extended to primary alkyl bromides by using an analogous pyrazole-based ligand.
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61
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Zhang KF, Christoffel F, Baudoin O. Barbier-Negishi Coupling of Secondary Alkyl Bromides with Aryl and Alkenyl Triflates and Nonaflates. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201711990] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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62
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Rocaboy R, Dailler D, Baudoin O. A Four-Step Synthesis of (±)-γ-Lycorane via Pd0-Catalyzed Double C(sp2)–H/C(sp3)–H Arylation. Org Lett 2018; 20:772-775. [DOI: 10.1021/acs.orglett.7b03909] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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63
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Yang L, Neuburger M, Baudoin O. Chiral Bifunctional Phosphine-Carboxylate Ligands for Palladium(0)-Catalyzed Enantioselective C−H Arylation. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712061] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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64
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Yang L, Neuburger M, Baudoin O. Chiral Bifunctional Phosphine-Carboxylate Ligands for Palladium(0)-Catalyzed Enantioselective C−H Arylation. Angew Chem Int Ed Engl 2018; 57:1394-1398. [DOI: 10.1002/anie.201712061] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Indexed: 01/04/2023]
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65
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Dailler D, Rocaboy R, Baudoin O. Synthesis of β-Lactams by Palladium(0)-Catalyzed C(sp3)−H Carbamoylation. Angew Chem Int Ed Engl 2017; 56:7218-7222. [DOI: 10.1002/anie.201703109] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2017] [Revised: 04/27/2017] [Indexed: 12/29/2022]
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66
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Dailler D, Rocaboy R, Baudoin O. Synthesis of β-Lactams by Palladium(0)-Catalyzed C(sp3)−H Carbamoylation. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703109] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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67
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Abstract
The catalytic activation and functionalization of unactivated C(sp3)-H bonds of alkyl groups has undergone intense development in recent years. In particular, a variety of directing groups as well as native functional groups have been employed in combination with palladium(II) catalysis in order to perform a variety of intermolecular, and to some extent intramolecular reactions. In parallel, inspired by precedents in C(sp2)-H arylation, our group and others have developed a different approach, which is the focus of this Account. This strategy relies on the use of oxidative addition of a carbon-leaving group bond to palladium(0) to induce intramolecular C(sp3)-H activation and the subsequent formation of a C(sp2)-C(sp3) or C(sp3)-C(sp3) bond. Since our first publication in 2003, the construction of olefins and, more interestingly, of an array of valuable monocyclic and polycyclic systems has been reported according to this principle. (Hetero)aryl bromides were initially employed as reactants, but the scope was later expanded to include (hetero)aryl chlorides and triflates, alkenyl bromides, carbamoyl chlorides and α-chloroamides. Mechanistic studies enabled a better understanding of the C-H activation step, which was proposed to occur through ambiphilic metal-ligand activation-6 (AMLA-6), also known as concerted metalation deprotonation (CMD), and a better rationalization of the observed selectivity patterns. Moreover, the wealth of accumulated experimental data indicate that the number of atoms separating the C-H bond from Pd and the type of C-H bond are the main factors controlling the site-selectivity of the C-H bond cleavage. Recent efforts have been devoted to the development of enantioselective reactions. To this purpose, two different strategies have been employed: a chiral ancillary ligand in combination with an achiral base, and a chiral base in combination with an achiral ligand, and allowed for the achievement of high enantioselectivities in the construction of both tri- and tetrasubstituted stereocenters. On the other hand, the current C-H activation-based ring-forming method was applied to the synthesis of pharmacologically active substances and agrochemicals, as well as complex natural products such as the aeruginosins, thereby demonstrating its great potential for step-economical organic synthesis.
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Royal T, Baumgartner Y, Baudoin O. Enantioselective α-Arylation of O-Carbamates via Sparteine-Mediated Lithiation and Negishi Cross-Coupling. Org Lett 2017; 19:166-169. [PMID: 27995794 DOI: 10.1021/acs.orglett.6b03472] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A general and highly enantioselective arylation of carbamates derived from primary alcohols was developed by combining Hoppe's sparteine-mediated asymmetric lithiation with Negishi cross-coupling. Coupled with Aggarwal's lithiation-borylation sequence, the current method provides a short and divergent access to a variety of enantioenriched secondary and tertiary benzylic alcohols.
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69
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Baudoin O. Selectivity Control in the Palladium-catalyzed Cross-coupling of Alkyl Nucleophiles. Chimia (Aarau) 2016; 70:768-772. [DOI: 10.2533/chimia.2016.768] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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70
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Dupuy S, Zhang K, Goutierre A, Baudoin O. Terminal‐Selective Functionalization of Alkyl Chains by Regioconvergent Cross‐Coupling. Angew Chem Int Ed Engl 2016; 55:14793-14797. [DOI: 10.1002/anie.201608535] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Indexed: 01/06/2023]
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71
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Dupuy S, Zhang KF, Goutierre AS, Baudoin O. Terminal-Selective Functionalization of Alkyl Chains by Regioconvergent Cross-Coupling. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608535] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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72
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Yang L, Melot R, Neuburger M, Baudoin O. Palladium(0)-catalyzed asymmetric C(sp 3)-H arylation using a chiral binol-derived phosphate and an achiral ligand. Chem Sci 2016; 8:1344-1349. [PMID: 28451275 PMCID: PMC5360168 DOI: 10.1039/c6sc04006c] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 10/08/2016] [Indexed: 12/22/2022] Open
Abstract
High enantioselectivities can be achieved using an appropriate chiral base/achiral ligand combination in Pd0-catalyzed C(sp3)–H activation.
The first efficient palladium(0)-catalyzed enantioselective C(sp3)–H activation reaction using a catalytic chiral base and an achiral phosphine ligand is reported. Fine-tuning the binol-derived phosphoric acid pre-catalyst and the reaction conditions was found to be crucial to achieve high levels of enantioselectivity for a variety of indoline products containing both tri- and tetrasubstituted stereocenters.
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73
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Goutierre AS, Trinh HV, Larini P, Jazzar R, Baudoin O. Comparative Structural Analysis of Biarylphosphine Ligands in Arylpalladium Bromide and Malonate Complexes. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00535] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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74
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Martin A, Vors JP, Baudoin O. Synthesis of Conformationally Constrained Esters and Amines by Pd-Catalyzed α-Arylation of Hindered Substrates. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00943] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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75
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Holstein PM, Dailler D, Vantourout J, Shaya J, Millet A, Baudoin O. Synthesis of Strained γ-Lactams by Palladium(0)-Catalyzed C(sp(3) )-H Alkenylation and Application to Alkaloid Synthesis. Angew Chem Int Ed Engl 2016; 55:2805-9. [PMID: 26799445 DOI: 10.1002/anie.201511457] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Indexed: 11/10/2022]
Abstract
A variety of strained α-alkylidene-γ-lactams were synthesized by palladium(0)-catalyzed intramolecular C(sp(3) )-H alkenylation from easily accessible acyclic and monocyclic bromoalkene precursors. These lactams are valuable intermediates for accessing various classes of mono- and bicylic alkaloids containing a pyrrolidine ring, as illustrated with the synthesis of an advanced model of the marine natural product plakoridine A and of the indolizidine alkaloid δ-coniceine.
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