101
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Mose R, Jensen ME, Preegel G, Jørgensen KA. Direct Access to Multifunctionalized Norcamphor Scaffolds by Asymmetric Organocatalytic Diels-Alder Reactions. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507348] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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102
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Donslund BS, Johansen TK, Poulsen PH, Halskov KS, Jørgensen KA. Die Diarylprolinolsilylether: zehn Jahre später. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503920] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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103
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Donslund BS, Johansen TK, Poulsen PH, Halskov KS, Jørgensen KA. The Diarylprolinol Silyl Ethers: Ten Years After. Angew Chem Int Ed Engl 2015; 54:13860-74. [DOI: 10.1002/anie.201503920] [Citation(s) in RCA: 233] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 07/22/2015] [Indexed: 12/30/2022]
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104
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Naesborg L, Halskov KS, Tur F, Mønsted SMN, Jørgensen KA. Asymmetric γ-Allylation of α,β-Unsaturated Aldehydes by Combined Organocatalysis and Transition-Metal Catalysis. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504749] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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105
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Naesborg L, Halskov KS, Tur F, Mønsted SMN, Jørgensen KA. Asymmetric γ-Allylation of α,β-Unsaturated Aldehydes by Combined Organocatalysis and Transition-Metal Catalysis. Angew Chem Int Ed Engl 2015; 54:10193-7. [DOI: 10.1002/anie.201504749] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Indexed: 11/07/2022]
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106
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Sibbersen C, Lykke L, Gregersen N, Jørgensen KA, Johannsen M. A cleavable azide resin for direct click chemistry mediated enrichment of alkyne-labeled proteins. Chem Commun (Camb) 2015; 50:12098-100. [PMID: 25168178 DOI: 10.1039/c4cc05246c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The direct conjugation of a labeled proteome to a cleavable azide resin utilizing the copper-catalyzed azide alkyne cycloaddition is demonstrated. The procedure omits the classical streptavidin- and biotin-based affinity enrichment step and represents an operationally simpler, cheaper and less contaminated alternative for protein purification.
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107
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Poulsen PH, Feu KS, Paz BM, Jensen F, Jørgensen KA. Organocatalytic Asymmetric 1,6-Addition/1,4-Addition Sequence to 2,4-Dienals for the Synthesis of Chiral Chromans. Angew Chem Int Ed Engl 2015; 54:8203-7. [DOI: 10.1002/anie.201503370] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Indexed: 11/07/2022]
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108
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Poulsen PH, Feu KS, Paz BM, Jensen F, Jørgensen KA. Organocatalytic Asymmetric 1,6-Addition/1,4-Addition Sequence to 2,4-Dienals for the Synthesis of Chiral Chromans. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503370] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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109
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Donslund BS, Halskov KS, Leth LA, Paz BM, Jørgensen KA. Organocatalytic asymmetric strategies to carbocyclic structures by γ-alkylation-annulation sequences. Chem Commun (Camb) 2015; 50:13676-9. [PMID: 25247920 DOI: 10.1039/c4cc06556e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Attractive carbocyclic structures are accessed via a highly regio- and enantioselective aminocatalytic γ-addition of cyclic enals to vinyl phosphonates followed by a one-pot intramolecular Horner-Wadsworth-Emmons reaction. It is also demonstrated that nitro olefins can act as electrophiles in a similar reaction concept, providing carbocycles in equally high stereoselectivity.
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110
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Halskov KS, Kniep F, Lauridsen VH, Iversen EH, Donslund BS, Jørgensen KA. Organocatalytic enamine-activation of cyclopropanes for highly stereoselective formation of cyclobutanes. J Am Chem Soc 2015; 137:1685-91. [PMID: 25575040 DOI: 10.1021/ja512573q] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A novel organocatalytic activation mode of cyclopropanes is presented. The reaction concept is based on a design in which a reactive donor-acceptor cyclopropane intermediate is generated by in situ condensation of cyclopropylacetaldehydes with an aminocatalyst. The mechanism of this enamine-based activation of cyclopropylacetaldehydes is investigated by the application of a combined computational and experimental approach. The activation can be traced to a favorable orbital interaction between the π-orbital of the enamine and the σ*C-C orbital of the cyclopropyl ring. Furthermore, the synthetic potential of the developed system has been evaluated. By the application of a chiral secondary amine catalyst, the organocatalytically activated cyclopropanes show an unexpected and highly stereoselective formation of cyclobutanes, functionalizing at the usually inert sites of the donor-acceptor cyclopropane. By the application of 3-olefinic oxindoles and benzofuranone, biologically relevant spirocyclobutaneoxindoles and spirocyclobutanebenzofuranone can be obtained in good yields, high diastereomeric ratios, and excellent enantiomeric excesses. The mechanism of the reaction is discussed and two mechanistic proposals are presented.
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111
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Matos Paz B, Jiang H, Jørgensen KA. Aminocatalysis: Beyond Steric Shielding and Hydrogen-Bonding. Chemistry 2014; 21:1846-53. [DOI: 10.1002/chem.201405038] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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112
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Caruana L, Kniep F, Johansen TK, Poulsen PH, Jørgensen KA. A New Organocatalytic Concept for Asymmetric α-Alkylation of Aldehydes. J Am Chem Soc 2014; 136:15929-32. [DOI: 10.1021/ja510475n] [Citation(s) in RCA: 228] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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113
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Li Y, López-Delgado FJ, Jørgensen DKB, Nielsen RP, Jiang H, Jørgensen KA. Trienamine-mediated asymmetric [4+2]-cycloaddition of α,β-unsaturated ester surrogates applying 4-nitro-5-styrylisoxazoles. Chem Commun (Camb) 2014; 50:15689-91. [DOI: 10.1039/c4cc08171d] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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114
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Stiller J, Kowalczyk D, Jiang H, Jørgensen KA, Albrecht Ł. Novel Organocatalytic Activation of Unmodified Morita-Baylis-Hillman Alcohols for the Synthesis of Bicyclic α-Alkylidene-Ketones. Chemistry 2014; 20:13108-12. [DOI: 10.1002/chem.201404468] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Indexed: 12/26/2022]
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115
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Ransborg LK, Overgaard M, Hejmanowska J, Barfüsser S, Jørgensen KA, Albrecht Ł. Asymmetric formation of bridged benzoxazocines through an organocatalytic multicomponent dienamine-mediated one-pot cascade. Org Lett 2014; 16:4182-5. [PMID: 25084456 DOI: 10.1021/ol501882x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
An organocatalytic one-pot cascade leading to the stereoselective formation of novel bridged benzoxazocines is presented. The developed methodology is based on the first example of a γ-selective-Mannich-initiated cascade reaction and allows for direct annulation of the bridged benzoxazocines by incorporation of various α,β-unsaturated aldehydes, electron-rich anilines, and electron-deficient salicylaldehydes. The synthetic applicability of the products is demonstrated by relevant transformations.
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116
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Lykke L, Carlsen BD, Rambo RS, Jørgensen KA. Catalytic asymmetric synthesis of 4-nitropyrazolidines: an access to optically active 1,2,3-triamines. J Am Chem Soc 2014; 136:11296-9. [PMID: 25072940 DOI: 10.1021/ja506694v] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The first catalytic enantio- and diastereoselective synthesis of 4-nitropyrazolidines is presented. Asymmetric hydrogen-bonding activation of nitro-olefins facilitated the 1,3-dipolar cycloaddition with hydrazones, affording optically active 4-nitropyrazolidines containing three continuous stereogenic centers as a single diastereomer in up to 99% ee. Furthermore, it is demonstrated that the optically active 4-nitropyrazolidines can be applied as precursors for the synthesis of highly interesting 1,2,3-triamines.
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117
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Cruz Cruz D, Mose R, Villegas Gómez C, Torbensen SV, Larsen MS, Jørgensen KA. Organocatalytic Cascade Reactions: Towards the Diversification of Hydroisochromenes and Chromenes through Two Different Activation Modes. Chemistry 2014; 20:11331-5. [DOI: 10.1002/chem.201403505] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Indexed: 11/11/2022]
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118
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Davis RL, Stiller J, Naicker T, Jiang H, Jørgensen KA. Asymmetric organocatalytic epoxidations: reactions, scope, mechanisms, and applications. Angew Chem Int Ed Engl 2014; 53:7406-26. [PMID: 24919420 DOI: 10.1002/anie.201400241] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Indexed: 12/26/2022]
Abstract
Chiral epoxides serve as versatile building blocks in the synthesis of complex organic frameworks. The high strain imposed by the three-membered ring system makes epoxides prone to a variety of nucleophilic ring-opening reactions. Since the development of the Sharpless epoxidation, there have been many important contributions and advances in this area. With the rapid development of the field of asymmetric organocatalysis, a wide range of organocatalysts is now able to catalyze the epoxidation of broad class of unsaturated carbonyl compounds. In this Minireview, recent progress in the development of organocatalytic asymmetric epoxidation methods, the proposed mechanisms of these reactions and their applications as intermediates is reported.
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119
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Davis RL, Stiller J, Naicker T, Jiang H, Jørgensen KA. Organokatalytische asymmetrische Epoxidierungen - Reaktionen, Mechanismen und Anwendungen. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400241] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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120
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Halskov KS, Donslund BS, Barfüsser S, Jørgensen KA. Titelbild: Organocatalytic Asymmetric Formation of Steroids (Angew. Chem. 16/2014). Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201401114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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121
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Halskov KS, Donslund BS, Barfüsser S, Jørgensen KA. Cover Picture: Organocatalytic Asymmetric Formation of Steroids (Angew. Chem. Int. Ed. 16/2014). Angew Chem Int Ed Engl 2014. [DOI: 10.1002/anie.201401114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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122
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Weise CF, Lauridsen VH, Rambo RS, Iversen EH, Olsen ML, Jørgensen KA. Organocatalytic access to enantioenriched dihydropyran phosphonates via an inverse-electron-demand hetero-Diels-Alder reaction. J Org Chem 2014; 79:3537-46. [PMID: 24673394 DOI: 10.1021/jo500347a] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The enantioselective inverse-electron-demand hetero-Diels-Alder reaction of the remote olefin functionality in dienamines has been developed by the simultaneous activation of α,β-unsaturated aldehydes and acyl phosphonates. The dual activation is based on an organocatalyst that activates both the α,β-unsaturated aldehyde, through dienamine formation, and the acyl phosphonate by hydrogen-bonding. The enantioselective reaction results in the formation of dihydropyran frameworks with three contiguous stereogenic centers. Different substitution patterns are possible for both the heterodiene and the dienophile, and the target products are obtained in good yields and up to 92% ee. The potential of the reaction is demonstrated by transformation of the products into valuable and complex synthons.
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123
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Halskov KS, Donslund BS, Barfüsser S, Jørgensen KA. Organocatalytic asymmetric formation of steroids. Angew Chem Int Ed Engl 2014; 53:4137-41. [PMID: 24554381 DOI: 10.1002/anie.201400203] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Indexed: 11/11/2022]
Abstract
A novel and simple one-step approach for the construction of optically active steroids in a highly stereoselective manner by using organocatalysis is presented. The reaction of (di)enals with cyclic dienophiles in the presence of a TMS-protected prolinol catalyst leads to the construction of important 14 β-steroids. This new reaction allows an easy access to optically active steroids with a variety of substituents in the A ring in high yields and up to greater than 99 % ee. The reaction has been extended to include the construction of B- and D-homosteroids as well as steroids containing heteroatoms in the B ring. The angular substituent at C13 can be varied and alkyl, ester, and sulfone functionalities are introduced with excellent stereoselectivities. Simple synthetic procedures provide access to a range of naturally occurring steroids such as estrone and related analogues.
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124
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Halskov KS, Donslund BS, Barfüsser S, Jørgensen KA. Organocatalytic Asymmetric Formation of Steroids. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400203] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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125
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Halskov KS, Naicker T, Jensen ME, Jørgensen KA. Organocatalytic asymmetric remote aziridination of 2,4-dienals. Chem Commun (Camb) 2014; 49:6382-4. [PMID: 23748437 DOI: 10.1039/c3cc43506g] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Highly regio- and stereoselective remote aziridination of 2,4-dienals has been developed, based on a vinylogous iminium-ion-dienamine catalytic cascade reaction. Transformations of the aziridine products into enantioenriched motifs are also demonstrated. Furthermore, the reaction concept is extended to include enantioselective 1,6-addition of thiols.
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