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Kremsmair A, Wilke HR, Harenberg JH, Bissinger BRG, Simon MM, Alandini N, Knochel P. In Situ Quench Reactions of Enantioenriched Secondary Alkyllithium Reagents in Batch and Continuous Flow Using an I/Li-Exchange. Angew Chem Int Ed Engl 2023; 62:e202214377. [PMID: 36269064 PMCID: PMC10100098 DOI: 10.1002/anie.202214377] [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: 09/29/2022] [Indexed: 12/05/2022]
Abstract
We report a practical in situ quench (ISQ) procedure involving the generation of chiral secondary alkyllithiums from secondary alkyl iodides (including functionalized iodides bearing an ester or a nitrile) in the presence of various electrophiles such as aldehydes, ketones, Weinreb amides, isocyanates, sulfides, or boronates. This ISQ-reaction allowed the preparation of a broad range of optically enriched ketones, alcohols, amides, sulfides and boronic acid esters in typically 90-98 % ee. Remarkably, these reactions were performed at -78 °C or -40 °C in batch. A continuous flow set-up permitted reaction temperatures between -20 °C and 0 °C and allowed a scale-up up to a 40-fold without further optimization.
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Affiliation(s)
- Alexander Kremsmair
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
| | - Henrik R Wilke
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
| | - Johannes H Harenberg
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
| | - Benjamin R G Bissinger
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
| | - Matthias M Simon
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
| | - Nurtalya Alandini
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
| | - Paul Knochel
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
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2
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Djukanovic D, Ganiek MA, Nishi K, Karaghiosoff K, Mashima K, Knochel P. Preparation of Functionalized Amides Using Dicarbamoylzincs. Angew Chem Int Ed Engl 2022; 61:e202205440. [PMID: 35561099 PMCID: PMC9401601 DOI: 10.1002/anie.202205440] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Indexed: 12/15/2022]
Abstract
We report a new convenient preparation of dicarbamoylzincs of type (R1R2NCO)2Zn by the treatment of ZnCl2 and formamides R1R2NCHO with LiTMP in THF (15 °C, 15 min) or by the reaction of formamides R1R2NCHO with TMP2Zn (25 °C, 16 h). This second method tolerates sensitive groups such as an ester, ketone or nitro function. Reaction of these dicarbamoylzincs with allylic, benzylic, aryl, alkenyl bromides, acid chlorides, aldehydes or enones provided various polyfunctional amides in 47–97 % yields. 13C NMR characterization of these new carbamoylzinc derivatives is reported.
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Affiliation(s)
- Dimitrije Djukanovic
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, Haus F, 81377, München, Germany
| | - Maximilian A Ganiek
- Patheon, by Thermo Fisher Scientific, Patheon Regensburg Gmbh, Donaustaufer Straße 378, 93055, Regensburg, Germany
| | - Kohei Nishi
- Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, 565-0871 Osaka, Japan.,Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, 565-0871 Osaka, Japan
| | - Konstantin Karaghiosoff
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, Haus F, 81377, München, Germany
| | - Kazushi Mashima
- Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, 565-0871 Osaka, Japan.,Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, 565-0871 Osaka, Japan
| | - Paul Knochel
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, Haus F, 81377, München, Germany
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3
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Preparation of Functionalized Amides using Dicarbamoylzincs. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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4
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Kremsmair A, Skotnitzki J, Knochel P. Diastereo- and Enantioselective Cross-Couplings of Secondary Alkylcopper Reagents with 3-Halogeno-Unsaturated Carbonyl Derivatives. Chemistry 2020; 26:11971-11973. [PMID: 32557902 PMCID: PMC7540566 DOI: 10.1002/chem.202002297] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 06/17/2020] [Indexed: 01/28/2023]
Abstract
Chiral secondary alkylcopper reagents were prepared from the corresponding alkyl iodides with retention of configuration by an I/Li-exchange using tBuLi (-100 °C, 1 min) followed by a transmetalation with CuBr⋅P(OEt)3 (-100 °C, 20 s). These stereodefined secondary alkylcoppers underwent stereoretentive cross-couplings with several 3-iodo or 3-bromo unsaturated carbonyl derivatives leading to the corresponding γ-methylated Michael acceptors in good yields and with high diastereoselectivities (dr up to 96:4). The method was extended to enantiomerically enriched alkylcoppers, providing optically enriched advanced natural product intermediates with up to 90 % ee.
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Affiliation(s)
- Alexander Kremsmair
- Department Chemie & BiochemieLudwig Maximilians-Universität MünchenButenandtstraße 5–13, Haus F81377MünchenGermany
| | - Juri Skotnitzki
- Department Chemie & BiochemieLudwig Maximilians-Universität MünchenButenandtstraße 5–13, Haus F81377MünchenGermany
| | - Paul Knochel
- Department Chemie & BiochemieLudwig Maximilians-Universität MünchenButenandtstraße 5–13, Haus F81377MünchenGermany
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5
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Han JT, Kim ST, Baik MH, Yun J. Direct Stereoconvergent Allylation of Chiral Alkylcopper Nucleophiles with Racemic Allylic Phosphates. Chemistry 2020; 26:2592-2596. [PMID: 31788874 DOI: 10.1002/chem.201905361] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Indexed: 01/14/2023]
Abstract
Copper-catalyzed stereoconvergent allylation of chiral sp3 -hybridized carbon nucleophiles with a racemic mixture of acyclic secondary allylic phosphates is reported. In the presence of a copper-catalyst complexed with chiral BenzP* ligand, tandem coupling reaction of vinyl arenes, bis(pinacolato)diboron, and racemic allylic phosphates provided β-chiral alkylboronates possessing (E)-alkenyl moiety through a direct stereoconvergent allylic coupling with concomitant generation of a C(sp3 )-stereogenic center. A range of vinyl (hetero)arenes and secondary allylic phosphates bearing 1°, 2°, 3° alkyl and phenyl α-substituents were suitable for the reaction, forming products with high enantioselectivities up to 95 % ee. Density functional theory calculations were conducted in detail to elucidate the origin of the observed regioselectivity of borylcupration and stereoconvergent (E)-olefin formation from racemic allylic phosphates.
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Affiliation(s)
- Jung Tae Han
- Department of Chemistry, Sungkyunkwan University, Suwon, 16149, Korea
| | - Seoung-Tae Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon, 34141, Korea
| | - Mu-Hyun Baik
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon, 34141, Korea
| | - Jaesook Yun
- Department of Chemistry, Sungkyunkwan University, Suwon, 16149, Korea
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Skotnitzki J, Kremsmair A, Keefer D, Gong Y, Vivie‐Riedle R, Knochel P. Stereoselektive C(sp
3
)‐C(sp
2
)‐Kreuzkupplungen von chiralen sekundären Alkylzinkreagenzien mit Alkenyl‐ und Arylhalogeniden. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201910397] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Juri Skotnitzki
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstrasse 5–13, Haus F 81377 München Deutschland
| | - Alexander Kremsmair
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstrasse 5–13, Haus F 81377 München Deutschland
| | - Daniel Keefer
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstrasse 5–13, Haus F 81377 München Deutschland
| | - Ye Gong
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstrasse 5–13, Haus F 81377 München Deutschland
| | - Regina Vivie‐Riedle
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstrasse 5–13, Haus F 81377 München Deutschland
| | - Paul Knochel
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstrasse 5–13, Haus F 81377 München Deutschland
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Skotnitzki J, Kremsmair A, Keefer D, Gong Y, de Vivie‐Riedle R, Knochel P. Stereoselective Csp 3 -Csp 2 Cross-Couplings of Chiral Secondary Alkylzinc Reagents with Alkenyl and Aryl Halides. Angew Chem Int Ed Engl 2020; 59:320-324. [PMID: 31529574 PMCID: PMC6973128 DOI: 10.1002/anie.201910397] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 09/13/2019] [Indexed: 11/10/2022]
Abstract
We report palladium-catalyzed cross-coupling reactions of chiral secondary non-stabilized dialkylzinc reagents, prepared from readily available chiral secondary alkyl iodides, with alkenyl and aryl halides. This method provides α-chiral alkenes and arenes with very high retention of configuration (dr up to 98:2) and satisfactory overall yields (up to 76 % for 3 reaction steps). The configurational stability of these chiral non-stabilized dialkylzinc reagents was determined and exceeded several hours at 25 °C. DFT calculations were performed to rationalize the stereoretention during the catalytic cycle. Furthermore, the cross-coupling reaction was applied in an efficient total synthesis of the sesquiterpenes (S)- and (R)-curcumene with control of the absolute stereochemistry.
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Affiliation(s)
- Juri Skotnitzki
- Department ChemieLudwig-Maximilians-Universität MünchenButenandtstrasse 5–13, Haus F81377MünchenGermany
| | - Alexander Kremsmair
- Department ChemieLudwig-Maximilians-Universität MünchenButenandtstrasse 5–13, Haus F81377MünchenGermany
| | - Daniel Keefer
- Department ChemieLudwig-Maximilians-Universität MünchenButenandtstrasse 5–13, Haus F81377MünchenGermany
| | - Ye Gong
- Department ChemieLudwig-Maximilians-Universität MünchenButenandtstrasse 5–13, Haus F81377MünchenGermany
| | - Regina de Vivie‐Riedle
- Department ChemieLudwig-Maximilians-Universität MünchenButenandtstrasse 5–13, Haus F81377MünchenGermany
| | - Paul Knochel
- Department ChemieLudwig-Maximilians-Universität MünchenButenandtstrasse 5–13, Haus F81377MünchenGermany
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