1
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Hilton TA, Leach AG, McKay AP, Watson AJB. Accessing Rare α-Heterocyclic Aziridines via Brønsted Acid-catalyzed Michael Addition/Annulation: Scope, Limitations, and Mechanism. Chemistry 2024; 30:e202303993. [PMID: 38315627 DOI: 10.1002/chem.202303993] [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: 11/30/2023] [Revised: 02/05/2024] [Accepted: 02/05/2024] [Indexed: 02/07/2024]
Abstract
We report an approach to the diastereoselective synthesis of 1,2-disubstituted heterocyclic aziridines. A Brønsted acid-catalyzed conjugate addition of anilines to trisubstituted heterocyclic chloroalkenes provides an intermediate 1,2-chloroamine. Diastereocontrol was found to vary significantly with solvent selection, with computational modelling confirming selective, spontaneous fragmentation in the presence of trace acids, proceeding through a pseudo-cyclic, protonated intermediate and transition state. These chloroamines can then be converted to the aziridine by treatment with LiHMDS with high stereochemical fidelity. This solvent-induced stereochemical enrichment thereby enables an efficient route to rare cis-aziridines with high dr. The scope, limitations, and mechanistic origins of selectivity are also presented.
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Affiliation(s)
- Timothy A Hilton
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9ST, U.K
| | - Andrew G Leach
- School of Health Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
| | - Aidan P McKay
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9ST, U.K
| | - Allan J B Watson
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9ST, U.K
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2
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Moore LC, Lo A, Fell JS, Duong MR, Moreno JA, Rich BE, Bravo M, Fettinger JC, Souza LW, Olmstead MM, Houk KN, Shaw JT. Acyclic Stereocontrol in the Additions of Nucleophilic Alkenes to α‐Chiral
N
‐Sulfonyl Imines. Chemistry 2019; 25:12214-12220. [DOI: 10.1002/chem.201902790] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Lucas C. Moore
- Department of Chemistry and Biochemistry University of California One Shields Ave. Davis CA 95616 USA
| | - Anna Lo
- Department of Chemistry and Biochemistry University of California One Shields Ave. Davis CA 95616 USA
| | - Jason S. Fell
- Department of Chemistry University of California, Los Angeles 607 Charles E. Young Drive East Los Angeles CA 90095-1569 USA
| | - Matthew R. Duong
- Department of Chemistry and Biochemistry University of California One Shields Ave. Davis CA 95616 USA
| | - Jose A. Moreno
- Department of Chemistry and Biochemistry University of California One Shields Ave. Davis CA 95616 USA
| | - Barry E. Rich
- Department of Chemistry and Biochemistry University of California One Shields Ave. Davis CA 95616 USA
| | - Martin Bravo
- Department of Chemistry and Biochemistry University of California One Shields Ave. Davis CA 95616 USA
| | - James C. Fettinger
- Department of Chemistry and Biochemistry University of California One Shields Ave. Davis CA 95616 USA
| | - Lucas W. Souza
- Department of Chemistry and Biochemistry University of California One Shields Ave. Davis CA 95616 USA
| | - Marilyn M. Olmstead
- Department of Chemistry and Biochemistry University of California One Shields Ave. Davis CA 95616 USA
| | - Kendall N. Houk
- Department of Chemistry University of California, Los Angeles 607 Charles E. Young Drive East Los Angeles CA 90095-1569 USA
| | - Jared T. Shaw
- Department of Chemistry and Biochemistry University of California One Shields Ave. Davis CA 95616 USA
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3
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Marcantoni E, Palmieri A, Petrini M. Recent synthetic applications of α-amido sulfones as precursors of N-acylimino derivatives. Org Chem Front 2019. [DOI: 10.1039/c9qo00196d] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
α-Amido sulfones can be directly used as N-acylimine or N-acyliminium ion precursors in several synthetic processes aimed at the preparation of nitrogen containing compounds. This review collects the most relevant and practical utilizations of α-amido sulfones appeared in the literature after 2005.
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Affiliation(s)
- Enrico Marcantoni
- School of Science and Technology
- Chemistry Division
- University of Camerino
- 1 I-62032 Camerino
- Italy
| | - Alessandro Palmieri
- School of Science and Technology
- Chemistry Division
- University of Camerino
- 1 I-62032 Camerino
- Italy
| | - Marino Petrini
- School of Science and Technology
- Chemistry Division
- University of Camerino
- 1 I-62032 Camerino
- Italy
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4
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Song X, Xu C, Du D, Zhao Z, Zhu D, Wang M. Ring-Opening Diarylation of Siloxydifluorocyclopropanes by Ag(I) Catalysis: Stereoselective Construction of 2-Fluoroallylic Scaffold. Org Lett 2017; 19:6542-6545. [DOI: 10.1021/acs.orglett.7b03254] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiaoning Song
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Cong Xu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Dongxu Du
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Ziming Zhao
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Dongsheng Zhu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Mang Wang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
- State
Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
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5
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Fan X, Walsh PJ. Chelation-Controlled Additions to Chiral α- and β-Silyloxy, α-Halo, and β-Vinyl Carbonyl Compounds. Acc Chem Res 2017; 50:2389-2400. [PMID: 28809470 DOI: 10.1021/acs.accounts.7b00319] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The science and art of preventing and managing disease and prolonging life is dependent on advances in medicine, biology, and biochemistry. Many of these advances will involve interactions of small molecules with biological entities. As such, they will rely on the efficient synthesis of active compounds with very high stereochemical purity. Although enantioselective reactions are important in this regard, most stereocenters in complex molecule synthesis are installed in diastereoselective reactions. Perhaps the most well-known diastereoselective C-C bond-forming reaction is the addition of nucleophiles to carbonyl groups with α- or β-stereogenic centers. Diastereoselective additions of organometallic reagents to protected chiral α- and β-hydroxy aldehydes and ketones are described by either Cram chelation or Felkin-Anh models, which are protecting group (PG)-dependent. Small PGs (X = OMOM, OBn, etc.) favor Cram chelation, wherein both the carbonyl group and the O-PG bind to the Lewis acidic metal, providing syn diol motifs. In contrast, silyl PGs, with the OSiR3 moiety being both bulky and weakly coordinating, provide anti diols (Felkin addition). It is well-known that exceptions to this paradigm are scarce. Therefore, the choice of PG is based on the desired stereochemical outcome in the addition step and is often inappropriate for the global protection strategy. Thus, it is critical to develop general methods for chelation-controlled additions of organometallics to chiral silyloxy aldehydes and ketones. Once the challenge of developing chelation-controlled additions to silyloxy carbonyl compounds can be met, the next question is what other pendant functional groups can chelate? Herein we introduce the first general methods for the chelation-controlled addition of organometallics to chiral silyloxy aldehydes and ketones. A wide variety of organozinc reagents have been used in these addition reactions, including dialkylzinc reagents that are commercially available or generated using Knochel's methods. Existing protocols for the generation of (E)-di- and -trisubstituted vinylzinc reagents have been employed, and new methods for the generation of (Z)-di- and -trisubstituted vinylzinc reagents have been developed. The generation of 1,1-heterobimetallic reagents based on boron and zinc has been advanced, and the addition of these reagents to silyloxy aldehydes via chelation-control is included. We will first describe the initial discovery and a model to explain the observed diastereoselectivities. A wide array of chelation-controlled additions to chiral α- and β-silyloxy aldehydes and ketones will then be presented. We next describe other functional groups that undergo chelation-controlled additions. α-Halo aldehyde derivatives are well-known to favor Felkin addition (via the Cornforth-Evans model). We introduce a general method for chelation-controlled additions to α-halo aldimines that provides useful precursors to aziridines. Finally, we provide preliminary evidence that even C═C bonds can play the role of chelating groups in additions to β,γ-unsaturated ketones. The results outlined in this Account redefine the commonly held idea that chiral silyloxy- and halo-substituted carbonyl compounds only give Felkin addition products. The key to achieving chelation control in these reactions is the use of weakly coordinating solvents (dichloromethane and toluene) that do not readily bind to the zinc Lewis acids RZnX.
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Affiliation(s)
- Xinyuan Fan
- Institute
of Advanced Synthesis, School of Chemistry and Molecular Engineering,
Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Patrick J. Walsh
- Institute
of Advanced Synthesis, School of Chemistry and Molecular Engineering,
Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P. R. China
- Roy
and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
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6
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Hua Y, Asgari P, Avullala T, Jeon J. Catalytic Reductive ortho-C-H Silylation of Phenols with Traceless, Versatile Acetal Directing Groups and Synthetic Applications of Dioxasilines. J Am Chem Soc 2016; 138:7982-91. [PMID: 27265033 PMCID: PMC5103641 DOI: 10.1021/jacs.6b04018] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new, highly selective, bond functionalization strategy, achieved via relay of two transition metal catalysts and the use of traceless acetal directing groups, has been employed to provide facile formation of C-Si bonds and concomitant functionalization of a silicon group in a single vessel. Specifically, this approach involves the relay of Ir-catalyzed hydrosilylation of inexpensive and readily available phenyl acetates, exploiting disubstituted silyl synthons to afford silyl acetals and Rh-catalyzed ortho-C-H silylation to provide dioxasilines. A subsequent nucleophilic addition to silicon removes the acetal directing groups and directly provides unmasked phenol products and, thus, useful functional groups at silicon achieved in a single vessel. This traceless acetal directing group strategy for catalytic ortho-C-H silylation of phenols was also successfully applied to preparation of multisubstituted arenes. Remarkably, a new formal α-chloroacetyl directing group has been developed that allows catalytic reductive C-H silylation of sterically hindered phenols. In particular, this new method permits access to highly versatile and nicely differentiated 1,2,3-trisubstituted arenes that are difficult to access by other catalytic routes. In addition, the resulting dioxasilines can serve as chromatographically stable halosilane equivalents, which allow not only removal of acetal directing groups but also introduce useful functional groups leading to silicon-bridged biaryls. We demonstrated that this catalytic C-H bond silylation strategy has powerful synthetic potential by creating direct applications of dioxasilines to other important transformations, examples of which include aryne chemistry, Au-catalyzed direct arylation, sequential orthogonal cross-couplings, and late-stage silylation of phenolic bioactive molecules and BINOL scaffolds.
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Affiliation(s)
| | | | - Thirupataiah Avullala
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Junha Jeon
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
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7
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Brawley KK, Davis TA. Lewis base catalyzed trialkylsilylcyanide additions to cyclic 2-fluoroketones: nucleophile directed access to both cis- and trans-stereoisomers. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.03.112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Trost BM, Biannic B, Brindle CS, O'Keefe BM, Hunter TJ, Ngai MY. A Highly Convergent Total Synthesis of Leustroducsin B. J Am Chem Soc 2015; 137:11594-7. [PMID: 26313159 PMCID: PMC4621997 DOI: 10.1021/jacs.5b07438] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Leustroducsin
B exhibits a large variety of biological activities
and unique structural features. An efficient and highly convergent
total synthesis of Leustroducsin B was achieved in 17 longest linear
and 39 total steps by disconnecting the molecule into three fragments
having similar levels of complexity. These pieces were connected via
a highly efficient chelate-controlled addition of a vinyl zincate
to an α-hydroxy ketone and a silicon-mediated cross-coupling.
The stereochemistry of the central and western fragments was set catalytically
in high yields and excellent de by a zinc-ProPhenol-catalyzed aldol
reaction and a palladium-catalyzed asymmetric allylic alkylation.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University , Stanford, California 94305-5580, United States
| | - Berenger Biannic
- Department of Chemistry, Stanford University , Stanford, California 94305-5580, United States
| | - Cheyenne S Brindle
- Department of Chemistry, Stanford University , Stanford, California 94305-5580, United States
| | - B Michael O'Keefe
- Department of Chemistry, Stanford University , Stanford, California 94305-5580, United States
| | - Thomas J Hunter
- Department of Chemistry, Stanford University , Stanford, California 94305-5580, United States
| | - Ming-Yu Ngai
- Department of Chemistry, Stanford University , Stanford, California 94305-5580, United States
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9
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Vabre R, Island B, Diehl CJ, Schreiner PR, Marek I. Forming Stereogenic Centers in Acyclic Systems from Alkynes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504756] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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10
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Vabre R, Island B, Diehl CJ, Schreiner PR, Marek I. Forming Stereogenic Centers in Acyclic Systems from Alkynes. Angew Chem Int Ed Engl 2015; 54:9996-9. [DOI: 10.1002/anie.201504756] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Indexed: 12/15/2022]
Affiliation(s)
- Roxane Vabre
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry and Lise Meitner‐Minerva Center for Computational Quantum Chemistry, Technion‐Israel Institute of Technology, Technion City, Haifa 32000 (Israel)
| | - Biana Island
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry and Lise Meitner‐Minerva Center for Computational Quantum Chemistry, Technion‐Israel Institute of Technology, Technion City, Haifa 32000 (Israel)
| | - Claudia J. Diehl
- Institute of Organic Chemistry, Justus‐Liebig University, Heinrich‐Buff‐Ring 58, 35392 Giessen (Germany)
| | - Peter R. Schreiner
- Institute of Organic Chemistry, Justus‐Liebig University, Heinrich‐Buff‐Ring 58, 35392 Giessen (Germany)
| | - Ilan Marek
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry and Lise Meitner‐Minerva Center for Computational Quantum Chemistry, Technion‐Israel Institute of Technology, Technion City, Haifa 32000 (Israel)
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11
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12
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Guang J, Larson AJ, Zhao JCG. Stereoselective Mannich Reaction ofS-Phenyl Thioesters Catalyzed by Bifunctional Organocatalysts. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400735] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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13
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Affiliation(s)
- Robert E. Rosenberg
- Transylvania University; Department of Chemistry; 300 North Broadway Lexington KY 40508 USA
| | - W. Jonathan Kelly
- Transylvania University; Department of Chemistry; 300 North Broadway Lexington KY 40508 USA
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14
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Raffier L, Gutierrez O, Stanton GR, Kozlowski MC, Walsh PJ. Alkenes as Chelating Groups in Diastereoselective Additions of Organometallics to Ketones. Organometallics 2014; 33:5371-5377. [PMID: 25328269 PMCID: PMC4195513 DOI: 10.1021/om5007006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Indexed: 11/30/2022]
Abstract
![]()
Alkenes have been discovered to be
chelating groups to Zn(II),
enforcing highly stereoselective additions of organozincs to β,γ-unsaturated
ketones. 1H NMR studies and DFT calculations provide support
for this surprising chelation mode. The results expand the range of
coordinating groups for chelation-controlled carbonyl additions from
heteroatom Lewis bases to simple C–C double bonds, broadening
the 60 year old paradigm.
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Affiliation(s)
- Ludovic Raffier
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Osvaldo Gutierrez
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Gretchen R Stanton
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Marisa C Kozlowski
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Patrick J Walsh
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
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15
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Patrick J. Walsh. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/anie.201405235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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16
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Patrick J. Walsh. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Lhermet R, Ahmad M, Fressigné C, Silvi B, Durandetti M, Maddaluno J. Carbolithiation of Chloro-Substituted Alkynes: A New Access to Vinyl Carbenoids. Chemistry 2014; 20:10249-54. [DOI: 10.1002/chem.201403605] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Indexed: 11/10/2022]
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18
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Affiliation(s)
- Hiroaki Ohno
- Graduate
School of Pharmaceutical
Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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19
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Zhang X, Qiu Y, Fu C, Ma S. Highly selective 4-alkynoic acids synthesis via iron-mediated complete inversion of stereogenic carbon centers. Org Chem Front 2014. [DOI: 10.1039/c3qo00066d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Callebaut G, Colpaert F, Nonn M, Kiss L, Sillanpää R, Törnroos KW, Fülöp F, De Kimpe N, Mangelinckx S. Asymmetric synthesis of chloroisothreonine derivatives via syn-stereoselective Mannich-type additions across N-sulfinyl-α-chloroimines. Org Biomol Chem 2014; 12:3393-405. [DOI: 10.1039/c4ob00243a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Mannich-type reactions across N-sulfinyl-α-chloroaldimines resulted in syn-stereoselective synthesis of chloroisothreonine derivatives as excellent building blocks.
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Affiliation(s)
- Gert Callebaut
- Department of Sustainable Organic Chemistry and Technology
- Faculty of Bioscience Engineering
- Ghent University
- B-9000 Ghent, Belgium
| | - Filip Colpaert
- Department of Sustainable Organic Chemistry and Technology
- Faculty of Bioscience Engineering
- Ghent University
- B-9000 Ghent, Belgium
| | - Melinda Nonn
- Institute of Pharmaceutical Chemistry and Stereochemistry Research Group of the Hungarian Academy of Sciences
- Szeged, Eötvös u. 6, Hungary
| | - Loránd Kiss
- Institute of Pharmaceutical Chemistry and Stereochemistry Research Group of the Hungarian Academy of Sciences
- Szeged, Eötvös u. 6, Hungary
| | - Reijo Sillanpää
- Department of Chemistry
- University of Jyväskylä
- Fin-40351 Jyväskylä, Finland
| | - Karl W. Törnroos
- Department of Chemistry
- University of Bergen
- N-5007 Bergen, Norway
| | - Ferenc Fülöp
- Institute of Pharmaceutical Chemistry and Stereochemistry Research Group of the Hungarian Academy of Sciences
- Szeged, Eötvös u. 6, Hungary
| | - Norbert De Kimpe
- Department of Sustainable Organic Chemistry and Technology
- Faculty of Bioscience Engineering
- Ghent University
- B-9000 Ghent, Belgium
| | - Sven Mangelinckx
- Department of Sustainable Organic Chemistry and Technology
- Faculty of Bioscience Engineering
- Ghent University
- B-9000 Ghent, Belgium
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21
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Raffier L, Stanton GR, Walsh PJ. Chelation-controlled additions to α-silyloxy aldehydes: an autocatalytic approach. Org Lett 2013; 15:6174-7. [PMID: 24252100 DOI: 10.1021/ol4030259] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The Felkin-Anh model has been widely accepted to describe stereochemical outcomes in nucleophilic additions to α-silyloxy carbonyl compounds. Herein, it is demonstrated that chelation-controlled additions can be performed using dialkylzinc reagents in the presence of chlorotrimethylsilane with good to excellent diastereoselectivities. Ethyl zinc chloride, the Lewis acid responsible for promoting chelation, is generated in situ in an autocatalytic fashion. This approach circumvents its use in stoichiometric amounts.
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Affiliation(s)
- Ludovic Raffier
- P. Roy and Diana T. Vagelos Laboratories, University of Pennsylvania , Department of Chemistry, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
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22
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Yang F, Feng L, Wang N, Liu X, Li J, Shen Y. Practical synthesis of C1–8 fragment of autolytimycin via a chelation-controlled diastereoselective addition of diisopropenylzinc to α-methoxy aldehyde. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.08.067] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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23
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Malakar CC, Stas S, Herrebout W, Abbaspour Tehrani K. Lewis Acid Mediated Vinyl-Transfer Reaction of Alkynes toN-Alkylimines by Using theN-Alkyl Residue as a Sacrificial Hydrogen Donor. Chemistry 2013; 19:14263-70. [DOI: 10.1002/chem.201300469] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Indexed: 11/10/2022]
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24
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Yang Y, Moschetta EG, Rioux RM. Addition of Sulfonic Acids to Terminal Alkynes Catalyzed by a Rhodium Complex: Ligand Concentration-Controlled Reaction Selectivity. ChemCatChem 2013. [DOI: 10.1002/cctc.201300228] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Zong H, Huang H, Bian G, Song L. Synergistic effect of achiral quaternary ammonium salt on asymmetric additions of diethylzinc to aldehydes. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.03.066] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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26
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Stanton GR, Göllü M, Platoff RM, Rich CE, Carroll PJ, Walsh PJ. Synthesis of ChiralN-Sulfonyl andN-Phosphinoyl α-Halo Aldimine Precursors. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201200864] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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