1
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Hu T, Zhang Y, Wang W, Li Q, Huang L, Gao J, Kuang Y, Zhao C, Zhou S, Gao L, Su Z, Song Z. Lewis Base-Catalyzed Dynamic Kinetic Asymmetric Transformation of Racemic Chlorosilanes en Route to Si-Stereogenic Silylethers. J Am Chem Soc 2024; 146:23092-23102. [PMID: 39108025 DOI: 10.1021/jacs.4c04390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/22/2024]
Abstract
Enantiopure Si-stereogenic organosilanes are highly valued in the fields of organic synthesis, development of advanced materials, and drug discovery. However, they are not naturally occurring, and their synthesis has been largely confined to resolution of racemic silanes or desymmetrization of symmetric silanes. In contrast, the dynamic kinetic asymmetric transformation (DYKAT) of racemic organosilanes offers a mechanistically distinct approach and would broaden the accessibility of Si-stereogenic silanes in an enantioconvergent manner. In this study, we report a Lewis base-catalyzed DYKAT of racemic chlorosilanes. The chiral isothiourea catalyst, (S)-benzotetramisole, facilitates silyletherification with phenols, yielding (R)-silylethers in good yields with high enantioselectivity (27 examples, up to 86% yield, up to 98:2 er). Kinetic analysis, control experiments, and DFT calculations suggest that a two-catalyst-bound pentacoordinate silicate is responsible for the Si-configurational epimerization of the ion-paired tetracoordinated silicon intermediates.
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Affiliation(s)
- Tianbao Hu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Yan Zhang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Wanshu Wang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China
| | - Qin Li
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Liying Huang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Jiahui Gao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Yuzhong Kuang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Chen Zhao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Song Zhou
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Lu Gao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Zhishan Su
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Zhenlei Song
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
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2
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Gong Z, Smith A, Farah AO, Dickerson SD, González-Montiel GA, Laddusaw JM, Cheong PHY, Wiskur SL. Investigating Substituent Interactions with Cationic Catalysts. J Org Chem 2023. [PMID: 37993265 DOI: 10.1021/acs.joc.3c01721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2023]
Abstract
Rates of isothiourea catalyzed silylation and acylation reactions were measured for substrates with various electronic substituents at the aryl group. Through these measurements, the intermolecular interactions between cationic catalyst intermediates and different aryl groups were explored. These studies were performed to understand how changes in the catalyst structure affected electrostatic intermolecular interactions. Three different catalysts (N-methylimidazole and two isothioureas) were employed that varied in their ability to delocalize their cationic nature. The results show that more delocalization on the catalyst reduces the sensitivity to the electronics on the aryl group. Surprisingly, the isothiourea with a fused benzene ring provided additional points of interaction with groups that contained lone-pairs, significantly affecting the overall rate. This work helps explore the interactions that dominate in these types of catalytic systems, to aid in future organocatalysis development. Density functional theory (DFT) studies further confirmed isothiourea/aryl ring interaction with the alcohol substrate in the acylation process, which confirmed these hypotheses. Electron rich or lone-pair bearing functional groups stabilize the cationic catalyst core, thereby stabilizing the transition states and accelerating the reaction. It was also discovered that in one case, the formation of a stable substrate dimer was responsible for its lower reactivity.
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Affiliation(s)
- Ziyuan Gong
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, GSRC 109, Columbia, South Carolina 29206, United States
| | - Alberto Smith
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, GSRC 109, Columbia, South Carolina 29206, United States
| | - Abdikani Omar Farah
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, Oregon 97331, United States
| | - Shelby D Dickerson
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, GSRC 109, Columbia, South Carolina 29206, United States
| | - Gisela A González-Montiel
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, Oregon 97331, United States
| | - Jacqueline M Laddusaw
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, Oregon 97331, United States
| | - Paul Ha-Yeon Cheong
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, Oregon 97331, United States
| | - Sheryl L Wiskur
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, GSRC 109, Columbia, South Carolina 29206, United States
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3
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Thangsan P, Rukkijakan T, Thanaussavadate B, Yiamsawat K, Sirijaraensre J, Gable KP, Chuawong P. Quantitative analysis of steric effects on the regioselectivity of the Larock heteroannulation reaction. Org Biomol Chem 2023; 21:1501-1513. [PMID: 36688538 DOI: 10.1039/d2ob02089k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Alkylphenylacetylene derivatives were synthesized and used as reactants in the Larock heteroannulation reaction to investigate the steric influence on regioselectivity. Large alkyl groups preferentially yielded 2-alkyl-3-phenylindole products, while smaller alkyl groups provided 3-alkyl-2-phenylindole as major products. The logarithm of regioisomeric product ratios exhibited good correlations with various steric parameters. Notably, the Charton values provided the best correlation when excluding the cyclopropyl group. In addition, the Boltzmann-weighted Sterimol parameter (wSterimol) was utilized to generate a good predictive model, indicating the B1 wSterimol as the significant regiochemical determining parameter with no obvious deviation for the cyclopropyl group. Relative atomic distances within the DFT-optimized transition state structures revealed good correlations with the logarithm of regioisomeric ratios. Furthermore, the cyclopropyl adsorption complex indicated electronic contribution, explaining the peculiar behavior of this substituent in the experimental observation.
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Affiliation(s)
- Poomsith Thangsan
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Special Research Unit for Advanced Magnetic Resonance (AMR), Kasetsart University, Bangkok 10900, Thailand.
| | - Thanya Rukkijakan
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Special Research Unit for Advanced Magnetic Resonance (AMR), Kasetsart University, Bangkok 10900, Thailand.
| | - Bongkotrat Thanaussavadate
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Special Research Unit for Advanced Magnetic Resonance (AMR), Kasetsart University, Bangkok 10900, Thailand.
| | - Kanyapat Yiamsawat
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Special Research Unit for Advanced Magnetic Resonance (AMR), Kasetsart University, Bangkok 10900, Thailand.
| | - Jakkapan Sirijaraensre
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
| | - Kevin P Gable
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, Oregon 97331-4003, USA
| | - Pitak Chuawong
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Special Research Unit for Advanced Magnetic Resonance (AMR), Kasetsart University, Bangkok 10900, Thailand.
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4
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Lustosa DM, Milo A. Mechanistic Inference from Statistical Models at Different Data-Size Regimes. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Danilo M. Lustosa
- Department of Chemistry, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Anat Milo
- Department of Chemistry, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
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5
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Yu X. Support Vector Machine‐Based Prediction of Enantioselectivity in Fluorination of Allylic Alcohols. ChemistrySelect 2022. [DOI: 10.1002/slct.202104369] [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]
Affiliation(s)
- Xinliang Yu
- Hunan Provincial Key Laboratory of Environmental Catalysis & Waste Regeneration College of Materials and Chemical Engineering Hunan Institute of Engineering Xiangtan Hunan 411104 China
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6
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Kawamura KE, Chang ASM, Martin DJ, Smith HM, Morris PT, Cook AK. Modular Ni(0)/Silane Catalytic System for the Isomerization of Alkenes. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00010] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Kiana E. Kawamura
- Department of Chemistry and Biochemistry, University of Oregon, 1585 13th Avenue, Eugene, Oregon 97403, United States
| | - Alison Sy-min Chang
- Department of Chemistry and Biochemistry, University of Oregon, 1585 13th Avenue, Eugene, Oregon 97403, United States
| | - Daryl J. Martin
- Department of Chemistry and Biochemistry, University of Oregon, 1585 13th Avenue, Eugene, Oregon 97403, United States
| | - Haley M. Smith
- Department of Chemistry and Biochemistry, University of Oregon, 1585 13th Avenue, Eugene, Oregon 97403, United States
| | - Parker T. Morris
- Department of Chemistry and Biochemistry, University of Oregon, 1585 13th Avenue, Eugene, Oregon 97403, United States
| | - Amanda K. Cook
- Department of Chemistry and Biochemistry, University of Oregon, 1585 13th Avenue, Eugene, Oregon 97403, United States
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7
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Redden BK, Clark RW, Gong Z, Rahman MM, Peryshkov DV, Wiskur SL. Mechanistic investigations of alcohol silylation with isothiourea catalysts. Org Biomol Chem 2021; 19:10181-10188. [PMID: 34787145 DOI: 10.1039/d1ob01732b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanism of the asymmetric silylation of alcohols with isothiourea catalysts was studied by employing reaction progress kinetic analysis. These reactions were developed by the Wiskur group, and use triphenyl silyl chloride and chiral isothiourea catalysts to silylate the alcohols. While the order of most reaction components was as expected (catalyst, amine base, alcohol), the silyl chloride was determined to be a higher order. This suggested a multistep mechanism between the catalyst and silyl chloride, with the second equivalent of silyl chloride assisting in the formation of the reactive intermediate leading to the rate-determining step. Through the addition of additives and investigating changes in the silyl chloride, an understanding of the catalyst equilibrium emerged for this reaction and provided pathways for further reaction development.
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Affiliation(s)
- Brandon K Redden
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter St., Columbia, SC 29208, USA.
| | - Robert W Clark
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter St., Columbia, SC 29208, USA.
| | - Ziyuan Gong
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter St., Columbia, SC 29208, USA.
| | - Md Mamdudur Rahman
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter St., Columbia, SC 29208, USA.
| | - Dmitry V Peryshkov
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter St., Columbia, SC 29208, USA.
| | - Sheryl L Wiskur
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter St., Columbia, SC 29208, USA.
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8
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Suzuki T, Iwakura M, Nakata K. Highly Efficient Silylative Kinetic Resolution of Racemic
trans
‐2‐Alkyl‐1‐indanols Catalyzed by Chiral Guanidine. ChemistrySelect 2021. [DOI: 10.1002/slct.202103341] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takeshi Suzuki
- Department of Chemistry Graduate School of Natural Science and Technology Shimane University 1060 Nishikawatsu Matsue Shimane 690-8504 Japan
| | - Manaya Iwakura
- Department of Chemistry Graduate School of Natural Science and Technology Shimane University 1060 Nishikawatsu Matsue Shimane 690-8504 Japan
| | - Kenya Nakata
- Department of Chemistry Graduate School of Natural Science and Technology Shimane University 1060 Nishikawatsu Matsue Shimane 690-8504 Japan
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9
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Komine N, Mitsui T, Kikuchi S, Hirano M. Ligand-Controlled Regiodivergent Hydrosilylation of Conjugated Dienes Catalyzed by Mono(phosphine)palladium(0) Complexes. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00597] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Nobuyuki Komine
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Tatsuo Mitsui
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Shu Kikuchi
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Masafumi Hirano
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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10
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Hamid A, Roy RK. Validation of Hammett’s Linear Free Energy Relationship Through an Unconventional Approach. J Phys Chem A 2020; 124:5775-5783. [DOI: 10.1021/acs.jpca.9b10665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aabid Hamid
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333031, Rajasthan, India
| | - Ram Kinkar Roy
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333031, Rajasthan, India
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11
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Zahrt AF, Athavale SV, Denmark SE. Quantitative Structure-Selectivity Relationships in Enantioselective Catalysis: Past, Present, and Future. Chem Rev 2020; 120:1620-1689. [PMID: 31886649 PMCID: PMC7018559 DOI: 10.1021/acs.chemrev.9b00425] [Citation(s) in RCA: 90] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The dawn of the 21st century has brought with it a surge of research related to computer-guided approaches to catalyst design. In the past two decades, chemoinformatics, the application of informatics to solve problems in chemistry, has increasingly influenced prediction of activity and mechanistic investigations of organic reactions. The advent of advanced statistical and machine learning methods, as well as dramatic increases in computational speed and memory, has contributed to this emerging field of study. This review summarizes strategies to employ quantitative structure-selectivity relationships (QSSR) in asymmetric catalytic reactions. The coverage is structured by initially introducing the basic features of these methods. Subsequent topics are discussed according to increasing complexity of molecular representations. As the most applied subfield of QSSR in enantioselective catalysis, the application of local parametrization approaches and linear free energy relationships (LFERs) along with multivariate modeling techniques is described first. This section is followed by a description of global parametrization methods, the first of which is continuous chirality measures (CCM) because it is a single parameter derived from the global structure of a molecule. Chirality codes, global, multivariate descriptors, are then introduced followed by molecular interaction fields (MIFs), a global descriptor class that typically has the highest dimensionality. To highlight the current reach of QSSR in enantioselective transformations, a comprehensive collection of examples is presented. When combined with traditional experimental approaches, chemoinformatics holds great promise to predict new catalyst structures, rationalize mechanistic behavior, and profoundly change the way chemists discover and optimize reactions.
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Affiliation(s)
- Andrew F. Zahrt
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, IL 61801
| | - Soumitra V. Athavale
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, IL 61801
| | - Scott E. Denmark
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, IL 61801
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12
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Wang C, Li SJ, Zhang M, Wei D, Ding L. Origin of stereoselectivity in an isothiourea catalyzed Michael addition reaction of aryl ester with vinyl disulfone. NEW J CHEM 2020. [DOI: 10.1039/d0nj03540h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The origin of stereoselectivity in an isothiourea-catalyzed addition reaction of aryl ester with vinyl disulfone was explored for the first time.
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Affiliation(s)
- Congcong Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province
- Key Laboratory of Technology of Drug Preparation (Zhengzhou University)
- Ministry of Education of China
- Key Laboratory of Henan Province for Drug Quality and Evaluation, School of Pharmaceutical Sciences
- Zhengzhou University
| | - Shi-Jun Li
- College of Chemistry, and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Min Zhang
- College of Chemistry, and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Donghui Wei
- College of Chemistry, and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Lina Ding
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province
- Key Laboratory of Technology of Drug Preparation (Zhengzhou University)
- Ministry of Education of China
- Key Laboratory of Henan Province for Drug Quality and Evaluation, School of Pharmaceutical Sciences
- Zhengzhou University
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13
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Zhang T, Dickerson SD, Zhu T, Tang C, Wiskur SL. Polymer compositions on kinetic resolution of secondary alcohols using polymer-supported silyl chlorides. Polym Chem 2020. [DOI: 10.1039/d0py00747a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Modulating the polarity of the polymer backbone affects the selectivity of asymmetric silylation.
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Affiliation(s)
- Tian Zhang
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
| | - Shelby D. Dickerson
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
| | - Tianyu Zhu
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
| | - Chuanbing Tang
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
| | - Sheryl L. Wiskur
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
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14
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Yoshimatsu S, Nakata K. Silylative Kinetic Resolution of Racemic 2,2‐Dialkyl 5‐ and 6‐Membered Cyclic Benzylic Alcohol Derivatives Catalyzed by Chiral Guanidine, (
R
)‐
N
‐Methylbenzoguanidine. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900761] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shuhei Yoshimatsu
- Department of Chemistry, Graduate School of Natural Science and TechnologyShimane University 1060 Nishikawatsu Matsue Shimane 690-8504 Japan
| | - Kenya Nakata
- Department of Chemistry, Graduate School of Natural Science and TechnologyShimane University 1060 Nishikawatsu Matsue Shimane 690-8504 Japan
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15
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Bulandr JJ, Grabowski JP, Law CM, Shaw JL, Goodell JR, Mitchell TA. Investigation of Transfer Group, Tether Proximity, and Alkene Substitution for Intramolecular Silyloxypyrone-Based [5 + 2] Cycloadditions. J Org Chem 2019; 84:10306-10320. [PMID: 31322900 DOI: 10.1021/acs.joc.9b01479] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Systematic investigation of intramolecular silyloxypyrone-based [5 + 2] cycloadditions revealed three significant factors impacting conversion to cycloadduct: (1) the silyl transfer group has a substantial influence on the rate of reaction, and the robust t-butyldiphenylsilyl group was found to be more effective overall than the conventional t-butyldimethylsilyl group; (2) α,β-unsaturated esters were generally more reactive than terminal olefins and afforded appreciable quantity of cycloadduct even at room temperature; and (3) the proximity of the tether to the silyl transfer group revealed a critical alignment trend between the pyrone and the alkene. Taken together, these investigations provided insight regarding the steric and electronic parameters that impact the scope and limitation of these reactions.
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Affiliation(s)
- Jacob J Bulandr
- Department of Chemistry , Illinois State University , Campus Box 4160, Normal , Illinois 61790-4160 , United States
| | - Jacob P Grabowski
- Department of Chemistry , Illinois State University , Campus Box 4160, Normal , Illinois 61790-4160 , United States
| | - Chunyin M Law
- Department of Chemistry , Illinois State University , Campus Box 4160, Normal , Illinois 61790-4160 , United States
| | - Jessica L Shaw
- Department of Chemistry , Illinois State University , Campus Box 4160, Normal , Illinois 61790-4160 , United States
| | - John R Goodell
- Department of Chemistry , Illinois State University , Campus Box 4160, Normal , Illinois 61790-4160 , United States
| | - T Andrew Mitchell
- Department of Chemistry , Illinois State University , Campus Box 4160, Normal , Illinois 61790-4160 , United States
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16
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Zhang T, Redden BK, Wiskur SL. Investigation of Electrostatic Interactions towards Controlling Silylation-Based Kinetic Resolutions. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900754] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Tian Zhang
- Department of Chemistry and Biochemistry; University of South Carolina; 631 Sumter St. 29208 Columbia SC USA
| | - Brandon K. Redden
- Department of Chemistry and Biochemistry; University of South Carolina; 631 Sumter St. 29208 Columbia SC USA
| | - Sheryl L. Wiskur
- Department of Chemistry and Biochemistry; University of South Carolina; 631 Sumter St. 29208 Columbia SC USA
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17
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Seliger J, Oestreich M. Making the Silylation of Alcohols Chiral: Asymmetric Protection of Hydroxy Groups. Chemistry 2019; 25:9358-9365. [PMID: 30919539 DOI: 10.1002/chem.201900792] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Indexed: 11/11/2022]
Abstract
The non-enzymatic kinetic resolution of racemic mixtures of alcohols by silylation had been unknown before the turn of the century. This stands in stark contrast to established acylation techniques. The same applies to the related desymmetrization of diols. This might come as a surprise, given the significance of silyl ethers as protecting groups in multistep synthesis of complex molecules. The situation changed after a seminal report by Ishikawa nearly twenty years ago. Since then, enantioselective silylation of alcohols has matured and grown into an independent research field with organocatalytic and transition-metal-catalyzed approaches providing powerful solutions. This Minireview summarizes these recent advances with particular emphasis on the stereoselective dehydrogenative coupling of alcohols and hydrosilanes.
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Affiliation(s)
- Jan Seliger
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany
| | - Martin Oestreich
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany
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18
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Wang Y, Zhou H, Yang K, You C, Zhang L, Luo S. Steric Effect of Protonated Tertiary Amine in Primary–Tertiary Diamine Catalysis: A Double-Layered Sterimol Model. Org Lett 2018; 21:407-411. [DOI: 10.1021/acs.orglett.8b03584] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yaning Wang
- Key Laboratory for Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Han Zhou
- Key Laboratory for Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Kai Yang
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Chang You
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Long Zhang
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing 100084, China
- Key Laboratory for Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation center of Chemical Science and Engineering, Tianjin 300071, China
| | - Sanzhong Luo
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing 100084, China
- Key Laboratory for Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation center of Chemical Science and Engineering, Tianjin 300071, China
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19
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Marin-Luna M, Patschinski P, Zipse H. Substituent Effects in the Silylation of Secondary Alcohols: A Mechanistic Study. Chemistry 2018; 24:15052-15058. [DOI: 10.1002/chem.201803014] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Marta Marin-Luna
- Department of Chemistry; LMU München; Butenandtstrass 5-13 81377 München Germany
| | - Pascal Patschinski
- Department of Chemistry; LMU München; Butenandtstrass 5-13 81377 München Germany
| | - Hendrik Zipse
- Department of Chemistry; LMU München; Butenandtstrass 5-13 81377 München Germany
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20
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Marin-Luna M, Pölloth B, Zott F, Zipse H. Size-dependent rate acceleration in the silylation of secondary alcohols: the bigger the faster. Chem Sci 2018; 9:6509-6515. [PMID: 30310581 PMCID: PMC6115683 DOI: 10.1039/c8sc01889h] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 06/27/2018] [Indexed: 01/25/2023] Open
Abstract
Relative rates for the reaction of secondary alcohols carrying large aromatic moieties with silyl chlorides carrying equally large substituents have been determined in organic solvents. Introducing thoroughly matching pairs of big dispersion energy donor (DED) groups enhanced rate constants up to four times, notably depending on the hydrogen bond donor ability of the solvent. A linear correlation between computed dispersion energy contributions to the stability of the silyl ether products and experimental relative rate constants was found. These results indicate a cooperation between solvophobic effects and DED-groups in the kinetic control of silylation reactions.
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Affiliation(s)
- Marta Marin-Luna
- Department of Chemistry , LMU München , Butenandtstrasse 5-13 , 81377 , München , Germany .
| | - Benjamin Pölloth
- Department of Chemistry , LMU München , Butenandtstrasse 5-13 , 81377 , München , Germany .
| | - Fabian Zott
- Department of Chemistry , LMU München , Butenandtstrasse 5-13 , 81377 , München , Germany .
| | - Hendrik Zipse
- Department of Chemistry , LMU München , Butenandtstrasse 5-13 , 81377 , München , Germany .
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21
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Li S, Liu B, Chen L, Li X, Cheng JP. N-Heterocyclic carbene promoted enantioselective desymmetrization reaction of diarylalkane-bisphenols. Org Chem Front 2018. [DOI: 10.1039/c7qo01083d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An enantioselective NHC-catalyzed desymmetrization reaction of diarylalkane-bisphenols with aldehydes was reported under the guidance of linear free energy relationships (LFERs).
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Affiliation(s)
- Shoulei Li
- State Key Laboratory of Elemento-Organic Chemistry
- Collaborative Innovation Center of Chemical Science and Engineering
- Nankai University
- Tianjin 300071
- China
| | - Bin Liu
- State Key Laboratory of Elemento-Organic Chemistry
- Collaborative Innovation Center of Chemical Science and Engineering
- Nankai University
- Tianjin 300071
- China
| | - Li Chen
- State Key Laboratory of Elemento-Organic Chemistry
- Collaborative Innovation Center of Chemical Science and Engineering
- Nankai University
- Tianjin 300071
- China
| | - Xin Li
- State Key Laboratory of Elemento-Organic Chemistry
- Collaborative Innovation Center of Chemical Science and Engineering
- Nankai University
- Tianjin 300071
- China
| | - Jin-Pei Cheng
- State Key Laboratory of Elemento-Organic Chemistry
- Collaborative Innovation Center of Chemical Science and Engineering
- Nankai University
- Tianjin 300071
- China
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22
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Yoshimatsu S, Yamada A, Nakata K. Silylative Kinetic Resolution of Racemic 1-Indanol Derivatives Catalyzed by Chiral Guanidine. J Org Chem 2017; 83:452-458. [DOI: 10.1021/acs.joc.7b02493] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Shuhei Yoshimatsu
- Department of Material Science,
Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu Matsue, Shimane 690-8504, Japan
| | - Akira Yamada
- Department of Material Science,
Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu Matsue, Shimane 690-8504, Japan
| | - Kenya Nakata
- Department of Material Science,
Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu Matsue, Shimane 690-8504, Japan
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23
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Broad-spectrum kinetic resolution of alcohols enabled by Cu-H-catalysed dehydrogenative coupling with hydrosilanes. Nat Commun 2017; 8:15547. [PMID: 28569754 PMCID: PMC5461486 DOI: 10.1038/ncomms15547] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 04/07/2017] [Indexed: 11/08/2022] Open
Abstract
The enantioselective silylation of racemic alcohols, where one enantiomer reacts faster than the other, is an alternative approach to established enzymatic and non-enzymatic acylation techniques. The existing art is either limited to structurally biased alcohols or requires elaborate catalysts. Simple substrates, such as benzylic and allylic alcohols, with no coordinating functionality in the proximity of the hydroxy group have been challenging in these kinetic resolutions. We report here the identification of a broadly applicable chiral catalyst for the enantioselective dehydrogenative coupling of alcohols and hydrosilanes with both the chiral ligand and the hydrosilane being commercially available. The efficiency of kinetic resolutions is characterized by the selectivity factor, that is, the ratio of the reaction rates of the fast-reacting over the slow-reacting enantiomer. The selectivity factors achieved with the new method are good for acyclic benzylic alcohols (≤170) and high for synthetically usefully cyclic benzylic (≤40.1) and allylic alcohols (≤159). Kinetic resolution of alcohols by silylation is an attractive method to produce enantiopure compounds, but known systems often display limited substrate scope. Here the authors report a copper catalysed enantioselective dehydrogenative silylation of alcohols that have high selectivity across a broad range of substrates.
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24
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Yang C, Wang J, Liu Y, Ni X, Li X, Cheng J. Study on the Catalytic Behavior of Bifunctional Hydrogen‐Bonding Catalysts Guided by Free Energy Relationship Analysis of Steric Parameters. Chemistry 2017; 23:5488-5497. [DOI: 10.1002/chem.201605666] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Indexed: 01/09/2023]
Affiliation(s)
- Chen Yang
- State Key Laboratory of Elemento-organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Jie Wang
- State Key Laboratory of Elemento-organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Yang Liu
- State Key Laboratory of Elemento-organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Xiang Ni
- State Key Laboratory of Elemento-organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Xin Li
- State Key Laboratory of Elemento-organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300071 P. R. China
| | - Jin‐Pei Cheng
- State Key Laboratory of Elemento-organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300071 P. R. China
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25
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Wang S, Izquierdo J, Rodríguez-Escrich C, Pericàs MA. Asymmetric [4 + 2] Annulation Reactions Catalyzed by a Robust, Immobilized Isothiourea. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00360] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shoulei Wang
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Javier Izquierdo
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Carles Rodríguez-Escrich
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Miquel A. Pericàs
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
- Departament
de Química Inorgànica i Orgànica, Universitat de Barcelona, 08080 Barcelona, Spain
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26
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Merad J, Pons JM, Chuzel O, Bressy C. Enantioselective Catalysis by Chiral Isothioureas. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600399] [Citation(s) in RCA: 131] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jérémy Merad
- Aix Marseille Université, Centrale Marseille; CNRS, iSm2 UMR 7313; 13397 Marseille France
| | - Jean-Marc Pons
- Aix Marseille Université, Centrale Marseille; CNRS, iSm2 UMR 7313; 13397 Marseille France
| | - Olivier Chuzel
- Aix Marseille Université, Centrale Marseille; CNRS, iSm2 UMR 7313; 13397 Marseille France
| | - Cyril Bressy
- Aix Marseille Université, Centrale Marseille; CNRS, iSm2 UMR 7313; 13397 Marseille France
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27
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Lin CY, Lim S, Anslyn EV. Model Building Using Linear Free Energy Relationship Parameters-Eliminating Calibration Curves for Optical Analysis of Enantiomeric Excess. J Am Chem Soc 2016; 138:8045-7. [PMID: 27304670 DOI: 10.1021/jacs.6b03928] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Linear free energy relationship (LFER) parameters are routinely used to parametrize physicochemical effects while investigating reaction mechanisms. In this Communication, we describe an alternate application for LFERs: training sets for model building in an analytical application. In this study, the sterics, quantified by Charton parameters (Δv), of nine secondary chiral alcohol analytes were correlated to the circular dichroism output from a chiral alcohol optical sensor. To test the validity of the model, the correlative linear model was applied to determine the enantiomeric excess of samples of two alcohols without a priori knowledge of a calibration curve. The error in this method was comparable to those of previous experimental methods (<5%).
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Affiliation(s)
- Chung-Yon Lin
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Stephanie Lim
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Eric V Anslyn
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States
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28
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Yang C, Zhang EG, Li X, Cheng JP. Asymmetric Conjugate Addition of Benzofuran-2-ones to Alkyl 2-Phthalimidoacrylates: Modeling Structure-Stereoselectivity Relationships with Steric and Electronic Parameters. Angew Chem Int Ed Engl 2016; 55:6506-10. [DOI: 10.1002/anie.201601028] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 02/29/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Chen Yang
- State Key Laboratory of Elemento-organic Chemistry, Department of Chemistry; Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - En-Ge Zhang
- State Key Laboratory of Elemento-organic Chemistry, Department of Chemistry; Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Xin Li
- State Key Laboratory of Elemento-organic Chemistry, Department of Chemistry; Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Jin-Pei Cheng
- State Key Laboratory of Elemento-organic Chemistry, Department of Chemistry; Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
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29
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Yang C, Zhang EG, Li X, Cheng JP. Asymmetric Conjugate Addition of Benzofuran-2-ones to Alkyl 2-Phthalimidoacrylates: Modeling Structure-Stereoselectivity Relationships with Steric and Electronic Parameters. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201601028] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Chen Yang
- State Key Laboratory of Elemento-organic Chemistry, Department of Chemistry; Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - En-Ge Zhang
- State Key Laboratory of Elemento-organic Chemistry, Department of Chemistry; Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Xin Li
- State Key Laboratory of Elemento-organic Chemistry, Department of Chemistry; Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Jin-Pei Cheng
- State Key Laboratory of Elemento-organic Chemistry, Department of Chemistry; Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
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30
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Bandar J, Pirnot MT, Buchwald SL. Mechanistic Studies Lead to Dramatically Improved Reaction Conditions for the Cu-Catalyzed Asymmetric Hydroamination of Olefins. J Am Chem Soc 2015; 137:14812-8. [PMID: 26522837 PMCID: PMC4768687 DOI: 10.1021/jacs.5b10219] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Indexed: 12/22/2022]
Abstract
Enantioselective copper(I) hydride (CuH)-catalyzed hydroamination has undergone significant development over the past several years. To gain a general understanding of the factors governing these reactions, kinetic and spectroscopic studies were performed on the CuH-catalyzed hydroamination of styrene. Reaction profile analysis, rate order assessment, and Hammett studies indicate that the turnover-limiting step is regeneration of the CuH catalyst by reaction with a silane, with a phosphine-ligated copper(I) benzoate as the catalyst resting state. Spectroscopic, electrospray ionization mass spectrometry, and nonlinear effect studies are consistent with a monomeric active catalyst. With this insight, targeted reagent optimization led to the development of an optimized protocol with an operationally simple setup (ligated copper(II) precatalyst, open to air) and short reaction times (<30 min). This improved protocol is amenable to a diverse range of alkene and alkyne substrate classes.
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Affiliation(s)
| | | | - Stephen L. Buchwald
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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31
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Xu LW, Chen Y, Lu Y. Catalytic Silylations of Alcohols: Turning Simple Protecting-Group Strategies into Powerful Enantioselective Synthetic Methods. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/anie.201504127] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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32
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Xu LW, Chen Y, Lu Y. Katalytische Silylierung von Alkoholen: von einfachen Schutzgruppenstrategien zu leistungsfähigen enantioselektiven Synthesemethoden. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504127] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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33
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Patschinski P, Zipse H. Leaving Group Effects on the Selectivity of the Silylation of Alcohols: The Reactivity–Selectivity Principle Revisited. Org Lett 2015; 17:3318-21. [DOI: 10.1021/acs.orglett.5b01536] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pascal Patschinski
- Department of Chemistry, Ludwig-Maximilians-Universität, Butenandtstrasse 5-13, 81377 München, Germany
| | - Hendrik Zipse
- Department of Chemistry, Ludwig-Maximilians-Universität, Butenandtstrasse 5-13, 81377 München, Germany
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34
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35
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Wang L, Akhani RK, Wiskur SL. Diastereoselective and Enantioselective Silylation of 2-Arylcyclohexanols. Org Lett 2015; 17:2408-11. [DOI: 10.1021/acs.orglett.5b00919] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Li Wang
- The University of South Carolina, 631 Sumter
Street, Columbia, South Carolina 29208, United States
| | - Ravish K. Akhani
- The University of South Carolina, 631 Sumter
Street, Columbia, South Carolina 29208, United States
| | - Sheryl L. Wiskur
- The University of South Carolina, 631 Sumter
Street, Columbia, South Carolina 29208, United States
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36
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Akhani RK, Clark RW, Yuan L, Wang L, Tang C, Wiskur SL. Polystyrene-Supported Triphenylsilyl Chloride for the Silylation-Based Kinetic Resolution of Secondary Alcohols. ChemCatChem 2015. [DOI: 10.1002/cctc.201500173] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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