1
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Mohammadlou A, Joshi C, Smith BP, Zheng L, Corio SA, Canestraight VM, Torabi Kohlbouni S, Taimoory SM, Borhan B, Staples R, Vetticatt MJ, Wulff WD. A Lewis Acid-Controlled Enantiodivergent Epoxidation of Aldehydes. ACS Catal 2023; 13:13117-13126. [PMID: 38516048 PMCID: PMC10956421 DOI: 10.1021/acscatal.3c03929] [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] [Indexed: 03/23/2024]
Abstract
Two epoxidation catalysts, one of which consists of two VANOL ligands and an aluminum and the other that consists of two VANOL ligands and a boron, were compared. Both catalysts are highly effective in the catalytic asymmetric epoxidation of a variety of aromatic and aliphatic aldehydes with diazoacetamides, giving high yields and excellent asymmetric inductions. The aluminum catalyst is effective at 0 °C and the boron catalyst at -40 °C. Although both the aluminum and boron catalysts of (R)-VANOL give very high asymmetric inductions (up to 99% ee), they give opposite enantiomers of the epoxide. The mechanism, rate- and enantioselectivity-determining step, and origin of enantiodivergence are evaluated using density functional theory calculations.
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Affiliation(s)
- Aliakbar Mohammadlou
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Chetan Joshi
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Brendyn P Smith
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Li Zheng
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Stephanie A Corio
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Virginia M Canestraight
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | | | - S Maryamdokht Taimoory
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Babak Borhan
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Richard Staples
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Mathew J Vetticatt
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - William D Wulff
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
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2
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Tanpure SD, Kardile RD, Liu RS. Relay Zn( ii)- and Au( i)-catalyzed aziridination/cyclization/ring expansion sequence to form 3-benzazepine derivatives. Org Chem Front 2023. [DOI: 10.1039/d3qo00134b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
The synthesis of 3H-benzo[d]azepine-2-carboxylates from 2-alkynylphenyl aldimines and α-diazo esters using Zn(ii) and Au(i) catalysts is described.
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3
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Narode AS, Liu RS. Gold-Catalyzed Bicyclic Annulations of N-( o-Alkynylphenyl)imines with α-Diazo Esters to Form 5,6-Dihydroindolo[2,1- a]isoquinolines. Org Lett 2022; 24:2165-2169. [DOI: 10.1021/acs.orglett.2c00450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akshay Subhash Narode
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan 30013, ROC
| | - Rai-Shung Liu
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan 30013, ROC
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4
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Osminski WEG, Lu Z, Zhao W, Mohammadlou A, Yin X, Matthews EC, Canestraight VM, Staples RJ, Allen CJ, Hirschi JS, Wulff WD. Probing Catalyst Function - Electronic Modulation of Chiral Polyborate Anionic Catalysts. J Org Chem 2021; 86:17762-17773. [PMID: 34852456 DOI: 10.1021/acs.joc.1c01769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Boroxinate complexes of VAPOL and VANOL are a chiral anionic platform that can serve as a versatile staging arena for asymmetric catalysis. The structural underpinning of the platform is a chiral polyborate core that covalently links together alcohols (or phenols) and vaulted biaryl ligands. The polyborate platform is assembled in situ by the substrate of the reaction, and thus a multiplex of chiral catalysts can be rapidly assembled from various alcohols (or phenols) and bis-phenol ligands for screening of catalyst activity. In the present study, variations in the steric and electronic properties of the phenol/alcohol component of the boroxinate catalyst are probed to reveal their effects on the asymmetric induction in the catalytic asymmetric aziridination reaction. A Hammett study is consistent with a mechanism in which the two substrates are hydrogen-bonded to the boroxinate core in the enantiogenic step. The results of the Hammett study are supported by a computational study in which it is found that the H-O distance of the protonated imine hydrogen bonded to the anionic boroxinate core decreases with an increase in the electron releasing ability of the phenol unit incorporated into the boroxinate. The results are not consistent with a mechanism in which the boroxinate catalyst functions as a Lewis acid and activates the imine by a Lewis acid/Lewis base interaction.
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Affiliation(s)
- Wynter E G Osminski
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Zhenjie Lu
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Wenjun Zhao
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Aliakbar Mohammadlou
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Xiaopeng Yin
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Emily C Matthews
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Virginia M Canestraight
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Richard J Staples
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Connor J Allen
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Jennifer S Hirschi
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - William D Wulff
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
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5
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Chai GL, Qiao Y, Zhang P, Guo R, Wang J, Chang J. Chiral Hydroxytetraphenylene-Boron Complex Catalyzed Asymmetric Diels-Alder Cycloaddition of 2'-Hydroxychalcones. Org Lett 2020; 22:8023-8027. [PMID: 32991185 DOI: 10.1021/acs.orglett.0c02978] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
(S)-2,15-Cl2-DHTP-boron complex catalyst for the asymmetric Diels-Alder cycloaddition of 2'-hydroxychalcones and dienes was developed and tested. The resulting cyclohexenes with three chiral centers were obtained in high yields (up to 98%) with excellent stereoselectivities (up to >20:1 endo/exo, >99% ee). This catalytic system features high efficiency, broad substrate scopes, and mild reaction conditions. In addition, a DFT study was performed to explain the stereochemical course of the asymmetric induction.
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Affiliation(s)
- Guo-Li Chai
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Yan Qiao
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Ping Zhang
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Rong Guo
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Juan Wang
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Junbiao Chang
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
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6
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Yin X, Zheng L, Mohammadlou A, Cagnon BR, Wulff WD. Resolution of Vaulted Biaryl Ligands via Borate Esters of Quinine and Quinidine. J Org Chem 2020; 85:10432-10450. [PMID: 32687706 DOI: 10.1021/acs.joc.0c00494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Given the sudden and unexplained rise in the cost of (+)- and (-)-sparteine, an alternative method for the resolution of vaulted biaryls has been developed. This method involves the reaction of a racemic vaulted biaryl ligand with one equivalent of BH3·SMe2 and one equivalent of either quinine or quinidine. A precipitate then forms from the resulting mixture of diastereomeric borates as a result of differential solubilities. Hydrolysis of the precipitate then liberates the (S)-ligand in the case of quinine and the (R)-ligand in the case of quinidine, both with >99% ee. This method has been applied to 16 different vaulted biaryl ligands, including 10 whose preparation is described here for the first time. In addition, proof of principle has been demonstrated for the dynamic thermodynamic resolution of the vaulted biaryl ligands with this method in combination with a nonchiral copper(II) complex that can racemize the ligand.
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Affiliation(s)
- Xiaopeng Yin
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Li Zheng
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Aliakbar Mohammadlou
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Brian R Cagnon
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - William D Wulff
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
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7
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Gupta AK, Yin X, Mukherjee M, Desai AA, Mohammadlou A, Jurewicz K, Wulff WD. Catalytic Asymmetric Epoxidation of Aldehydes with Two VANOL-Derived Chiral Borate Catalysts. Angew Chem Int Ed Engl 2019; 58:3361-3367. [PMID: 30556933 DOI: 10.1002/anie.201809511] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 12/13/2018] [Indexed: 12/15/2022]
Abstract
A highly diastereo- and enantioselective method for the epoxidation of aldehydes with α-diazoacetamides has been developed with two different borate ester catalysts of VANOL. Both catalytic systems are general for aromatic, aliphatic, and acetylenic aldehydes, giving high yields and inductions for nearly all cases. One borate ester catalyst has two molecules of VANOL and the other only one VANOL. Catalysts generated from BINOL and VAPOL are ineffective catalysts. An application is shown for access to the side-chain of taxol.
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Affiliation(s)
- Anil K Gupta
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Xiaopeng Yin
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Munmun Mukherjee
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Aman A Desai
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Aliakbar Mohammadlou
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Kelsee Jurewicz
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - William D Wulff
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
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8
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Gupta AK, Yin X, Mukherjee M, Desai AA, Mohammadlou A, Jurewicz K, Wulff WD. Catalytic Asymmetric Epoxidation of Aldehydes with Two VANOL-Derived Chiral Borate Catalysts. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201809511] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Anil K. Gupta
- Department of Chemistry; Michigan State University; East Lansing MI 48824 USA
| | - Xiaopeng Yin
- Department of Chemistry; Michigan State University; East Lansing MI 48824 USA
| | - Munmun Mukherjee
- Department of Chemistry; Michigan State University; East Lansing MI 48824 USA
| | - Aman A. Desai
- Department of Chemistry; Michigan State University; East Lansing MI 48824 USA
| | | | - Kelsee Jurewicz
- Department of Chemistry; Michigan State University; East Lansing MI 48824 USA
| | - William D. Wulff
- Department of Chemistry; Michigan State University; East Lansing MI 48824 USA
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9
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Singh GS. Advances in synthesis and chemistry of aziridines. ADVANCES IN HETEROCYCLIC CHEMISTRY 2019. [DOI: 10.1016/bs.aihch.2018.12.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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10
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de los Santos JM, Ochoa de Retana AM, Martínez de Marigorta E, Vicario J, Palacios F. Catalytic Asymmetric Darzens and Aza‐Darzens Reactions for the Synthesis of Chiral Epoxides and Aziridines. ChemCatChem 2018. [DOI: 10.1002/cctc.201801026] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jesús M. de los Santos
- Departamento de Química Orgánica I Facultad de Farmacia Centro de Investigaciones y Estudios Avanzados “Lucio Lascaray” Universidad del País Vasco UPV/EHU Paseo de la Universidad 7 Vitoria 01006 Spain
| | - Ana M. Ochoa de Retana
- Departamento de Química Orgánica I Facultad de Farmacia Centro de Investigaciones y Estudios Avanzados “Lucio Lascaray” Universidad del País Vasco UPV/EHU Paseo de la Universidad 7 Vitoria 01006 Spain
| | - Edorta Martínez de Marigorta
- Departamento de Química Orgánica I Facultad de Farmacia Centro de Investigaciones y Estudios Avanzados “Lucio Lascaray” Universidad del País Vasco UPV/EHU Paseo de la Universidad 7 Vitoria 01006 Spain
| | - Javier Vicario
- Departamento de Química Orgánica I Facultad de Farmacia Centro de Investigaciones y Estudios Avanzados “Lucio Lascaray” Universidad del País Vasco UPV/EHU Paseo de la Universidad 7 Vitoria 01006 Spain
| | - Francisco Palacios
- Departamento de Química Orgánica I Facultad de Farmacia Centro de Investigaciones y Estudios Avanzados “Lucio Lascaray” Universidad del País Vasco UPV/EHU Paseo de la Universidad 7 Vitoria 01006 Spain
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11
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Chiral Diol-Based Organocatalysts in Enantioselective Reactions. Molecules 2018; 23:molecules23092317. [PMID: 30208621 PMCID: PMC6225256 DOI: 10.3390/molecules23092317] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 09/03/2018] [Accepted: 09/06/2018] [Indexed: 12/22/2022] Open
Abstract
Organocatalysis has emerged as a powerful synthetic tool in organic chemistry in the last few decades. Among various classes of organocatalysis, chiral diol-based scaffolds, such as BINOLs, VANOLs, and tartaric acid derivatives, have been widely used to induce enantioselectivity due to the ability of the hydroxyls to coordinate with the Lewis acidic sites of reagents or substrates and create a chiral environment for the transformation. In this review, we will discuss the applications of these diol-based catalysts in different types of reactions, including the scopes of reactions and the modes of catalyst activation. In general, the axially chiral aryl diol BINOL and VANOL derivatives serve as the most competent catalyst for most examples, but examples of exclusive success using other scaffolds, herein, suggests that they should not be overlooked. Lastly, the examples, to date, are mainly from tartrate and biaryl diol catalysts, suggesting that innovation may be available from new diol scaffolds.
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12
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Zhou Y, Gupta AK, Mukherjee M, Zheng L, Wulff WD. Multicomponent Catalytic Asymmetric Synthesis of trans-Aziridines. J Org Chem 2017; 82:13121-13140. [PMID: 29084386 DOI: 10.1021/acs.joc.7b02184] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A multicomponent trans-aziridination of aldehydes, amines, and diazo compounds with BOROX catalysts is developed. The optimal protocol is slightly different for aryl aldehydes than for aliphatic aldehydes. The key to the success with aryl aldehydes was allowing the catalyst, aldehyde, and amine to react for 20 min before addition of the diazo compound. A variety of 11 different electron-poor and electron-rich aryl aldehydes were screened to give trans-aziridines in 73-90% yield with 82-99% ee and trans/cis selectivities of 19:1 to >99:1. The optimal protocol for the trans-aziridination of aliphatic aldehydes did not require prereaction of the catalyst, aldehyde, and amine, and instead, the diazo compound could be added directly. The scope of the reaction is limited to unbranched aliphatic aldehydes and was tolerant of a number of functional groups including ethers, esters, epoxides, carbamates, and phthalimides. A total of 10 aliphatic aldehydes were examined and found to give trans-aziridines in 60-88% yield with 60-98% ee and trans/cis selectivities of 6:1 to >99:1. Alkenyl aldehydes did not react, but an alkynyl aldehyde gave a 71% yield and 95% ee of an aziridine that was found to be the cis- and not the trans-diastereomer. The aryl and aliphatic aldehydes both gave the trans-aziridines with the same absolute configuration with the same catalyst; however, in those cases where cis-aziridines were formed, the configuration was opposite for those formed from aryl versus aliphatic aldehydes.
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Affiliation(s)
- Yubai Zhou
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - Anil K Gupta
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - Munmun Mukherjee
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - Li Zheng
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
| | - William D Wulff
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
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13
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Hu G, Gupta AK, Huang L, Zhao W, Yin X, Osminski WEG, Huang RH, Wulff WD, Izzo JA, Vetticatt MJ. Pyro-Borates, Spiro-Borates, and Boroxinates of BINOL—Assembly, Structures, and Reactivity. J Am Chem Soc 2017; 139:10267-10285. [DOI: 10.1021/jacs.7b02317] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Gang Hu
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Anil K. Gupta
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Li Huang
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Wenjun Zhao
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Xiaopeng Yin
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Wynter E. G. Osminski
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Rui H. Huang
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - William D. Wulff
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Joseph A. Izzo
- Department
of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Mathew J. Vetticatt
- Department
of Chemistry, Binghamton University, Binghamton, New York 13902, United States
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14
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Mukherjee M, Zhou Y, Dai Y, Gupta AK, Pulgam VR, Staples RJ, Wulff WD. Catalyst-Controlled Multicomponent Aziridination of Chiral Aldehydes. Chemistry 2017; 23:2552-2556. [PMID: 28005302 DOI: 10.1002/chem.201605955] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Indexed: 11/06/2022]
Abstract
A highly diastereoselective and enantioselective method for the multicomponent aziridination of chiral aldehydes has been developed with BOROX catalysts of the VANOL (3,3'-diphenyl-2,2'-bi-1-naphthol) and VAPOL (2,2'-diphenyl-(4-biphenanthrol)) ligands. Very high to perfect catalyst control is observed with most all substrates examined including aldehydes with chiral centers in the α- and β-positions. High catalyst control was also observed for a number of chiral heterocyclic aldehydes allowing for the preparation of epoxy aziridines, bis(aziridines) and ethylene diaziridines. Application of this reaction in the synthesis of β3 -homo-d-alloisoleucine and β3 -homo-l-isoleucine is reported.
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Affiliation(s)
- Munmun Mukherjee
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Yubai Zhou
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Yijing Dai
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - AniL K Gupta
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - V Reddy Pulgam
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Richard J Staples
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - William D Wulff
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
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15
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Desai AA, Guan Y, Odom AL, Majumder S, Wulff WD. Self-Assembly of a Library of Polyborate Chiral Anions for Asymmetric Catalytic Quinoline Reduction. Tetrahedron Lett 2015; 56:3481-3485. [PMID: 26034335 PMCID: PMC4448761 DOI: 10.1016/j.tetlet.2015.02.063] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The 'template' polyborate BOROX catalysts are shown to mediate the asymmetric transfer hydrogenation of 2-quinolines. The rapid and simple generation of a large family of BOROX catalysts with significantly altered asymmetric pockets is described. A transition state model that explains the enantioselectivity is proposed.
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Affiliation(s)
- Aman A. Desai
- Department of Chemistry. Michigan State University, East Lansing, Michigan 48824
| | - Yong Guan
- Department of Chemistry. Michigan State University, East Lansing, Michigan 48824
| | - Aaron L. Odom
- Department of Chemistry. Michigan State University, East Lansing, Michigan 48824
| | - Supriyo Majumder
- Department of Chemistry. Michigan State University, East Lansing, Michigan 48824
| | - William D. Wulff
- Department of Chemistry. Michigan State University, East Lansing, Michigan 48824
- Department of Chemistry, Binghamton University, Binghamton, NY 13902
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16
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Wang QL, Cai T, Zhou J, Tian F, Xu XY, Wang LX. An unprecedented base-promoted domino reaction of methyleneindolinones and N-tosyloxycarbamates for the construction of bispirooxindoles and spiroaziridine oxindoles. Chem Commun (Camb) 2015; 51:10726-9. [DOI: 10.1039/c5cc03793j] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient and unprecedented domino reaction of methyleneindolinones andN-tosyloxycarbamates was realized to construct bispirooxindoles and spirooxindole aziridines.
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Affiliation(s)
- Qi-Lin Wang
- Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
| | - Tian Cai
- Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
| | - Jing Zhou
- Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
| | - Fang Tian
- Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
| | - Xiao-Ying Xu
- Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
| | - Li-Xin Wang
- Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
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17
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Guan Y, López‐Alberca MP, Lu Z, Zhang Y, Desai AA, Patwardhan AP, Dai Y, Vetticatt MJ, Wulff WD. Catalytic Asymmetric Synthesis of Alkynyl Aziridines: Both Enantiomers of
cis
‐Aziridines from One Enantiomer of the Catalyst. Chemistry 2014; 20:13894-900. [DOI: 10.1002/chem.201404587] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Indexed: 11/12/2022]
Affiliation(s)
- Yong Guan
- Department of Chemistry, Michigan State University, East Lansing, MI 48824 (USA), Fax: (001) 517‐3353‐1793 http://www2.chemistry.msu.edu/faculty/wulff/myweb26/index.htm
| | - Maria P. López‐Alberca
- Department of Chemistry, Michigan State University, East Lansing, MI 48824 (USA), Fax: (001) 517‐3353‐1793 http://www2.chemistry.msu.edu/faculty/wulff/myweb26/index.htm
| | - Zhenjie Lu
- Department of Chemistry, Michigan State University, East Lansing, MI 48824 (USA), Fax: (001) 517‐3353‐1793 http://www2.chemistry.msu.edu/faculty/wulff/myweb26/index.htm
| | - Yu Zhang
- Department of Chemistry, Michigan State University, East Lansing, MI 48824 (USA), Fax: (001) 517‐3353‐1793 http://www2.chemistry.msu.edu/faculty/wulff/myweb26/index.htm
| | - Aman A. Desai
- Department of Chemistry, Michigan State University, East Lansing, MI 48824 (USA), Fax: (001) 517‐3353‐1793 http://www2.chemistry.msu.edu/faculty/wulff/myweb26/index.htm
| | - Aniruddha P. Patwardhan
- Department of Chemistry, Michigan State University, East Lansing, MI 48824 (USA), Fax: (001) 517‐3353‐1793 http://www2.chemistry.msu.edu/faculty/wulff/myweb26/index.htm
| | - Yijing Dai
- Department of Chemistry, Michigan State University, East Lansing, MI 48824 (USA), Fax: (001) 517‐3353‐1793 http://www2.chemistry.msu.edu/faculty/wulff/myweb26/index.htm
| | | | - William D. Wulff
- Department of Chemistry, Michigan State University, East Lansing, MI 48824 (USA), Fax: (001) 517‐3353‐1793 http://www2.chemistry.msu.edu/faculty/wulff/myweb26/index.htm
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18
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Bandar JS, Sauer GS, Wulff WD, Lambert TH, Vetticatt MJ. Transition state analysis of enantioselective Brønsted base catalysis by chiral cyclopropenimines. J Am Chem Soc 2014; 136:10700-7. [PMID: 25029194 PMCID: PMC4230825 DOI: 10.1021/ja504532d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
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Experimental 13C kinetic isotope effects have been used
to interrogate the rate-limiting step of the Michael addition of glycinate
imines to benzyl acrylate catalyzed by a chiral 2,3-bis(dicyclohexylamino)
cyclopropenimine catalyst. The reaction is found to proceed via rate-limiting
carbon–carbon bond formation. The origins of enantioselectivity
and a key noncovalent CH···O interaction responsible
for transition state organization are identified on the basis of density
functional theory calculations and probed using experimental labeling
studies. The resulting high-resolution experimental picture of the
enantioselectivity-determining transition state is expected to guide
new catalyst design and reaction development.
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Affiliation(s)
- Jeffrey S Bandar
- Department of Chemistry, Columbia University , 3000 Broadway, New York, New York 10027, United States
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20
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Degennaro L, Trinchera P, Luisi R. Recent advances in the stereoselective synthesis of aziridines. Chem Rev 2014; 114:7881-929. [PMID: 24823261 DOI: 10.1021/cr400553c] [Citation(s) in RCA: 326] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Leonardo Degennaro
- Department of Pharmacy-Drug Sciences, University of Bari "A. Moro" , Via Edoardo Orabona 4, Bari 70125, Italy
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21
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Xiang S, Meyer MP. A general approach to mechanism in multiproduct reactions: product-specific intermolecular kinetic isotope effects. J Am Chem Soc 2014; 136:5832-5. [PMID: 24721128 DOI: 10.1021/ja412827c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Here we report a general method for the measurement of (13)C kinetic isotope effects at natural abundance for reactions that yield two or more products concurrently. We use, as an example, a recently reported Co-catalyzed reaction between cyclopentene and 1-phenyl-1-propyne. High-precision intermolecular (13)C isotope effects are reported for both the formal [2+2] cycloaddition (major) and Alder-ene (minor) reaction products. Mechanistic possibilities that are in accord with observed isotope effect measurements are discussed.
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Affiliation(s)
- Shuhuai Xiang
- Department of Chemistry and Biochemistry, University of California , Merced, California 95343, United States
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22
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Hashimoto T, Maruoka K. Development of Synthetic Transformations by Control of Acid-Catalyzed Reactions of Diazocarbonyl Compounds. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2013. [DOI: 10.1246/bcsj.20130164] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takuya Hashimoto
- Department of Chemistry, Graduate School of Science, Kyoto University
| | - Keiji Maruoka
- Department of Chemistry, Graduate School of Science, Kyoto University
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23
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Guan Y, Ding Z, Wulff WD. Vaulted biaryls in catalysis: A structure-activity relationship guided tour of the immanent domain of the VANOL ligand. Chemistry 2013; 19:15565-71. [PMID: 24123264 DOI: 10.1002/chem.201302451] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Indexed: 11/06/2022]
Abstract
The active site in the BOROX catalyst is a chiral polyborate anion (boroxinate) that is assembled in situ from three equivalents of B(OPh)3 and one of the VANOL ligand by a molecule of substrate. The substrates are bound to the boroxinate by H bonds to oxygen atoms O1-O3. The effects of introducing substituents at each position of the naphthalene core of the VANOL ligand are systematically investigated in an aziridination reaction. Substituents in the 4,4'- and 8,8'-positions have a negative effect on catalyst performance, whereas, substituents in the 7- and 7'-positions have the biggest impact in a positive direction.
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Affiliation(s)
- Yong Guan
- Department of Chemistry, Michigan State University, East Lansing, MI 48824 (USA)
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