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Sahoo J, Panda J, Giri S, Sahoo G. Concept-Driven Chemoselective O/N-Derivatization of Prolinol: A Bee-Line Approach to Access Organocatalysts. J Org Chem 2023. [PMID: 37402179 DOI: 10.1021/acs.joc.3c00992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/06/2023]
Abstract
An investigation into the sensitivity of reaction conditions to a highly utilized protocol has been reported, wherein the mono-Boc functionalization of prolinol could be controlled for the exclusive synthesis of either N-Boc, O-Boc, or oxazolidinone derivatives. Mechanistic investigation revealed that the elementary steps could possibly be controlled by (a) a requisite base to recognize the differently acidic sites (NH and OH) for the formation of the conjugate base, which reacts with the electrophile, and (b) the difference in nucleophilicity of the conjugate basic sites. Herein, a successful chemoselective functionalization of the nucleophilic sites of prolinol by employing a suitable base is reported. This has been achieved by exploiting the relative acidity difference of NH and OH along with the reversed nucleophilicity of the corresponding conjugate bases N- and O-. This protocol has also been used for the synthesis of several O-functionalized prolinol derived organocatalysts, few of which have been newly reported.
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Affiliation(s)
- Jigyansa Sahoo
- Organocatalysis and Synthesis Laboratory, Department of Chemistry, National Institute of Technology Rourkela, Rourkela 769008, Odisha, India
| | - Jeetendra Panda
- Organocatalysis and Synthesis Laboratory, Department of Chemistry, National Institute of Technology Rourkela, Rourkela 769008, Odisha, India
| | - Santanab Giri
- School of Applied Science and Humanities, Haldia Institute of Technology, Haldia 721657, West Bengal, India
| | - Gokarneswar Sahoo
- Organocatalysis and Synthesis Laboratory, Department of Chemistry, National Institute of Technology Rourkela, Rourkela 769008, Odisha, India
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Prakash M, Rani P, Samanta S. A substrate-dependent reaction of 1-aryl-2-alkyl-1,2-diketones with 2-aroyl-1-chlorocyclopropanecarboxylates: selective access to 2',5'-dicyclopropoxy-1,1':4',1''-teraryls and pentafulvenes. Org Biomol Chem 2022; 20:6445-6458. [PMID: 35894220 DOI: 10.1039/d2ob00971d] [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
An interesting substrate-controlled one-pot approach to highly substituted 2',5'-dicyclopropoxy-1,1':4',1''-teraryls and 6-hydroxypentafulvenes involving various 1,2-diketones and 2-aroyl-1-chlorocyclopropanecarboxylates as 3C Michael acceptors triggered by Cs2CO3 has been developed. We noticed that 1,2-diketones play a decisive role in this reaction to determine the product's selectivity. For example, aryl rings having electron-poor functionalities at the para and meta-positions of 1,2-diketones led to 2,5-diarylhydroquinones selectively via a cyclodimerization/double oxa-Michael process with highly strained cyclopropenes. However, when 1-naphthyl/electron-donating aryl/ortho-aryl-substituted 1,2-diketones were chosen, the Michael-initiated ring expansion reaction (C-C and CC bonds) took place under the same conditions that gave the corresponding pentafulvenes predominately. Moreover, this reaction has several imperative features such as good to high diastereoselectivities, wide substrate scope, good functional group tolerance, transition metal-free process, etc.
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Affiliation(s)
- Meher Prakash
- Indian Institute of Technology Indore, Discipline of Chemistry, 453552, Indore, India.
| | - Poonam Rani
- Indian Institute of Technology Indore, Discipline of Chemistry, 453552, Indore, India.
| | - Sampak Samanta
- Indian Institute of Technology Indore, Discipline of Chemistry, 453552, Indore, India.
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Inomata K, Akahane Y, Miura A. Alternative Chiral Preparations of a Swaminathan Ketone via Asymmetric Aldol Reactions Mediated by Chiral Amines Bearing a Pyrrolidine. HETEROCYCLES 2020. [DOI: 10.3987/com-19-14124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Heim C, Pliatsika D, Mousavizadeh F, Bär K, Hernandez Alvarez B, Giannis A, Hartmann MD. De-Novo Design of Cereblon (CRBN) Effectors Guided by Natural Hydrolysis Products of Thalidomide Derivatives. J Med Chem 2019; 62:6615-6629. [PMID: 31251063 PMCID: PMC6750895 DOI: 10.1021/acs.jmedchem.9b00454] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
![]()
Targeted
protein degradation via cereblon (CRBN), a substrate receptor
of an E3 ubiquitin ligase complex, is an increasingly important strategy
in various clinical settings, in which the substrate specificity of
CRBN is altered via the binding of small-molecule effectors. To date,
such effectors are derived from thalidomide and confer a broad substrate
spectrum that is far from being fully characterized. Here, we employed
a rational and modular approach to design novel and minimalistic CRBN
effectors. In this approach, we took advantage of the binding modes
of hydrolyzed metabolites of several thalidomide-derived effectors,
which we elucidated via crystallography. These yielded key insights
for the optimization of the minimal core binding moiety and its linkage
to a chemical moiety that imparts substrate specificity. Based on
this scaffold, we present a first active de-novo CRBN effector that
is able to degrade the neo-substrate IKZF3 in the cell culture.
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Affiliation(s)
- Christopher Heim
- Department of Protein Evolution , Max Planck Institute for Developmental Biology , Max-Planck-Ring 5 , 72076 Tübingen , Germany
| | - Dimanthi Pliatsika
- Faculty for Chemistry und Mineralogy, Institute of Organic Chemistry , University of Leipzig , Johannisallee 29 , 04103 Leipzig , Germany
| | - Farnoush Mousavizadeh
- Faculty for Chemistry und Mineralogy, Institute of Organic Chemistry , University of Leipzig , Johannisallee 29 , 04103 Leipzig , Germany
| | - Kerstin Bär
- Department of Protein Evolution , Max Planck Institute for Developmental Biology , Max-Planck-Ring 5 , 72076 Tübingen , Germany
| | - Birte Hernandez Alvarez
- Department of Protein Evolution , Max Planck Institute for Developmental Biology , Max-Planck-Ring 5 , 72076 Tübingen , Germany
| | - Athanassios Giannis
- Faculty for Chemistry und Mineralogy, Institute of Organic Chemistry , University of Leipzig , Johannisallee 29 , 04103 Leipzig , Germany
| | - Marcus D Hartmann
- Department of Protein Evolution , Max Planck Institute for Developmental Biology , Max-Planck-Ring 5 , 72076 Tübingen , Germany
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Togashi R, Chennapuram M, Seki C, Okuyama Y, Kwon E, Uwai K, Tokiwa M, Takeshita M, Nakano H. 2-Azanorbornane-Based Amino Alcohol Organocatalysts for Asymmetric Michael Reaction of β-Keto Esters with Nitroolefins. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900308] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Rei Togashi
- Department of Bioengineering; Graduate School of Engineering; Muroran Institute of Technology.; 27-1 Mizumoto 050-8585 Muroran Japan
| | - Madhu Chennapuram
- Department of Bioengineering; Graduate School of Engineering; Muroran Institute of Technology.; 27-1 Mizumoto 050-8585 Muroran Japan
| | - Chigusa Seki
- Department of Bioengineering; Graduate School of Engineering; Muroran Institute of Technology.; 27-1 Mizumoto 050-8585 Muroran Japan
| | - Yuko Okuyama
- Graduate School of Engineering; Tohoku Medicinal and Pharmaceutical University; 4-4-1 Komatsushima, Aoba-ku 981-8585 Sendai Japan
| | - Eunsang Kwon
- Research and Analytical Center for Giant Molecules; Graduate School of Sciences; Tohoku University; 6-3 Aoba, Aramaki, Aoba-ku 980-8578 Sendai Japan
| | - Koji Uwai
- Department of Bioengineering; Graduate School of Engineering; Muroran Institute of Technology.; 27-1 Mizumoto 050-8585 Muroran Japan
| | - Michio Tokiwa
- Graduate School of Sciences; Tokiwakai Group; 62 Numajiri Tsuduri-chou Uchigo 973-8053 Iwaki Japan
| | - Mitsuhiro Takeshita
- Graduate School of Sciences; Tokiwakai Group; 62 Numajiri Tsuduri-chou Uchigo 973-8053 Iwaki Japan
| | - Hiroto Nakano
- Department of Bioengineering; Graduate School of Engineering; Muroran Institute of Technology.; 27-1 Mizumoto 050-8585 Muroran Japan
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Synthesis of 1,2-phenylenedimethanols by base-promoted reduction of isobenzofuran-1(3H)-ones with silane. CHINESE CHEM LETT 2019. [DOI: 10.1016/j.cclet.2018.11.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Sieverding P, Osterbrink J, Besson C, Kögerler P. Kinetics and Mechanism of Pyrrolidine Buffer-Catalyzed Fulvene Formation. J Org Chem 2019; 84:486-494. [PMID: 30540466 DOI: 10.1021/acs.joc.8b01660] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Rapid synthesis of fulvenes is achieved using pyrrolidinium/pyrrolidine buffers in anhydrous acetonitrile. Time-dependent UV-vis absorption and NMR spectroscopy reveal that the rate and yield of fulvene formation depend strongly on both the presence of acid in the medium and the choice of solvent, and they are negatively affected by water. Kinetic data have been collected for various substrates, and the synthetic benefits of the adjusted reaction conditions are showcased. Enhancements of reaction rates are found in comparison to literature procedures. α-Unsaturated fulvenes that were previously difficult to access can now be obtained in good yields.
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Affiliation(s)
- Paul Sieverding
- Institute of Inorganic Chemistry , RWTH Aachen University , 52062 Aachen , Germany
| | - Johanna Osterbrink
- Institute of Inorganic Chemistry , RWTH Aachen University , 52062 Aachen , Germany
| | - Claire Besson
- Institute of Inorganic Chemistry , RWTH Aachen University , 52062 Aachen , Germany.,Department of Chemistry , The George Washington University , Washington , D.C. 20052 , United States
| | - Paul Kögerler
- Institute of Inorganic Chemistry , RWTH Aachen University , 52062 Aachen , Germany
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