1
|
Lemma B, Zhang D, Vamisetti GB, Wentz BG, Suga H, Brik A, Lubkowski J, Fushman D. Mechanism of selective recognition of Lys48-linked polyubiquitin by macrocyclic peptide inhibitors of proteasomal degradation. Nat Commun 2023; 14:7212. [PMID: 37938554 PMCID: PMC10632358 DOI: 10.1038/s41467-023-43025-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Accepted: 10/26/2023] [Indexed: 11/09/2023] Open
Abstract
Post-translational modification of proteins with polyubiquitin chains is a critical cellular signaling mechanism in eukaryotes with implications in various cellular states and processes. Unregulated ubiquitin-mediated protein degradation can be detrimental to cellular homeostasis, causing numerous diseases including cancers. Recently, macrocyclic peptides were developed that selectively target long Lysine-48-linked polyubiquitin chains (tetra-ubiquitin) to inhibit ubiquitin-proteasome system, leading to attenuation of tumor growth in vivo. However, structural determinants of the chain length and linkage selectivity by these cyclic peptides remained unclear. Here, we uncover the mechanism underlying cyclic peptide's affinity and binding selectivity by combining X-ray crystallography, solution NMR, and biochemical studies. We found that the peptide engages three consecutive ubiquitins that form a ring around the peptide and determined requirements for preferential selection of a specific trimer moiety in longer polyubiquitin chains. The structural insights gained from this work will guide the development of next-generation cyclic peptides with enhanced anti-cancer activity.
Collapse
Affiliation(s)
- Betsegaw Lemma
- Center for Biomolecular Structure and Organization, Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA
| | - Di Zhang
- Center for Structural Biology, Center for Cancer Research, National Cancer Institute, Frederick, MD, 21702, USA
| | - Ganga B Vamisetti
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa, 3200008, Israel
| | - Bryan G Wentz
- Center for Biomolecular Structure and Organization, Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA
| | - Hiroaki Suga
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Bunkyo-ku, 7-3-1 Hongo, Bunkyo, Tokyo, 113-0033, Japan
| | - Ashraf Brik
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa, 3200008, Israel.
| | - Jacek Lubkowski
- Center for Structural Biology, Center for Cancer Research, National Cancer Institute, Frederick, MD, 21702, USA.
| | - David Fushman
- Center for Biomolecular Structure and Organization, Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA.
| |
Collapse
|
2
|
Abstract
In fundamental research and drug discovery, there is still a need for effective and straightforward chemical approaches for generating cyclic peptides. The divergent synthesis of cyclic peptides remains a challenge, in particular when cyclization is carried out in the presence of unprotected side chains and a nonpeptidic component within the cycle is needed. Herein, we describe a novel and efficient strategy based on Au(I)-mediated cyclization of unprotected peptides through rapid (30-60 min) amine addition on a propargyl group to generate an imine linkage. Mechanistic insights reveal that the reaction proceeds via regioselective Markovnikov's addition of the amine on the Au(I)-activated propargyl. This strategy was successfully applied to prepare efficiently (56-94%) over 35 diverse cyclic peptides having different sequences and lengths. We have also achieved stereoselective reduction of cyclic imines employing chiral ligands. The practicality of our method was extended for the synthesis of cyclic peptides that bind Lys48-linked di-ubiquitin chains with high affinity, leading to apoptosis of cancer cells.
Collapse
Affiliation(s)
- Rajeshwer Vanjari
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 3200008, Israel
| | - Deepanjan Panda
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 3200008, Israel
| | - Shaswati Mandal
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 3200008, Israel
| | - Ganga B Vamisetti
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 3200008, Israel
| | - Ashraf Brik
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 3200008, Israel
| |
Collapse
|
3
|
Vanjari R, Eid E, Vamisetti GB, Mandal S, Brik A. Highly Efficient Cyclization Approach of Propargylated Peptides via Gold(I)-Mediated Sequential C-N, C-O, and C-C Bond Formation. ACS Cent Sci 2021; 7:2021-2028. [PMID: 34966846 PMCID: PMC8711126 DOI: 10.1021/acscentsci.1c00969] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Indexed: 05/02/2023]
Abstract
A rapid and efficient cyclization of unprotected N-propargylated peptides using the Au(I) organometallic complex is reported. The method relies on the activation of the propargyl functionality using gold(I) to produce a new linkage with the N-terminus amine at the cyclization site. The presented method features a fast reaction rate (within 20 min), mild conditions, chemoselectivity, wide sequence scope, and high yields (up to 87%). The strategy was successfully tested on a wide variety of 30 unprotected peptides having various sequences and lengths, thus providing access to structurally distinct cyclic peptides. The practical usefulness of this method was demonstrated in producing peptides that bind efficiently to Lys48-linked di- and tetra-ubiquitin chains. The new cyclic peptide modulators exhibited high permeability to living cells and promoted apoptosis via binding with the endogenous Lys48-linked ubiquitin chains.
Collapse
|
4
|
Rogers JM, Nawatha M, Lemma B, Vamisetti GB, Livneh I, Barash U, Vlodavsky I, Ciechanover A, Fushman D, Suga H, Brik A. Correction: In vivo modulation of ubiquitin chains by N-methylated non-proteinogenic cyclic peptides. RSC Chem Biol 2021; 2:944. [PMID: 34458819 PMCID: PMC8341468 DOI: 10.1039/d1cb90015c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 04/20/2021] [Indexed: 11/21/2022] Open
Abstract
Correction for ‘In vivo modulation of ubiquitin chains by N-methylated non-proteinogenic cyclic peptides’ by Joseph M. Rogers et al., RSC Chem. Biol., 2021, 2, 513–522, DOI: 10.1039/D0CB00179A.
Collapse
Affiliation(s)
- Joseph M Rogers
- Department of Chemistry, Graduate School of Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan .,Department of Drug Design and Pharmacology, University of Copenhagen Copenhagen 2100 Denmark
| | - Mickal Nawatha
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology Haifa 3200008 Israel
| | - Betsegaw Lemma
- Department of Chemistry and Biochemistry, Center for Biomolecular Structure and Organization, University of Maryland College Park MD 20742 USA
| | - Ganga B Vamisetti
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology Haifa 3200008 Israel
| | - Ido Livneh
- The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology Haifa 31096 Israel
| | - Uri Barash
- The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology Haifa 31096 Israel
| | - Israel Vlodavsky
- The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology Haifa 31096 Israel
| | - Aaron Ciechanover
- The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology Haifa 31096 Israel
| | - David Fushman
- Department of Chemistry and Biochemistry, Center for Biomolecular Structure and Organization, University of Maryland College Park MD 20742 USA
| | - Hiroaki Suga
- Department of Chemistry, Graduate School of Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Ashraf Brik
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology Haifa 3200008 Israel
| |
Collapse
|
5
|
Vamisetti GB, Meledin R, Nawatha M, Suga H, Brik A. The Development of a Fluorescence-Based Competitive Assay Enabled the Discovery of Dimeric Cyclic Peptide Modulators of Ubiquitin Chains. Angew Chem Int Ed Engl 2021; 60:7018-7023. [PMID: 33326152 PMCID: PMC8048552 DOI: 10.1002/anie.202013392] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 12/13/2020] [Indexed: 12/15/2022]
Abstract
Development of modulators targeting specific interactions of ubiquitin-based conjugates with their partners is a formidable task since it requires a suitable screening assay and homogeneous ubiquitin conjugates. We developed a novel high-throughput strategy for screening ligands for Lys48-linked tetraubiquitin chain in a relatively simple, fast, and affordable manner. This approach combined with a state-of-the-art toolbox of chemical protein synthesis and a specially optimized Cys deprotection protocol enabled us to design highly potent, Lys48-linked tetraubiquitin chain selective "next generation" dimeric peptide modulators. The dimeric peptide exhibited cancer cell permeability and induced cell death with higher efficiency compared to its monocyclic analogue. These features make our dimeric peptide a promising candidate for further studies using in vivo models. Our assay can be adopted for other various ubiquitin chains in their free or anchored forms as well as conjugates for Ub-like modifiers.
Collapse
Affiliation(s)
- Ganga B. Vamisetti
- SchulichFaculty of ChemistryTechnion-Israel Institute of TechnologyHaifa3200008Israel
| | - Roman Meledin
- SchulichFaculty of ChemistryTechnion-Israel Institute of TechnologyHaifa3200008Israel
| | - Mickal Nawatha
- SchulichFaculty of ChemistryTechnion-Israel Institute of TechnologyHaifa3200008Israel
| | - Hiroaki Suga
- Department of ChemistrySchool of ScienceThe University of TokyoTokyo113-0033Japan
| | - Ashraf Brik
- SchulichFaculty of ChemistryTechnion-Israel Institute of TechnologyHaifa3200008Israel
| |
Collapse
|
6
|
Vamisetti GB, Meledin R, Nawatha M, Suga H, Brik A. The Development of a Fluorescence‐Based Competitive Assay Enabled the Discovery of Dimeric Cyclic Peptide Modulators of Ubiquitin Chains. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202013392] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ganga B. Vamisetti
- Schulich Faculty of Chemistry Technion-Israel Institute of Technology Haifa 3200008 Israel
| | - Roman Meledin
- Schulich Faculty of Chemistry Technion-Israel Institute of Technology Haifa 3200008 Israel
| | - Mickal Nawatha
- Schulich Faculty of Chemistry Technion-Israel Institute of Technology Haifa 3200008 Israel
| | - Hiroaki Suga
- Department of Chemistry School of Science The University of Tokyo Tokyo 113-0033 Japan
| | - Ashraf Brik
- Schulich Faculty of Chemistry Technion-Israel Institute of Technology Haifa 3200008 Israel
| |
Collapse
|
7
|
Rogers JM, Nawatha M, Lemma B, Vamisetti GB, Livneh I, Barash U, Vlodavsky I, Ciechanover A, Fushman D, Suga H, Brik A. In vivo modulation of ubiquitin chains by N-methylated non-proteinogenic cyclic peptides. RSC Chem Biol 2020; 2:513-522. [PMID: 34179781 PMCID: PMC8232551 DOI: 10.1039/d0cb00179a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Cancer and other disease states can change the landscape of proteins post-translationally tagged with ubiquitin (Ub) chains. Molecules capable of modulating Ub chains are potential therapeutic agents, but their discovery represents a significant challenge. Recently, it was shown that de novo cyclic peptides, selected from trillion-member random libraries, are capable of binding particular Ub chains. However, these peptides were overwhelmingly proteinogenic, so the prospect of in vivo activity was uncertain. Here, we report the discovery of small, non-proteinogenic cyclic peptides, rich in non-canonical features like N-methylation, which can tightly and specifically bind Lys48-linked Ub chains. These peptides engage three Lys48-linked Ub units simultaneously, block the action of deubiquitinases and the proteasome, induce apoptosis in vitro, and attenuate tumor growth in vivo. This highlights the potential of non-proteinogenic cyclic peptide screening to rapidly find in vivo-active leads, and the targeting of ubiquitin chains as a promising anti-cancer mechanism of action.
Collapse
Affiliation(s)
- Joseph M Rogers
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.,Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen 2100, Denmark
| | - Mickal Nawatha
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 3200008, Israel
| | - Betsegaw Lemma
- Department of Chemistry and Biochemistry, Center for Biomolecular Structure and Organization, University of Maryland, College Park, MD 20742, USA
| | - Ganga B Vamisetti
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 3200008, Israel
| | - Ido Livneh
- The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 31096, Israel
| | - Uri Barash
- The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 31096, Israel
| | - Israel Vlodavsky
- The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 31096, Israel
| | - Aaron Ciechanover
- The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 31096, Israel
| | - David Fushman
- Department of Chemistry and Biochemistry, Center for Biomolecular Structure and Organization, University of Maryland, College Park, MD 20742, USA
| | - Hiroaki Suga
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Ashraf Brik
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 3200008, Israel
| |
Collapse
|
8
|
Vamisetti GB, Satish G, Sulkshane P, Mann G, Glickman MH, Brik A. On-Demand Detachment of Succinimides on Cysteine to Facilitate (Semi)Synthesis of Challenging Proteins. J Am Chem Soc 2020; 142:19558-19569. [PMID: 33136379 PMCID: PMC7705887 DOI: 10.1021/jacs.0c07663] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
![]()
The
maleimide group is a widely used reagent for bioconjugation
of peptides, proteins, and oligonucleotides employing Michael addition
and Diels–Alder cycloaddition reactions. However, the utility
of this functionality in chemical synthesis of peptides and proteins
remains unexplored. We report, for the first time that PdII complexes can mediate the efficient removal of various succinimide
derivatives in aqueous conditions. Succinimide removal by PdII was applied for the synthesis of two ubiquitin activity-based probes
(Ub-ABPs) employing solid phase chemical ligation (SPCL). SPCL was
achieved through a sequential three segment ligation on a polymer
support via a maleimide anchor. The obtained probes successfully formed
the expected covalent complexes with deubiquitinating enzymes (DUBs)
USP2 and USP7, highlighting the use of our new method for efficient
preparation of unique synthetic proteins. Importantly, we demonstrate
the advantages of our newly developed method for the protection and
deprotection of native cysteine with a succinimide group in a peptide
fragment derived from thioredoxin-1 (Trx-1) obtained via intein based
expression to enable ligation/desulfurization and subsequent disulfide
bond formation in a one-pot process.
Collapse
Affiliation(s)
- Ganga B Vamisetti
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 3200008, Israel
| | - Gandhesiri Satish
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 3200008, Israel
| | - Prasad Sulkshane
- Faculty of Biology, Technion-Israel Institute of Technology, Haifa 3200008, Israel
| | - Guy Mann
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 3200008, Israel
| | - Michael H Glickman
- Faculty of Biology, Technion-Israel Institute of Technology, Haifa 3200008, Israel
| | - Ashraf Brik
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 3200008, Israel
| |
Collapse
|
9
|
Mann G, Satish G, Meledin R, Vamisetti GB, Brik A. Palladium-Mediated Cleavage of Proteins with Thiazolidine-Modified Backbone in Live Cells. Angew Chem Int Ed Engl 2019; 58:13540-13549. [PMID: 31402546 DOI: 10.1002/anie.201906545] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2019] [Revised: 07/07/2019] [Indexed: 12/20/2022]
Abstract
Chemical protein synthesis and biorthogonal modification chemistries allow production of unique proteins for a range of biological studies. Bond-forming reactions for site-selective protein labeling are commonly used in these endeavors. Selective bond-cleavage reactions, however, are much less explored and still pose a great challenge. In addition, most of studies with modified proteins prepared by either total synthesis or semisynthesis have been applied mainly for in vitro experiments with very limited extension to live cells. Reported here is an approach for studying uniquely modified proteins containing a traceless cell delivery unit and palladium-based cleavable element for chemical activation, and monitoring the effect of these proteins in live cells. This approach is demonstrated for the synthesis of a caged ubiquitin-aldehyde, which was decaged for the inhibition of deubiquitinases in live cells.
Collapse
Affiliation(s)
- Guy Mann
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 3200008, Israel
| | - Gandhesiri Satish
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 3200008, Israel
| | - Roman Meledin
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 3200008, Israel
| | - Ganga B Vamisetti
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 3200008, Israel
| | - Ashraf Brik
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 3200008, Israel
| |
Collapse
|
10
|
Mann G, Satish G, Meledin R, Vamisetti GB, Brik A. Palladium‐Mediated Cleavage of Proteins with Thiazolidine‐Modified Backbone in Live Cells. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906545] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Guy Mann
- Schulich Faculty of ChemistryTechnion-Israel Institute of Technology Haifa 3200008 Israel
| | - Gandhesiri Satish
- Schulich Faculty of ChemistryTechnion-Israel Institute of Technology Haifa 3200008 Israel
| | - Roman Meledin
- Schulich Faculty of ChemistryTechnion-Israel Institute of Technology Haifa 3200008 Israel
| | - Ganga B. Vamisetti
- Schulich Faculty of ChemistryTechnion-Israel Institute of Technology Haifa 3200008 Israel
| | - Ashraf Brik
- Schulich Faculty of ChemistryTechnion-Israel Institute of Technology Haifa 3200008 Israel
| |
Collapse
|
11
|
Vamisetti GB, Meledin R, Gopinath P, Brik A. Halogen Substituents in the Isoquinoline Scaffold Switches the Selectivity of Inhibition between USP2 and USP7. Chembiochem 2018; 20:282-286. [PMID: 30474907 DOI: 10.1002/cbic.201800612] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Indexed: 12/15/2022]
Abstract
Deubiquitinases are important components of the protein regulatory network and, hence, constitute a tempting drug target. We report herein structure-activity relationship studies to develop halogen-substituted isoquionoline-1,3-dione-based inhibitors of the deubiquitinase USP2. In contrast to our previous reports, the best compound discovered was found to act through a reactive oxygen species independent, uncompetitive mechanism with an IC50 of 250 nm. We show the crucial role of halogens in the common scaffold to provide potency and selectivity of our compound, where the introduction of the fluorine atom completely switches the selectivity of the inhibitor between USP2 and USP7. Our cellular studies highlight the potential applicability of the reported compound for in vivo experiments. The discovery of the isoquinoline-1,3-dione core and the knowledge obtained with regard to halogen substituents provide a platform towards understanding USP2 inhibition and the development of highly selective next-generation deubiquitinase inhibitors.
Collapse
Affiliation(s)
- Ganga B Vamisetti
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 3200008, Israel
| | - Roman Meledin
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 3200008, Israel
| | - Pushparathinam Gopinath
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 3200008, Israel
| | - Ashraf Brik
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 3200008, Israel
| |
Collapse
|
12
|
Vamisetti GB, Chowdhury R, Ghosh SK. Organocatalytic decarboxylative aldol reaction of β-ketoacids with α-ketophosphonates en route to the enantioselective synthesis of tertiary α-hydroxyphosphonates. Org Biomol Chem 2017; 15:3869-3873. [DOI: 10.1039/c7ob00796e] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
γ-Aroyl tertiary α-hydroxyphosphonates with a chiral quaternary centre were synthesized via a facile organocatalyzed decarboxylative aldol reaction between β-ketoacids and α-ketophosphonates.
Collapse
Affiliation(s)
- Ganga B. Vamisetti
- Bio-Organic Division
- Bhabha Atomic Research Centre
- Mumbai 400085
- India
- Homi Bhabha National Institute
| | | | - Sunil K. Ghosh
- Bio-Organic Division
- Bhabha Atomic Research Centre
- Mumbai 400085
- India
- Homi Bhabha National Institute
| |
Collapse
|
13
|
Vamisetti GB, Chowdhury R, Kumar M, Ghosh SK. “On Water” Organocatalyzed [4 + 2] Cycloaddition of Enones and Nitro Dienes for the Enantioselective Synthesis of Densely Substituted Cyclohexanones. Org Lett 2016; 18:1964-7. [DOI: 10.1021/acs.orglett.6b00460] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ganga B. Vamisetti
- Bio-Organic
Division, Bhabha Atomic Research Centre, Trombay, Mumbai 40008, India
| | - Raghunath Chowdhury
- Bio-Organic
Division, Bhabha Atomic Research Centre, Trombay, Mumbai 40008, India
| | - Mukesh Kumar
- Solid
State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Sunil K. Ghosh
- Bio-Organic
Division, Bhabha Atomic Research Centre, Trombay, Mumbai 40008, India
| |
Collapse
|