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Sugunan A, Aparna VM, Rajendar G. Phosphonium Ion-Tethered Secondary Amines for Chemospecific 5- Enolexo Aldol Condensations of 6-Ketoaldehydes. J Org Chem 2023. [PMID: 38014421 DOI: 10.1021/acs.joc.3c02285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
A novel and highly selective 5-enolexo-exo-trig aldol condensation of 6-ketoaldehydes is presented using a proline-based alkylphosphonium ion catalyst. Bulky and oxophilic phosphonium ion plays a vital role in facilitating kinetic aldenamine formation and activating keto groups for aldol addition. This innovative approach exclusively targets five-membered carbo- and heterocyclic aldehydes, involving unusual aldehydes as donors and ketones as acceptors. Especially, enolizable aryl keto aldehydes and heteroatom-embedded ketoaldehydes exclusively produced cyclized products with our new catalyst, while other catalysts provided predominantly self-aldol or decomposed products. The scope and diversity of the method demonstrated by synthesizing different carboxaldehydes, including cyclopentene, indene, dihydrofuran, benzofuran, dihydropyrrole, indole, thiofuran, dihydrothiofuran, and benzothiofurans.
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Affiliation(s)
- Akash Sugunan
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala 695551, India
| | - V M Aparna
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala 695551, India
| | - Goreti Rajendar
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala 695551, India
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Wang DM, She LQ, Yuan H, Wu Y, Tang Y, Wang P. Ligand-Enabled Ni II -Catalyzed Hydroxylarylation of Alkenes with Molecular Oxygen. Angew Chem Int Ed Engl 2023; 62:e202304573. [PMID: 37431727 DOI: 10.1002/anie.202304573] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 07/10/2023] [Accepted: 07/11/2023] [Indexed: 07/12/2023]
Abstract
The use of molecular oxygen as the terminal oxidant in transition metal catalyzed oxidative process is an appealing and challenging task in organic synthetic chemistry. Here, we report a Ni-catalyzed hydroxylarylation of unactivated alkenes enabled by a β-diketone ligand with high efficiency and excellent regioselectivity employing molecular oxygen as the oxidant and hydroxyl source. This reaction features mild conditions, broad substrate scope and incredible heterocycle compatibility, providing a variety of β-hydroxylamides, γ-hydroxylamides, β-aminoalcohols, γ-aminoalcohols, and 1,3-diols in high yields. The synthetic value of this methodology was demonstrated by the efficient synthesis of two bioactive compounds, (±)-3'-methoxyl citreochlorol and tea catechin metabolites M4.
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Affiliation(s)
- Dao-Ming Wang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, 345 Lingling Road, Shanghai, 200032, P. R. China
- Chang-Kung Chuang Institute, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Lu, Shanghai, 200062, P. R. China
| | - Li-Qin She
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, 345 Lingling Road, Shanghai, 200032, P. R. China
| | - Hao Yuan
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, 345 Lingling Road, Shanghai, 200032, P. R. China
| | - Yichen Wu
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, 345 Lingling Road, Shanghai, 200032, P. R. China
| | - Yong Tang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, 345 Lingling Road, Shanghai, 200032, P. R. China
- Chang-Kung Chuang Institute, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Lu, Shanghai, 200062, P. R. China
| | - Peng Wang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, 345 Lingling Road, Shanghai, 200032, P. R. China
- School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou, 310024, P. R. China
- CAS Key Laboratory of Energy Regulation Materials, Shanghai Institute of Organic Chemistry, CAS, 345 Lingling Road, Shanghai, 200032, P. R. China
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Yang S, Liu C, Shangguan X, Li Y, Zhang Q. A copper-catalyzed four-component reaction of arylcyclopropanes, nitriles, carboxylic acids and N-fluorobenzenesulfonimide: facile synthesis of imide derivatives. Chem Sci 2022; 13:13117-13121. [PMID: 36425490 PMCID: PMC9667929 DOI: 10.1039/d2sc04913a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Accepted: 10/26/2022] [Indexed: 07/21/2023] Open
Abstract
An unprecedented copper-catalyzed four-component reaction of arylcyclopropanes, nitriles, carboxylic acids and N-fluorobenzenesulfonimide (NFSI) has been successfully developed, which represents the first example of a four-component reaction of non-donor-acceptor cyclopropanes. A wide range of imide derivatives were efficiently synthesized in excellent yields under mild conditions.
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Affiliation(s)
- Shengbiao Yang
- Key Laboratory of Functional Organic Molecule Design & Synthesis of Jilin Province, Department of Chemistry, Northeast Normal University Changchun Jilin 130024 China
- Heze Branch, Qilu University of Technology (Shandong Academy of Sciences), Biological Engineering Technology Innovation Center of Shandong Province 274000 China
| | - Chunyang Liu
- Key Laboratory of Functional Organic Molecule Design & Synthesis of Jilin Province, Department of Chemistry, Northeast Normal University Changchun Jilin 130024 China
| | - Xiaoyan Shangguan
- Key Laboratory of Functional Organic Molecule Design & Synthesis of Jilin Province, Department of Chemistry, Northeast Normal University Changchun Jilin 130024 China
| | - Yan Li
- Key Laboratory of Functional Organic Molecule Design & Synthesis of Jilin Province, Department of Chemistry, Northeast Normal University Changchun Jilin 130024 China
| | - Qian Zhang
- Key Laboratory of Functional Organic Molecule Design & Synthesis of Jilin Province, Department of Chemistry, Northeast Normal University Changchun Jilin 130024 China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences Shanghai 200032 China
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Lin CK, Hsieh BH, Wu CF. Total Synthesis of Citreochlorol Monochloro Analogues via a Catalytically Enantioselective Carbonyl Allylation. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1669-0463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
AbstractAn efficient synthetic route to citreochlorol analogues, halogenated polyketide secondary metabolites, is described. The key features are Krische’s enantioselective carbonyl allylation, IBr-promoted cyclization, and regioselective epoxide opening. The importance of the route lies in accessing a versatile epoxy ether that enables the formation of citreochlorol monochloro derivatives.
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Rehman M, Surendran S, Siddavatam N, Rajendar G. The influence of α-coordinating groups of aldehydes on E/ Z-selectivity and the use of quaternary ammonium counter ions for enhanced E-selectivity in the Julia-Kocienski reaction. Org Biomol Chem 2022; 20:329-333. [PMID: 34897359 DOI: 10.1039/d1ob02126e] [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
Modified reaction conditions for improved E-selectivity of olefins in the Julia-Kocienski reaction of aldehydes having α-coordinating substituents are demonstrated. The chelating groups in aldehydes are expected to stabilize the syn-transition state with metal ions, whereas the weakly coordinating quaternary ammonium ions are devoid of all possible chelating interactions to enhance E-selectivity. A systematic investigation is presented to study the size of the neighbouring protecting groups of aldehydes and their chelation effect on E/Z-selectivity in the Julia-Kocienski reaction.
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Affiliation(s)
- Mintu Rehman
- 2204, School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Vithura, Kerala, 695551, India.
| | - Sravya Surendran
- 2204, School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Vithura, Kerala, 695551, India.
| | - Nagendra Siddavatam
- 2204, School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Vithura, Kerala, 695551, India.
| | - Goreti Rajendar
- 2204, School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Vithura, Kerala, 695551, India.
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Sunnapu R, Rajendar G. A Concise Stereoselective Total Synthesis of Methoxyl Citreochlorols and Their Structural Revisions. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001563] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ranganayakulu Sunnapu
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Vithura 2209 Trivandrum, Kerala 695551 India
| | - Goreti Rajendar
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Vithura 2209 Trivandrum, Kerala 695551 India
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