1
|
Smith BP, Truax NJ, Pollatos AS, Meanwell M, Bedekar P, Garrido-Castro AF, Baran PS. Total Synthesis of Dragocins A-C through Electrochemical Cyclization. Angew Chem Int Ed Engl 2024; 63:e202401107. [PMID: 38358802 DOI: 10.1002/anie.202401107] [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] [Received: 01/16/2024] [Revised: 02/14/2024] [Accepted: 02/15/2024] [Indexed: 02/16/2024]
Abstract
The first total synthesis of dragocins A-C, remarkable natural products containing an unusual C4' oxidized ribose architecture bridged by a polyhydroxylated pyrrolidine, is presented through a route featuring a number of uncommon maneuvers. Several generations towards the target molecules are presented, including the spectacular failure of a key C-H oxidation on a late-stage intermediate. The final route features rapid, stereocontrolled access to a densely functionalized pyrrolidine and an unprecedented diastereoselective oxidative electrochemical cyclization to forge the hallmark 9-membered ring. Preliminary studies suggest this electrochemical oxidation protocol is generally useful.
Collapse
Affiliation(s)
- Brendyn P Smith
- Department of Chemistry, Scripps Research, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States
| | - Nathanyal J Truax
- Department of Chemistry, Scripps Research, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States
| | - Alexandros S Pollatos
- Department of Chemistry, Scripps Research, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States
| | - Michael Meanwell
- Department of Chemistry, Scripps Research, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Dr NW, Edmonton, AB T6G 2N4, Canada
| | - Pranali Bedekar
- Department of Chemistry, Scripps Research, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States
| | - Alberto F Garrido-Castro
- Department of Chemistry, Scripps Research, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States
- Laboratorium für Organische Chemie, ETH Zürich, Vladimir-Prelog-Weg 3, HCI, 8093, Zürich, Switzerland
| | - Phil S Baran
- Department of Chemistry, Scripps Research, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States
| |
Collapse
|
2
|
Gore B, Chen CC, Lin PY, Wang JJ. Photochemical Radical Bicyclization of 1,5-Enynes: Divergent Synthesis of Fluorenes and Azepinones. Org Lett 2024; 26:757-762. [PMID: 38231886 PMCID: PMC10825824 DOI: 10.1021/acs.orglett.3c04246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 01/10/2024] [Accepted: 01/11/2024] [Indexed: 01/19/2024]
Abstract
A dual nickel- and iridium-photocatalyzed radical cascade bicyclization reaction for the synthesis of highly complex molecular structures in an atom- and step-economic manner has been described. A series of radical precursors are utilized for the divergent synthesis of diversely substituted fluorenes and indenoazepinones bearing quaternary carbons by using cascade cyclization reactions of 1,5-enynes. This reaction is characterized by its mild conditions, broad substrate scope, excellent selectivity, and satisfactory yield including facile scale-up synthesis.
Collapse
Affiliation(s)
- Babasaheb
Sopan Gore
- Department
of Medicinal and Applied Chemistry, Kaohsiung
Medical University, No. 100, Shih-Chuan First Rd, Sanmin District, Kaohsiung City 807, Taiwan
| | - Chun-Cheng Chen
- Department
of Medicinal and Applied Chemistry, Kaohsiung
Medical University, No. 100, Shih-Chuan First Rd, Sanmin District, Kaohsiung City 807, Taiwan
| | - Ping-Yu Lin
- Department
of Medicinal and Applied Chemistry, Kaohsiung
Medical University, No. 100, Shih-Chuan First Rd, Sanmin District, Kaohsiung City 807, Taiwan
| | - Jeh-Jeng Wang
- Department
of Medicinal and Applied Chemistry, Kaohsiung
Medical University, No. 100, Shih-Chuan First Rd, Sanmin District, Kaohsiung City 807, Taiwan
- Department
of Medical Research, Kaohsiung Medical University
Hospital, No. 100, Tzyou
First Rd, Sanmin District, Kaohsiung City 807, Taiwan
| |
Collapse
|
3
|
Šlachtová V, Casaretto N, Brulíková L, Six Y. Bicyclic N-dihalocyclopropylamide derivatives as precursors of nitrogen-containing fused polycyclic systems. Org Biomol Chem 2023; 21:6325-6341. [PMID: 37337777 DOI: 10.1039/d3ob00643c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/21/2023]
Abstract
Examples of carbon-carbon bond-forming cyclisation reactions, involving allyl cations generated by the thermal ring-opening of halocyclopropanes, have been scarcely reported. In this contribution, we are describing the results of a study conducted with N-dihalocyclopropylamide substrates, designed as precursors of cyclic iminium intermediates that were aimed at participating in intramolecular reactions with electron-rich aromatic groups. Competitive side-reactions were identified, and access to the desired polycyclic products was carefully evaluated. The results were found to be strongly dependent on the substitution pattern of the nucleophilic aromatic moieties, as well as on the sizes of the rings of the target products. In spite of the rather moderate yields generally obtained, this approach represents a particularly short and inexpensive route to various interesting nitrogen-containing polycyclic systems, namely benzoindolizidine, benzoquinolizidine, piperidinobenzoazepane and azepanoisoquinoline compounds.
Collapse
Affiliation(s)
- Veronika Šlachtová
- Department of Organic Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 12, 771 46, Olomouc, Czech Republic
| | - Nicolas Casaretto
- Laboratoire de Chimie Moléculaire (LCM), UMR 9168 CNRS/École Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau Cedex, France
| | - Lucie Brulíková
- Department of Organic Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 12, 771 46, Olomouc, Czech Republic
| | - Yvan Six
- Laboratoire de Synthèse Organique (LSO), UMR 7652 CNRS/ENSTA/École Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau Cedex, France.
| |
Collapse
|
4
|
Mechanistic aspects of the Diels-Alder reaction between (E)-N-benzylidene-2,2-difluoro-1-phenylethenamine and 2-vinyl pyridine: A molecular electron density theory study. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113817] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
|
5
|
Xie F, Li X, Xu L, Ma J, Sun L, Zhang B, Lin B, Cheng M, Liu Y. Diels‐Alder Cycloaddition of Azepino[4,5‐b]indoles towards Hydrocarbazole Derivatives and Related Heterocycles. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202101401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Fukai Xie
- Shenyang Pharmaceutical University CHINA
| | - Xiang Li
- Shenyang Pharmaceutical University CHINA
| | - Liangyu Xu
- Shenyang Pharmaceutical University CHINA
| | - Jun Ma
- Shenyang Pharmaceutical University CHINA
| | - Lei Sun
- Shenyang Pharmaceutical University CHINA
| | - Bo Zhang
- Shenyang Pharmaceutical University CHINA
| | - Bin Lin
- Shenyang Pharmaceutical University CHINA
| | | | | |
Collapse
|
6
|
Soleymani M, Chegeni M, Mohammadi E. BF3-catalyzed oxa-Diels–Alder reaction of ethyl vinyl sulfide and β-methyl-α-phenylacrolein: a molecular electron density theory study. MONATSHEFTE FUR CHEMIE 2021. [DOI: 10.1007/s00706-021-02841-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|
7
|
Gabbutt CD, Heron BM, Lilly T, Ogwang OW, Zonidis D. Synthesis, C-H bond functionalisation and cycloadditions of 6-styryl-1,2-oxathiine 2,2-dioxides. Org Biomol Chem 2021; 19:6431-6446. [PMID: 34231619 DOI: 10.1039/d1ob01125a] [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
A series of 6-styryl-1,2-oxathiine 2,2-dioxides have been efficiently obtained by a two-step protocol from readily available (1E,4E)-1-(dimethylamino)-5-arylpenta-1,4-dien-3-ones involving a regioselective sulfene addition and subsequent Cope elimination. Pd-Mediated direct C-H bond functionalisation of the 6-styryl-1,2-oxathiine 2,2-dioxides and a wider selection of 5,6-diaryl substituted 1,2-oxathiine 2,2-dioxides proceeded smoothly to afford C-3 (hetero)aryl substituted analogues and the results are contrasted with those of a complementary bromination - Suzuki cross-coupling sequence. Whilst the cycloaddition of benzyne, derived from in situ fluoride initiated decomposition of 2-(trimethylsilyl)phenyl trifluoromethanesulfonate, to the substituted 1,2-oxathiine 2,2-dioxides resulted in low yields of substituted naphthalenes, the addition of 4-phenyl-1,2,4-triazoline-3,5-dione to the 6-styryl-1,2-oxathiine 2,2-dioxides afforded novel 5,9-dihydro-1H-[1,2]oxathiino[5,6-c][1,2,4]triazolo[1,2-a]pyridazine-1,3(2H)-dione 8,8-dioxides through a silica-mediated isomerisation of the initial [4 + 2] adducts.
Collapse
Affiliation(s)
- Christopher D Gabbutt
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield, HD1 3DH, UK.
| | - B Mark Heron
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield, HD1 3DH, UK.
| | - Thomas Lilly
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield, HD1 3DH, UK.
| | - Ochola W Ogwang
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield, HD1 3DH, UK.
| | - Dimitrios Zonidis
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield, HD1 3DH, UK.
| |
Collapse
|