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Kato K, Ikeuchi K, Suzuki T, Tanino K. Total Synthesis of 2-Isocyanoallopupukeanane: Construction of Caged Skeleton by Intramolecular Alkylation of Bromonitriles. Org Lett 2022; 24:6407-6411. [PMID: 36017948 DOI: 10.1021/acs.orglett.2c02434] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new method for constructing the bicyclo[3.2.1]octane skeleton was developed by the intramolecular alkylation of a nitrile-side-chain-containing cyclohexanone derivative. The cyclization precursors were prepared via the stereoselective bromination of the triisopropylsilyl enol ethers of 4-substituted cyclohexanones. Upon treatment with LiNEt2, the bromonitriles underwent a stereoselective intramolecular SN2 reaction to afford bicyclo[3.2.1]octane derivatives with a cyano group on the convex face. The total synthesis of 2-isocyanoallopupukeanane (6.5% yield) from methyl vinyl ketone was accomplished via a 17-step transformation.
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Affiliation(s)
- Kosuke Kato
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-0810, Japan
| | - Kazutada Ikeuchi
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Takahiro Suzuki
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Keiji Tanino
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
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2
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Mohammadpoor-Baltork I, Khosropour AR, Aliyan H. A Convenient and Chemoselective Acetylation and Formylation of Alcohols and Phenols Using Acetic Acid and Ethyl Formate in the Presence of Bi(III) Salts. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/030823401103169775] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A variety of alcohols are acetylated and formylated efficiently with acetic acid and ethyl formate in the presence of catalytic amounts of Bi(III) salts such as BiCl3, Bi(TFA)3 and Bi(OTf)3. BiCl3 and Bi(OTf)3 are also effective catalysts for acetylation of phenols. All of these catalysts are ineffective in formylation of phenols. Selective acetylation and formylation of alcohols in the presence of phenols is an additional advantage of this procedure.
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Affiliation(s)
| | | | - Hamid Aliyan
- Department of Chemistry, Isfahan University, Isfahan 81744, Iran
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Chapman RS, Francis M, Lawrence R, Tibbetts JD, Bull SD. Formyloxyacetoxyphenylmethane and 1,1-diacylals as versatile O-formylating and O-acylating reagents for alcohols. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.09.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Christensen SB, Hansen AM, Franzyk H. On-resin N-formylation of peptides: a head-to-head comparison of reagents in solid-phase synthesis of ligands for formyl peptide receptors. J Pept Sci 2017; 23:410-415. [PMID: 28421689 DOI: 10.1002/psc.2998] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 03/02/2017] [Accepted: 03/03/2017] [Indexed: 11/10/2022]
Abstract
4-Nitrophenyl formate was found to be the most convenient reagent in solid-phase formylation of peptides with a high formylation degree within 20 min to 3 h depending on reaction temperature and length of peptide.
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Affiliation(s)
- Simon Bendt Christensen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 162, DK-2100, Copenhagen, Denmark
| | - Anna Mette Hansen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 162, DK-2100, Copenhagen, Denmark
| | - Henrik Franzyk
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 162, DK-2100, Copenhagen, Denmark
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Enoua GC, Lahm G, Uray G, Stadlbauer W. Syntheses and Fluorescent Properties of 6-Methoxy-2-oxoquinoline-3,4-dicarbonitriles and 6,7-Dimethoxy-2-oxoquinoline-3,4-dicarbonitriles. J Heterocycl Chem 2014. [DOI: 10.1002/jhet.1865] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Guy Crépin Enoua
- Department of Chemistry, Organic Synthesis Group; Karl-Franzens University of Graz; Heinrichstrasse 28 A-8010 Graz Austria
| | - Günther Lahm
- Department of Chemistry, Organic Synthesis Group; Karl-Franzens University of Graz; Heinrichstrasse 28 A-8010 Graz Austria
| | - Georg Uray
- Department of Chemistry, Organic Synthesis Group; Karl-Franzens University of Graz; Heinrichstrasse 28 A-8010 Graz Austria
| | - Wolfgang Stadlbauer
- Department of Chemistry, Organic Synthesis Group; Karl-Franzens University of Graz; Heinrichstrasse 28 A-8010 Graz Austria
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Habibi D, Nasrollahzadeh M, Sahebekhtiari H. Green synthesis of formamides using the Natrolite zeolite as a natural, efficient and recyclable catalyst. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcata.2013.04.001] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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7
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Synthesis and antihormonal properties of novel 11β-benzoxazole-substituted steroids. Bioorg Med Chem Lett 2011; 22:1705-8. [PMID: 22260770 DOI: 10.1016/j.bmcl.2011.12.110] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Revised: 12/20/2011] [Accepted: 12/21/2011] [Indexed: 11/22/2022]
Abstract
Early studies led to the identification of 11β-aryl-4',5'-dihydrospiro[estra-4,9-diene-17β,4'-oxazole] analogs with potent and more selective antiprogestational activity compared to antiglucocorticoid activity than mifepristone. In the present study, we replaced the 4'-dimethylaminophenyl group of mifepristone with the benzoxazol group to give 5a-d. We also prepared the 17β-formamido analogs 6a,b using a new synthetic strategy via the intermediate epoxide 21. These compounds were evaluated for their antagonist hormonal properties using the T47D cell-based alkaline phosphatase assay and the A549 cell-based functional assay. Compound 5c showed potent antagonist activity at GR with better selectivity for GR versus PR than mifepristone and is a promising lead for further development.
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Yeo SH, Seo HJ, Lim DY. Synthesis of Halicylindramide A Mimetics Containing Lactone Isosteres. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.8.2916] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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AMIN R, ARDESHIR K, HEIDAR ALI AN, ZAHRA TR. Formylation of Alcohol with Formic Acid under Solvent-Free and Neutral Conditions Catalyzed by Free I2 or I2 Generated in situ from Fe(NO3)3·9H2O/NaI. CHINESE JOURNAL OF CATALYSIS 2011. [DOI: 10.1016/s1872-2067(10)60160-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Affiliation(s)
- Hyunju Seo
- Department of Chemistry, Sejong University, Seoul 143-747, South Korea
| | - Dongyeol Lim
- Department of Chemistry, Sejong University, Seoul 143-747, South Korea
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Firouzabadi H, Iranpoor N, Farahi S. Solid trichlorotitanium(IV) trifluoromethanesulfonate TiCl3(OTf) catalyzed efficient acylation of –OH and –SH: Direct esterification of alcohols with carboxylic acids and transesterification of alcohols with esters under neat conditions. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.molcata.2008.04.010] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Newton GL, Ta P, Fahey RC. A mycothiol synthase mutant of Mycobacterium smegmatis produces novel thiols and has an altered thiol redox status. J Bacteriol 2005; 187:7309-16. [PMID: 16237013 PMCID: PMC1272995 DOI: 10.1128/jb.187.21.7309-7316.2005] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Mycobacteria and other actinomycetes do not produce glutathione but make mycothiol (MSH; AcCys-GlcN-Ins) that has functions similar to those of glutathione and is essential for growth of Mycobacterium tuberculosis. Mycothiol synthase (MshD) catalyzes N acetylation of Cys-GlcN-Ins to produce MSH in Mycobacterium smegmatis mc2155, and Cys-GlcN-Ins is maintained at a low level. The mycothiol synthase mutant, the mshD::Tn5 mutant, produces high levels of Cys-GlcN-Ins along with two novel thiols, N-formyl-Cys-GlcN-Ins and N-succinyl-Cys-GlcN-Ins, and a small amount of MSH. The nonenzymatic reaction of acyl-coenzyme A (CoA) with Cys-GlcN-Ins to produce acyl-Cys-GlcN-Ins is a facile reaction under physiologic conditions, with succinyl-CoA being an order of magnitude more reactive than acetyl-CoA. The uncatalyzed reaction rates are adequate to account for the observed production of N-succinyl-Cys-GlcN-Ins and MSH under physiologic conditions. It was shown that the N-acyl-Cys-GlcN-Ins compounds are maintained in a substantially reduced state in the mutant but that Cys-GlcN-Ins exists in disulfide forms at 5 to 40% at different stages of growth. MSH was able to facilitate reduction of N-succinyl-Cys-GlcN-Ins disulfide through thiol-disulfide exchange, but N-formyl-Cys-GlcN-Ins was ineffective. The oxidized state of Cys-GlcN-Ins in cells appears to result from a high susceptibility to autoxidation and a low capacity of the cell to reduce its disulfide forms. The mutant exhibited no enhanced sensitivity to hydrogen peroxide, tert-butyl hydroperoxide, or cumene hydroperoxide relative to the parent strain, suggesting that the most abundant thiol, N-formyl-Cys-GlcN-Ins, functions as a substitute for MSH.
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Affiliation(s)
- Gerald L Newton
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0314, USA
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Hill DR, Hsiao CN, Kurukulasuriya R, Wittenberger SJ. 2,2,2-trifluoroethyl formate: a versatile and selective reagent for the formylation of alcohols, amines, and N-hydroxylamines. Org Lett 2002; 4:111-3. [PMID: 11772103 DOI: 10.1021/ol016976d] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Treatment of a variety of alcohols, amines, and N-hydroxylamines with 2,2,2-trifluoroethyl formate gave the corresponding formylated adducts in high yields.
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Affiliation(s)
- David R Hill
- Abbott Laboratories, Global Pharmaceutical R&D, 1401 Sheridan Road, D-R450, Bldg. R8, North Chicago, Illinois 60064-4000, USA.
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Chakrabarty M, Khasnobis S, Harigaya Y, Konda Y. Neat Formic Acid: an ExcellentN-Formylating Agent for Carbazoles, 3-Alkylindoles, Diphenylamine and Moderately Weak Nucleophilic Anilines. SYNTHETIC COMMUN 2000. [DOI: 10.1080/00397910008087310] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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17
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Orelli LR, Garcia MB, Niemevz F, Perillo IA. Selective Monoformylation Of 1,3-Diaminopropane Derivatives. SYNTHETIC COMMUN 1999. [DOI: 10.1080/00397919908086172] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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18
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Iranpoor N, Firouzabadi H, Zolfigol MA. Selective Acetylation of Primary Alcohols: Acetyl and Formyl Transfer Reactions with Copper(II) Salts. SYNTHETIC COMMUN 1998. [DOI: 10.1080/00397919808007166] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Suri SC, Rodgers SL, Radhakrishnan KV, Nair V. DMF As a Formate Anion Equivalent: Formolysis of Tosylates in Aqueous DMF1. SYNTHETIC COMMUN 1996. [DOI: 10.1080/00397919608003708] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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