1
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Zhao MX, Xiang J, Zhao ZQ, Zhao XL, Shi M. Asymmetric synthesis of dihydrocoumarins via catalytic sequential 1,6-addition/transesterification of α-isocyanoacetates with para-quinone methides. Org Biomol Chem 2020; 18:1637-1646. [DOI: 10.1039/c9ob02652e] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dihydroquinidine-derived aminophosphine/AgNO3 catalyzed asymmetric tandem 1,6-addition/transesterification of α-isocyanoacetates with o-hydroxyphenyl-substituted p-QMs was developed.
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Affiliation(s)
- Mei-Xin Zhao
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry and Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Juan Xiang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry and Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Zi-Qiang Zhao
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry and Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Xiao-Li Zhao
- Department of Chemistry
- East China Normal University
- Shanghai
- China
| | - Min Shi
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry and Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
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2
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Lv D, Zhao M, Wang Y, Zhou Z. 3-Nitro-3,4-dihydrocoumarins: valuable precursors for the synthesis of enantiomerically enriched masked quaternary α-amino acid derivatives with a 3,4-dihydrocoumarin scaffold. Org Biomol Chem 2019; 17:9636-9645. [PMID: 31670332 DOI: 10.1039/c9ob02089f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A bifunctional squaramide catalyzed enantioselective formal [2 + 4] annulation reaction with 3-nitro-3,4-dihydrocoumarins and ortho-quinone methide has been developed. Novel chiral masked quaternary α-amino acid derivatives with a 3,4-dihydrocoumarin scaffold are obtained in a highly stereocontrolled manner. Representative transformation of the annulation product to a biologically important quaternary α-amino acid derivative is achieved without any appreciable loss in the diastereo- and enantioselectivity.
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Affiliation(s)
- Dan Lv
- Institute and State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, P. R. China.
| | - Min Zhao
- Institute and State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, P. R. China.
| | - Youming Wang
- Institute and State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, P. R. China.
| | - Zhenghong Zhou
- Institute and State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, P. R. China.
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3
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Ma J, Šekutor M, Škalamera Đ, Basarić N, Phillips DL. Formation of Quinone Methides by Ultrafast Photodeamination: A Spectroscopic and Computational Study. J Org Chem 2019; 84:8630-8637. [PMID: 31244153 DOI: 10.1021/acs.joc.9b01085] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Formation of quinone methides (QMs) by photoelimination of an ammonium salt from cresol derivatives was investigated by femtosecond transient absorption spectroscopy (fs-TA) and computationally by time-dependent density functional theory using the PCM(water)/(TD-)B3LYP/6-311++G(d,p) level of theory. The photoelimination takes place in an adiabatic ultrafast reaction on the S1 potential energy surface delivering the corresponding QMs(S1), which were detected by fs-TA. Computations predicted a high-energy cation intermediate in the pathway between the Franck-Condon state of a monoammonium salt and the corresponding QM(S1) that was not detected by fs-TA. On the other hand, elimination from a disalt in H2O takes place in one step, giving directly the QM(S1). The combined experimental and theoretical investigation fully disclosed the formation of QMs by the deamination reaction mechanism, which is important in the application of cresols or similar molecules in biological systems.
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Affiliation(s)
- Jiani Ma
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science , Northwest University , Xi'an 710065 , P. R. China
| | - Marina Šekutor
- Department of Organic Chemistry and Biochemistry , Ruđer Bošković Institute , Bijenička cesta 54 , 10 000 Zagreb , Croatia
| | - Đani Škalamera
- Department of Organic Chemistry and Biochemistry , Ruđer Bošković Institute , Bijenička cesta 54 , 10 000 Zagreb , Croatia
| | - Nikola Basarić
- Department of Organic Chemistry and Biochemistry , Ruđer Bošković Institute , Bijenička cesta 54 , 10 000 Zagreb , Croatia
| | - David Lee Phillips
- Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , Hong Kong S.A.R. , P. R. China
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4
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Ruan S, Lin X, Xie L, Lin L, Feng X, Liu X. Asymmetric synthesis of 3-aminodihydrocoumarins via the chiral guanidine catalyzed cascade reaction of azlactones. Org Chem Front 2018. [DOI: 10.1039/c7qo00768j] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A new asymmetric preparative method of 3-aminodihydrocoumarins via reactions of azlactones and 2-nitrovinylphenols using chiral bifunctional guanidine catalysts.
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Affiliation(s)
- Sai Ruan
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Xiaobin Lin
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Lihua Xie
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
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5
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Zhang ZP, Xie KX, Yang C, Li M, Li X. Asymmetric Synthesis of Dihydrocoumarins through Chiral Phosphoric Acid-Catalyzed Cycloannulation of para-Quinone Methides and Azlactones. J Org Chem 2017; 83:364-373. [DOI: 10.1021/acs.joc.7b02750] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Zhi-Pei Zhang
- State key Laboratory of Elemento-Organic
Chemistry, College of Chemistry, Collaborative Innovation Center of
Chemical Science and Engineering, Nankai University, Tianjin 300071, China
| | - Kai-Xue Xie
- State key Laboratory of Elemento-Organic
Chemistry, College of Chemistry, Collaborative Innovation Center of
Chemical Science and Engineering, Nankai University, Tianjin 300071, China
| | - Chen Yang
- State key Laboratory of Elemento-Organic
Chemistry, College of Chemistry, Collaborative Innovation Center of
Chemical Science and Engineering, Nankai University, Tianjin 300071, China
| | - Man Li
- State key Laboratory of Elemento-Organic
Chemistry, College of Chemistry, Collaborative Innovation Center of
Chemical Science and Engineering, Nankai University, Tianjin 300071, China
| | - Xin Li
- State key Laboratory of Elemento-Organic
Chemistry, College of Chemistry, Collaborative Innovation Center of
Chemical Science and Engineering, Nankai University, Tianjin 300071, China
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6
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Chandrasekhar DB, Tsay SC, Pradhan TK, Hwu JR. Syntheses of Chroman-2-ones and α-Amino Acids through a Diastereoselective Domino Reaction. J Org Chem 2017; 82:5524-5537. [DOI: 10.1021/acs.joc.7b00260] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- D. Balaji Chandrasekhar
- Department of Chemistry and Frontier Research Center on Fundamental & Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Shwu-Chen Tsay
- Department of Chemistry and Frontier Research Center on Fundamental & Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Tapan K. Pradhan
- Department of Chemistry and Frontier Research Center on Fundamental & Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Jih Ru Hwu
- Department of Chemistry and Frontier Research Center on Fundamental & Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
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7
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Kralj M, Uzelac L, Wang YH, Wan P, Tireli M, Mlinarić-Majerski K, Piantanida I, Basarić N. Enhancement of antiproliferative activity by phototautomerization of anthrylphenols. Photochem Photobiol Sci 2016; 14:1082-92. [PMID: 25850014 DOI: 10.1039/c5pp00099h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
An antiproliferative investigation was conducted on 3 human cancer cell lines, HCT 116 (colon), MCF-7 (breast), and H 460 (lung), on a series of 4 anthrylphenols in the dark and upon exposure to light (350 nm). 9-(2-Hydroxyphenyl)anthracene (1) moderately inhibited proliferation, but irradiation considerably enhanced the effect. The other anthracenes 4–6 exhibited antiproliferative activity in the dark, which was not enhanced upon irradiation. The enhancement of the antiproliferative effect on the irradiation of 1 was rationalized as being due to the formation of quinone methide (QM 2) by excited state proton transfer. QM 2 acts as an electrophilic species capable of reacting with biological molecules. Although QM 2 reacts with nucleotides, the adducts could not be isolated. On the contrary, cysteine adduct 8 was isolated and characterized, whereas the adducts with glycine, serine and tripeptide glutathione were characterized by MS. Non-covalent binding of 1 to DNA and bovine serum albumin was demonstrated by UV-vis, fluorescence and CD spectroscopy. However, a straightforward conclusion regarding the DNA or protein alkylating (damaging) ability of 2 could not be drawn. The results obtained by the irradiation of 1 in the presence of DNA, amino acids and peptides, cell cycle perturbation analysis, and in vitro translation of GFP suggest that the effect is not only due to the damage of DNA but also due to the impact on the cellular proteins. Considering that to date all QM agents were assumed to target DNA dominantly, this is an important finding with an impact on the further development of anticancer agents based on QMs.
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Affiliation(s)
- Marijeta Kralj
- Department of Molecular Medicine, Ruđer Bošković Institute, Bijenička cesta 54, 10 000 Zagreb, Croatia.
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8
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Hu H, Liu Y, Guo J, Lin L, Xu Y, Liu X, Feng X. Enantioselective synthesis of dihydrocoumarin derivatives by chiral scandium(III)-complex catalyzed inverse-electron-demand hetero-Diels-Alder reaction. Chem Commun (Camb) 2015; 51:3835-7. [PMID: 25649623 DOI: 10.1039/c4cc10343b] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
An asymmetric inverse-electron-demand hetero-Diels-Alder reaction between o-quinone methides and azlactones to generate potentially pharmacological active dihydrocoumarins has been achieved efficiently by using a chiral N,N'-dioxide-Sc(III) complex as the catalyst. The desired products were obtained in high yields with excellent enantioselectivities and diastereoselectivities (up to 94% yield, 96% ee and >19 : 1 dr) under mild reaction conditions. A concerted reaction pathway was confirmed by Operando IR and control experiments.
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Affiliation(s)
- Haipeng Hu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China.
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9
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Kamat DP, Tilve SG, Kamat VP, Kirtany JK. Syntheses and Biological Activities of Chroman-2-ones. A Review. ORG PREP PROCED INT 2015. [DOI: 10.1080/00304948.2015.983805] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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10
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Škalamera Đ, Mlinarić-Majerski K, Martin-Kleiner I, Kralj M, Wan P, Basarić N. Near-visible light generation of a quinone methide from 3-hydroxymethyl-2-anthrol. J Org Chem 2014; 79:4390-7. [PMID: 24758707 DOI: 10.1021/jo500290y] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Excitation of 2-hydroxy-3-(diphenylhydroxymethyl)anthracene (7) to S1 initiates photodehydration, giving the corresponding quinone methide (QM) that was detected by laser flash photolysis (LFP) in 2,2,2-trifluoroethanol (λ = 580 nm, τ = 690 ± 10 ns). The QM decays by protonation, giving a cation (λ = 520 nm, τ = 84 ± 3 μs), which subsequently reacts with nucleophiles. The rate constants in the reactions with nucleophiles were determined by LFP, whereas the adducts were isolated via preparative photolyses. The photogeneration of QMs in the anthrol series is important for potential use in biological systems since the chromophore absorbs at wavelengths > 400 nm. Antiproliferative investigations conducted with 2-anthrol derivative 7 on three human cancer cell lines showed higher activity for irradiated cells.
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Affiliation(s)
- Đani Škalamera
- Department of Organic Chemistry and Biochemistry, Ruđer Bošković Institute , Bijenička cesta 54, 10 000 Zagreb, Croatia
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11
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12
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Karmakar R, Mal D. Total Synthesis of Chlorocyclinone A, a PPAR-γ Antagonist. J Org Chem 2012; 77:10235-48. [DOI: 10.1021/jo301712b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Raju Karmakar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| | - Dipakranjan Mal
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
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13
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Dunlap T, Piyankarage SC, Wijewickrama GT, Abdul-Hay S, Vanni M, Litosh V, Luo J, Thatcher GRJ. Quinone-induced activation of Keap1/Nrf2 signaling by aspirin prodrugs masquerading as nitric oxide. Chem Res Toxicol 2012; 25:2725-36. [PMID: 23035985 DOI: 10.1021/tx3003609] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The promising therapeutic potential of the NO-donating hybrid aspirin prodrugs (NO-ASA) includes induction of chemopreventive mechanisms and has been reported in almost 100 publications. One example, NCX-4040 (pNO-ASA), is bioactivated by esterase to a quinone methide (QM) electrophile. In cell cultures, pNO-ASA and QM-donating X-ASA prodrugs that cannot release NO rapidly depleted intracellular GSH and caused DNA damage; however, induction of Nrf2 signaling elicited cellular defense mechanisms including upregulation of NAD(P)H:quinone oxidoreductase-1 (NQO1) and glutamate-cysteine ligase (GCL). In HepG2 cells, the "NO-specific" 4,5-diaminofluorescein reporter, DAF-DA, responded to NO-ASA and X-ASA, with QM-induced oxidative stress masquerading as NO. LC-MS/MS analysis demonstrated efficient alkylation of Cys residues of proteins including glutathione-S-transferase-P1 (GST-P1) and Kelch-like ECH-associated protein 1 (Keap1). Evidence was obtained for alkylation of Keap1 Cys residues associated with Nrf2 translocation to the nucleus, nuclear translocation of Nrf2, activation of antioxidant response element (ARE), and upregulation of cytoprotective target genes. At least in cell culture, pNO-ASA acts as a QM donor, bioactivated by cellular esterase activity to release salicylates, NO(3)(-), and an electrophilic QM. Finally, two novel aspirin prodrugs were synthesized, both potent activators of ARE, designed to release only the QM and salicylates on bioactivation. Current interest in electrophilic drugs acting via Nrf2 signaling suggests that QM-donating hybrid drugs can be designed as informative chemical probes in drug discovery.
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Affiliation(s)
- Tareisha Dunlap
- Department of Medicinal Chemistry & Pharmacognosy, University of Illinois College of Pharmacy, 833 South Wood Street, Chicago, Illinois 60612, United States
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14
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Veljković J, Uzelac L, Molčanov K, Mlinarić-Majerski K, Kralj M, Wan P, Basarić N. Sterically congested adamantylnaphthalene quinone methides. J Org Chem 2012; 77:4596-610. [PMID: 22533612 DOI: 10.1021/jo3002479] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Five new (2-adamantyl)naphthol derivatives (5-9, quinone methide precursors, QMP) were synthesized and their photochemical reactivity was investigated by preparative photolyses, fluorescence spectroscopy, and laser flash photolysis (LFP). Excitation of QMP 5 to S(1) leads to efficient excited state intramolecular proton transfer (ESIPT) coupled with dehydration, giving quinone methide QM5 which was characterized by LFP (in CH(3)CN-H(2)O, λ(max) = 370 nm, τ = 0.19 ms). On irradiation of QMP 5 in CH(3)OH-H(2)O (4:1), the quantum yield of methanolysis is Φ = 0.70. Excitation of naphthols QMP 6-8 to S(1) in CH(3)CN leads to photoionization and formation of naphthoxyl radicals. In a protic solvent, QMP 6-8 undergo solvent-assisted PT giving QM6 or zwitterion QM8 that react with nucleophiles delivering adducts, but with a significantly lower quantum efficiency. QMP 9 in a protic solvent undergoes two competitive processes, photosolvolysis via QM9 and solvent-assisted PT to carbon atom of the naphthalene giving zwitterion. QM9 has been characterized by LFP (in CH(3)CN-H(2)O, λ(max) > 600 nm, τ = 0.9 ms). In addition to photogenerated QMs, two stable naphthalene QMs, QM10 and QM11 were synthesized thermally and characterized by X-ray crystallography. QM10 and QM11 do not react with H(2)O but undergo acid-catalyzed fragmentation or rearrangement. Antiproliferative activity of 5-9 was investigated on three human cancer cell lines. Exposure of MCF-7 cells treated with 5 to 300 nm irradiation leads to an enhanced antiproliferative effect, in accordance with the activity being due to the formation of QM5.
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Affiliation(s)
- Jelena Veljković
- Department of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10 000 Zagreb, Croatia
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15
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Dong S, Liu X, Zhang Y, Lin L, Feng X. Asymmetric Synthesis of 3,4-Diaminochroman-2-ones Promoted by Guanidine and Bisguanidium Salt. Org Lett 2011; 13:5060-3. [DOI: 10.1021/ol2018888] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shunxi Dong
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Yulong Zhang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
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16
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Pelto RB, Pratt RF. Serendipitous discovery of α-hydroxyalkyl esters as β-lactamase substrates. Biochemistry 2010; 49:10496-506. [PMID: 21087009 DOI: 10.1021/bi101071r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
O-(1-Carboxy-1-alkyloxycarbonyl) hydroxamates were found to spontaneously decarboxylate in aqueous neutral buffer to form O-(2-hydroxyalkylcarbonyl) hydroxamates. While the former molecules do not react rapidly with serine β-lactamases, the latter are quite good substrates of representative class A and C, but not D, enzymes, and particularly of a class C enzyme. The enzymes catalyze hydrolysis of these compounds to a mixture of the α-hydroxy acid and hydroxamate. Analogous compounds containing aryloxy leaving groups rather that hydroxamates are also substrates. Structure-activity experiments showed that the α-hydroxyl group was required for any substantial substrate activity. Although both d- and l-α-hydroxy acid derivatives were substrates, the former were preferred. The response of the class C activity to pH and to alternative nucleophiles (methanol and d-phenylalanine) suggested that the same active site functional groups participated in catalysis as for classical substrates. Molecular modeling was employed to explore how the α-hydroxy group might interact with the class C β-lactamase active site. Incorporation of the α-hydroxyalkyl moiety into novel inhibitors will be of considerable interest.
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Affiliation(s)
- Ryan B Pelto
- Department of Chemistry, Wesleyan University, Middletown, Connecticut 06459, United States
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17
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Wang H, Wahi MS, Rokita SE. Immortalizing a transient electrophile for DNA cross-linking. Angew Chem Int Ed Engl 2008; 47:1291-3. [PMID: 18175300 DOI: 10.1002/anie.200704137] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Huan Wang
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA
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18
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Wang H, Wahi M, Rokita S. Immortalizing a Transient Electrophile for DNA Cross-Linking. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200704137] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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19
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Majumdar S, Adediran SA, Nukaga M, Pratt RF. Inhibition of class D beta-lactamases by diaroyl phosphates. Biochemistry 2006; 44:16121-9. [PMID: 16331972 DOI: 10.1021/bi051719s] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The production of beta-lactamases is an important component of bacterial resistance to beta-lactam antibiotics. These enzymes catalyze the hydrolytic destruction of beta-lactams. The class D serine beta-lactamases have, in recent years, been expanding in sequence space and substrate spectrum under the challenge of currently dispensed beta-lactams. Further, the beta-lactamase inhibitors now employed in medicine are not generally effective against class D enzymes. In this paper, we show that diaroyl phosphates are very effective inhibitory substrates of these enzymes. Reaction of the OXA-1 beta-lactamase, a typical class D enzyme, with diaroyl phosphates involves acylation of the active site with departure of an aroyl phosphate leaving group. The interaction of the latter with polar active-site residues is most likely responsible for the general reactivity of these molecules with the enzyme. The rate of acylation of the OXA-1 beta-lactamase by diaroyl phosphates is not greatly affected by the electronic effects of substituents, probably because of compensation phenomena, but is greatly enhanced by hydrophobic substituents; the second-order rate constant for acylation of the OXA-1 beta-lactamase by bis(4-phenylbenzoyl) phosphate, for example, is 1.1 x 10(7) s(-)(1) M(-)(1). This acylation reactivity correlates with the hydrophobic nature of the beta-lactam side-chain binding site of class D beta-lactamases. Deacylation of the enzyme is slow, e.g., 1.24 x 10(-)(3) s(-)(1) for the above-mentioned phosphate and directly influenced by the electronic effects of substituents. The effective steady-state inhibition constants, K(i), are nanomolar, e.g., 0.11 nM for the above-mentioned phosphate. The diaroyl phosphates, which have now been shown to be inhibitory substrates of all serine beta-lactamases, represent an intriguing new platform for the design of beta-lactamase inhibitors.
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Affiliation(s)
- Sudipta Majumdar
- Department of Chemistry, Wesleyan University, Middletown, Connecticut 06459, USA
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21
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Adediran SA, Lohier JF, Cabaret D, Wakselman M, Pratt RF. Synthesis and reactivity with beta-lactamases of a monobactam bearing a retro-amide side chain. Bioorg Med Chem Lett 2005; 16:869-71. [PMID: 16300942 DOI: 10.1016/j.bmcl.2005.11.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2005] [Revised: 11/02/2005] [Accepted: 11/03/2005] [Indexed: 11/15/2022]
Abstract
The monobactam sodium 3-benzylcarbamoyl-2-oxo-1-azetidinesulfonate, bearing a retro (vs classical beta-lactam)-amide side chain, has been synthesized and the kinetics of its reaction with typical beta-lactamases studied. The new compound is generally a poorer substrate than the analogous compound with a normal side chain but its formation of a transiently stable complex with a class C beta-lactamase sustains the retro-amide side-chain concept.
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Affiliation(s)
- S A Adediran
- Department of Chemistry, Wesleyan University, Middletown, CT 06459, USA
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22
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Wang H, Wang Y, Han KL, Peng XJ. A DFT Study of Diels−Alder Reactions of o-Quinone Methides and Various Substituted Ethenes: Selectivity and Reaction Mechanism. J Org Chem 2005; 70:4910-7. [PMID: 15960488 DOI: 10.1021/jo0479213] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The Diels-Alder (DA) reactions of various substituted ethenes (methyl vinyl ether (MVE), styrene, and methyl vinyl ketone (MVK)) with o-quinone methides (o-QM) are studied by means of density functional theory (DFT) at the B3LYP/6-31G(d,p) level. On the basis of analysis for frontier molecular orbital and comparison of the activation energies for different reaction pathways, the ortho attack modes present transition structures more stable than the meta ones. The reactivity, ortho selectivity, and asynchronicity are enhanced with the increase of the electron-releasing character of the substitute on ethene fragment. The discussions for the charge distribution and charge transfer on different transition states indicate that there are different molecular mechanisms for the different substituted ethenes. The calculations show that the effect of solvent decreases the activation energy and increases the asynchronicity. The results also indicate that the hydrogen-bond formation between chloroform and the carbonyl oxygen of the o-QM lowers the activation energies and increases the asynchronicity.
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Affiliation(s)
- Hongming Wang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, China
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Adediran SA, Cabaret D, Lohier JF, Wakselman M, Pratt RF. Benzopyranones with retro-amide side chains as (inhibitory) beta-lactamase substrates. Bioorg Med Chem Lett 2005; 14:5117-20. [PMID: 15380211 DOI: 10.1016/j.bmcl.2004.07.067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2004] [Revised: 07/27/2004] [Accepted: 07/28/2004] [Indexed: 10/26/2022]
Abstract
3-(N-Benzylcarbamoyl)-7-carboxy-3, 4-dihydro-2H-1-benzo-pyran-2-one and its 8-carboxy analogue have been synthesized and evaluated as potential (inhibitory) substrates of beta-lactam-recognizing enzymes. These compounds are bicyclic delta-lactones with retro-amide (with respect to classical beta-lactams) side chains. They were found to be comparably effective as substrates of typical class A, C and D beta-lactamases as analogous benzopyranones bearing 'normal' amide side chains. The new 8-carboxy derivative, however, formed a much more (1000-fold) tightly-bound acyl-enzyme with a class C beta-lactamase than did its 'normal' analogue, and thus provides a structural lead to new inhibitors of this class of beta-lactamase.
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Affiliation(s)
- S A Adediran
- Department of Chemistry, Wesleyan University, Middletown, CT 06459, USA
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Freccero M, Gandolfi R, Sarzi-Amadè M. Selectivity of purine alkylation by a quinone methide. Kinetic or thermodynamic control? J Org Chem 2003; 68:6411-23. [PMID: 12895079 DOI: 10.1021/jo0346252] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The alkylation reaction of 9-methyladenine and 9-methylguanine (as prototype substrates of deoxy-adenosine and -guanosine), by the parent o-quinone methide (o-QM), has been investigated in the gas phase and in aqueous solution, using density functional theory at the B3LYP/6-311+G(d,p) level. The effect of the medium on the reactivity, and on the stability of the resulting adducts, has been investigated by using the C-PCM solvation model to assess which adduct arises from the kinetically favorable path, or from an equilibrating process. The calculations indicate that the most nucleophilic site of the methyl-substituted nucleobases in the gas phase is the guanine oxygen atom (O(6)) (DeltaG()(gas) = 5.6 kcal mol(-)(1)), followed by the adenine N1 (DeltaG)(gas) = 10.3 kcal mol(-)(1)), while other centers exhibit a substantially lower nucleophilicity. The bulk effect of water as a solvent is the dramatic reduction of the nucleophilicity of both 9-methyladenine N1 (DeltaG)(solv) = 14.5 kcal mol(-)(1)) and 9-methylguanine O(6) (DeltaG)(solv) = 17.0 kcal mol(-)(1)). As a result there is a reversal of the nucleophilicity order of the purine bases. While O(6) and N7 nucleophilic centers of 9-methylguanine compete almost on the same footing, the reactivity gap between N1 and N7 of 9-methyladenine in solution is highly reduced. Regarding product stability, calculations predict that only two of the adducts of o-QM with 9-methyladenine, those at NH(2) and N1 positions, are lower in energy than reactants, both in the gas phase and in water. However, the adduct at N1 can easily dissociate in water. The adducts arising from the covalent modification of 9-methylguanine are largely more stable than reactants in the gas phase, but their stability is markedly reduced in water. In particular, the oxygen alkylation adduct becomes slightly unstable in water (DeltaG(solv) = +1.4 kcal mol(-)(1)), and the N7 alkylation product remains only moderately more stable than free reactants (DeltaG(solv) = -2.8 kcal mol(-)(1)). Our data show that site alkylations at the adenine N1 and the guanine O(6) and N7 in water are the result of kinetically controlled processes and that the selective modification of the exo-amino groups of guanine N2 and adenine N6 are generated by thermodynamic equilibrations. The ability of o-QM to form several metastable adducts with purine nucleobases (at guanine N7 and O(2), and adenine N1) in water suggests that the above adducts may act as o-QM carriers.
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Affiliation(s)
- Mauro Freccero
- Dipartimento di Chimica Organica, Università di Pavia, Viale Taramelli 10, 27100 Pavia, Italy.
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Cabaret D, Adediran SA, Pratt RF, Wakselman M. New substrates for beta-lactam-recognizing enzymes: aryl malonamates. Biochemistry 2003; 42:6719-25. [PMID: 12779326 DOI: 10.1021/bi0300478] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Aryl malonamates are demonstrated to be novel substrates of a broad range of beta-lactam-recognizing enzymes. These compounds are isomers of the aryl phenaceturates, which are well-known substrates of these enzymes, but the new compounds contain a retro-amide side chain. Several lines of evidence, including comparisons of steady-state kinetic parameters between enzymes and a detailed investigation of the methanolysis kinetics, solvent deuterium isotope effects, and pH-rate profile for turnover of a retro substrate by the Enterobacter cloacae P99 beta-lactamase, suggested that the new substrates are likely to be hydrolyzed by the same chemical mechanisms as "normal" substrates. Molecular modeling indicated that the retro-amide group fits snugly into the active site of the P99 beta-lactamase by hydrogen bonding to the conserved lysine-67 residue. The retro-amide side chain may represent a lead to novel mechanism-based and transition state analogue inhibitors.
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Affiliation(s)
- D Cabaret
- SIRCOB, UMR CNRS 8086, Université de Versailles, Saint Quentin-en-Yvelines, Bâtiment Lavoisier, 45 Avenue des Etats Unis, F-7800, Versailles, France
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Zhang J, Wu X, Cao X, Yang F, Wang J, Zhou X, Zhang XL. Synthesis and antibacterial study of 10, 15, 20-triphenyl-5-(4-hydroxy-3-(trimethylammonium)methyl)phenylporphyrin as models for combination of porphyrin and alkylating agent. Bioorg Med Chem Lett 2003; 13:1097-100. [PMID: 12643920 DOI: 10.1016/s0960-894x(03)00053-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
10, 15, 20-Triphenyl-5-(4-hydroxy-3-(trimethylammonium)methyl)phenylporphyrin 4 and its zinc complex 5 have been synthesized and antibacterial activities have been studied for 4 and its derivative. Compound 4 showed stronger inhibition than that of 10, 15, 20-triphenyl-5-(4-hydroxy-3-(dimethylamine)methyl)phenylporphyrin (2) and 10, 15, 20-triphenyl-5-(4-methoxy-3-(trimethylammonium)methyl)phenylporphyrin (6). It is possible that antibacterial activity of compound 4 involved in photoinducing both o-quinone methide intermediate and singlet oxygen formation.
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Affiliation(s)
- Jianye Zhang
- College of Chemistry and Molecular Sciences, Wuhan University, Hubei Wuhan 430072, PR China
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Abstract
A detailed analysis of the alkylation of phosphodiesters with a p-quinone methide under aqueous conditions has been accomplished. The relative rates of phosphodiester alkylation and hydrolysis have been examined by (1)H NMR analysis of the reaction of 2,6-dimethyl-p-quinone methide in a buffered diethyl phosphate/acetonitrile solution (1:9 v/v, pH 4.0). The rate of hydrolysis of the quinone methide was confirmed by UV analysis in 28.5% solutions of aqueous inorganic phosphate in acetonitrile at pH 4.0 and 7.0. Similarly, the rate of phosphodiester alkylations by the quinone methide was also confirmed by UV analysis in 28.5% solutions of aqueous dibenzyl, dibutyl, or diethyl phosphate in acetonitrile at pH 4.0 and 7.0. These kinetic studies further establish that the phosphodiester alkylation reactions are acid-catalyzed, second-order processes. The rate constant for phosphodiester alkylation was found to range from approximately 370-3700 times the rate constant of quinone methide hydrolysis with diethyl and dibenzyl phosphate, respectively (pH 4.0, 28.5% aqueous acetonitrile).
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Affiliation(s)
- Q Zhou
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, USA
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Di Valentin C, Freccero M, Zanaletti R, Sarzi-Amadè M. o-Quinone methide as alkylating agent of nitrogen, oxygen, and sulfur nucleophiles. The role of H-bonding and solvent effects on the reactivity through a DFT computational study. J Am Chem Soc 2001; 123:8366-77. [PMID: 11516286 DOI: 10.1021/ja010433h] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The reactivity of the alkylating agent o-quinone methide (o-QM) toward NH(3), H(2)O, and H(2)S, prototypes of nitrogen-, oxygen-, and sulfur-centered nucleophiles, has been studied by quantum chemical methods in the frame of DF theory (B3LYP) in reactions modeling its reactivity in water with biological nucleophiles. The computational analysis explores the reaction of NH(3), H(2)O, and H(2)S with o-QM, both free and H-bonded to a discrete water molecule, with the aim to rationalize the specific and general effect of the solvent on o-QM reactivity. Optimizations of stationary points were done at the B3LYP level using several basis sets [6-31G(d), 6-311+G(d,p), adding d and f functions to the S atom, 6-311+G(d,p),S(2df), and AUG-cc-pVTZ]. The activation energies calculated for the addition reactions were found to be reduced by the assistance of a water molecule, which makes easier the proton-transfer process in these alkylation reactions by at least 12.9, 10.5, and 6.0 kcal mol(-1) [at the B3LYP/AUG-cc-pVTZ//B3LYP/6-311+G(d,p) level], for ammonia, water, and hydrogen sulfide, respectively. A proper comparison of an uncatalyzed with a water-catalyzed reaction mechanism has been made on the basis of activation Gibbs free energies. In gas-phase alkylation of ammonia and water by o-QM, reactions assisted by an additional water molecule H-bonded to o-QM (water-catalyzed mechanism) are favored over their uncatalyzed counterparts by 5.6 and 4.0 kcal mol(-1) [at the B3LYP/6-311+G(d,p) level], respectively. In contrast, the hydrogen sulfide alkylation reaction in the gas phase shows a slight preference for a direct alkylation without water assistance, even though the free energy difference (DeltaDeltaG(#)) between the two reaction mechanisms is very small (by 1.0 kcal mol(-1) at the B3LYP/6-311+G(d,p),S(2df) level of theory). The bulk solvent effect, evaluated by the C-PCM model, significantly modifies the relative importance of the uncatalyzed and water-assisted alkylation mechanism by o-QM in comparison to the case in the gas phase. Unexpectedly, the uncatalyzed mechanism becomes highly favored over the catalyzed one in the alkylation reaction of ammonia (by 7.0 kcal mol(-1)) and hydrogen sulfide (by 4.0 kcal mol(-1)). In contrast, activation induced by water complexation still plays an important role in the o-QM hydration reaction in water as solvent.
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Affiliation(s)
- C Di Valentin
- Dipartimento di Chimica Organica, Università di Pavia, V.le Taramelli 10, 27100 Pavia, Italy
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Modica E, Zanaletti R, Freccero M, Mella M. Alkylation of amino acids and glutathione in water by o-quinone methide. Reactivity and selectivity. J Org Chem 2001; 66:41-52. [PMID: 11429928 DOI: 10.1021/jo0006627] [Citation(s) in RCA: 147] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
o-Quinone methide (1) has been produced in water both thermally and photochemically from (2-hydroxybenzyl)trimethylammonium iodide (2). Michael addition reactions of 1 to various amines, and sulfides, including amino acids and glutathione have been carried out, obtaining alkylated adducts (3-16) in fairly good to quantitative yields. The reaction rate and selectivity of 1 toward nitrogen and sulfur nucleophiles, in competition with the hydration reaction, have been investigated at different pH by laser flash photolysis technique. The observed reactivity spans 7 orders of magnitude on passing from water (kNu = 5.8 M-1 s-1) to the most reactive nucleophile (2.8 x 10(8) M-1 s-1, 2-mercaptoethanol under alkaline conditions). These are the first direct reaction rate measurements of nucleophilic addition to the parent o-quinone methide (1). Competition experiments provided strong kinetic support to the involvement of free 1 as an intermediate in both thermal and photochemical reactions. Furthermore, several alkylation adducts regenerate 1 either by heating (9, 10, 13, and 14) or by irradiation (9, 11-13, 16). Such a thermal and photochemical reversibility of the alkylation process opens a new perspective for the use and application of such adducts as o-QM molecular carriers.
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Affiliation(s)
- E Modica
- Dipartimento di Chimica Organica, Università di Pavia, V.le Taramelli 10, 27100 Pavia, Italy
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Cabaret D, Gonzalez M, Wakselman M, Adediran S, Pratt R. Synthesis, Hydrolysis, and Evaluation of 3-Acylamino-3,4-dihydro-2-oxo-2H-1,3-benzoxazinecarboxylic Acids and Linear Azadepsipeptides as Potential Substrates/Inhibitors of β-Lactam-Recognizing Enzymes. European J Org Chem 2001. [DOI: 10.1002/1099-0690(200101)2001:1<141::aid-ejoc141>3.0.co;2-j] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Dyer RG, Turnbull KD. Hydrolytic Stabilization of Protected p-Hydroxybenzyl Halides Designed as Latent Quinone Methide Precursors. J Org Chem 1999. [DOI: 10.1021/jo991085t] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Robert G. Dyer
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701
| | - Kenneth D. Turnbull
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701
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