1
|
Grossmann O, Maji R, Aukland MH, Lee S, List B. Katalytische asymmetrische Additionen von Enolsilanen an in situ erzeugte zyklische, aliphatische
N
‐Acyliminiumionen. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202115036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Oleg Grossmann
- Homogene Katalyse Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Deutschland
| | - Rajat Maji
- Homogene Katalyse Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Deutschland
| | - Miles H. Aukland
- Homogene Katalyse Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Deutschland
| | - Sunggi Lee
- Department of Emerging Materials Science Daegu Gyeongbuk Institute of Science and Technology (DGIST) 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun Daegu (Republik Korea
| | - Benjamin List
- Homogene Katalyse Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr (Germany)
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD) Hokkaido University Sapporo 001-0021 Japan
| |
Collapse
|
2
|
List B, Grossmann O, Maji R, Aukland MH, Lee S. Catalytic Asymmetric Additions of Enol Silanes to in situ Generated Cyclic, Aliphatic N-Acyliminium Ions. Angew Chem Int Ed Engl 2021; 61:e202115036. [PMID: 34897932 PMCID: PMC9303265 DOI: 10.1002/anie.202115036] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Indexed: 12/02/2022]
Abstract
Strong and confined imidodiphosphorimidate (IDPi) catalysts enable highly enantioselective substitutions of cyclic, aliphatic hemiaminal ethers with enol silanes. 2‐Substituted pyrrolidines, piperidines, and azepanes are obtained with high enantioselectivities, and the method displays a broad tolerance of various enol silane nucleophiles. Several natural products can be accessed using this methodology. Mechanistic studies support the intermediacy of non‐stabilized, cyclic N‐(exo‐acyl)iminium ions, paired with the confined chiral counteranion. Computational studies suggest transition states that explain the observed enantioselectivity.
Collapse
Affiliation(s)
- Benjamin List
- Max-Planck-Institut für Kohlenforschung, Homogenous Catalysis, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, GERMANY
| | - Oleg Grossmann
- Max-Planck-Institute für Kohlenforschung: Max-Planck-Institut fur Kohlenforschung, Homogenous Catalysis, GERMANY
| | - Rajat Maji
- Max-Planck-Institut für Kohlenforschung: Max-Planck-Institut fur Kohlenforschung, Homogeneous Catalysis, GERMANY
| | - Miles H Aukland
- Max-Planck-Institut für Kohlenforschung: Max-Planck-Institut fur Kohlenforschung, Homogeneou Catalysis, GERMANY
| | - Sunggi Lee
- DGIST: Daegu Gyeongbuk Institute of Science and Technology, Department of Emerging Materials Science, KOREA, REPUBLIC OF
| |
Collapse
|
3
|
Han X, Nie X, Feng Y, Wei B, Si C, Lin G. Intermolecular [4 + 2] process of N-acyliminium ions with simple olefins for construction of functional substituted-1,3-oxazinan-2-ones. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2021.05.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
4
|
Petrović VP, Simijonović D, Milovanović VM, Petrović ZD. Acetophenone Mannich bases: study of ionic liquid catalysed synthesis and antioxidative potential of products. ROYAL SOCIETY OPEN SCIENCE 2018; 5:181232. [PMID: 30564412 PMCID: PMC6281942 DOI: 10.1098/rsos.181232] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 10/09/2018] [Indexed: 05/15/2023]
Abstract
Three-component Mannich reaction of acetophenone or 4-iodoacetophenone with a variety of substituted anilines and benzaldehyde, catalysed with diethanolammonium chloroacetate, was performed under mild conditions. Mannich bases (MBs), of which five are new, were obtained in good to excellent yields. All compounds were characterized using elemental analysis, NMR and IR. In addition, detailed experimental and simulated UV-Vis spectral characterization of these compounds is presented here for the first time. In vitro antioxidative potential of synthetized MBs was evaluated using 2,2-diphenyl-1-picryl-hydrazyl radical and density functional theory (DFT) thermodynamical study. It was shown that compounds with anisidine moiety express moderate antioxidative activity. Mechanism of the organocatalysed Mannich reaction was thoroughly inspected by means of DFT. The reaction undergoes the hydrogen bonding-assisted mechanism. Moreover, the proposed rate determining step of the overall reaction is water elimination in the process of iminium ion formation. To the extent of our knowledge, this is the first detailed report on the influence of this type of catalyst on the formation of iminium ion, as a crucial intermediate for the whole reaction.
Collapse
Affiliation(s)
- Vladimir P. Petrović
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac 34000, Serbia
| | | | | | | |
Collapse
|
5
|
Nachtigall FM, Santos LS. On-bead MALDI-MS monitoring of solid-supported N-acyliminium ion reactions. JOURNAL OF MASS SPECTROMETRY : JMS 2017; 52:254-258. [PMID: 28429450 DOI: 10.1002/jms.3921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Revised: 02/06/2017] [Accepted: 02/06/2017] [Indexed: 06/07/2023]
Affiliation(s)
- F M Nachtigall
- Instituto de Innovacion Basado en Ciencia, Universidad de Talca, P.O. Box 747, Talca, Chile
| | - L S Santos
- Laboratory of Asymmetric Synthesis, Chemistry Institute of Natural Resources, Talca University, P.O. Box 747, Talca, Chile
| |
Collapse
|
6
|
Alvim HG, Bataglion GA, Ramos LM, de Oliveira AL, de Oliveira HC, Eberlin MN, de Macedo JL, da Silva WA, Neto BA. Task-specific ionic liquid incorporating anionic heteropolyacid-catalyzed Hantzsch and Mannich multicomponent reactions. Ionic liquid effect probed by ESI-MS(/MS). Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.10.033] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
7
|
Huang HM, Gao JR, Ye Q, Yu WB, Sheng WJ, Li YJ. Molecular iodine induced/1,3-dipolar cycloaddition/oxidative aromatization sequence: an efficient strategy to construct 2-substituted benzo[f]isoindole-1,3-dicarboxylates. RSC Adv 2014. [DOI: 10.1039/c4ra01593b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A useful method for a molecular iodine induced 1,3-dipolar cycloaddition/oxidative aromatization sequence to construct 2-substituted-benzo[f]isoindole-1,3-dicarboxylates is reported.
Collapse
Affiliation(s)
- Huan-Ming Huang
- Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou, P. R. China
| | - Jian-Rong Gao
- Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou, P. R. China
| | - Qing Ye
- Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou, P. R. China
| | - Wu-Bin Yu
- Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou, P. R. China
| | - Wei-Jian Sheng
- Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou, P. R. China
| | - Yu-Jin Li
- Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou, P. R. China
| |
Collapse
|
8
|
Basher MM, Corilo YE, Sparrapan R, Benassi M, Augusti R, Eberlin MN, Riveros JM. Exploring the intrinsic polar [4+2(+)] cycloaddition reactivity of gaseous carbosulfonium and carboxonium ions. JOURNAL OF MASS SPECTROMETRY : JMS 2012; 47:1526-1535. [PMID: 23147832 DOI: 10.1002/jms.3109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Gas-phase reactions of model carbosulfonium ions (CH(3)-S(+)=CH(2;) CH(3)CH(2)-S(+)=CH(2) and Ph-S(+)=CH(2)) and an O-analogue carboxonium ion (CH(3)-O(+)=CH(2)) with acyclic (isoprene, 1,3-butadiene, methyl vinyl ketone) and cyclic (1,3-cyclohexadiene, thiophene, furan) conjugated dienes were systematically investigated by pentaquadrupole mass spectrometry. As corroborated by B3LYP/6-311 G(d,p) calculations, the carbosulfonium ions first react at large extents with the dienes forming adducts via simple addition. The nascent adducts, depending on their stability and internal energy, react further via two competitive channels: (1) in reactions with acyclic dienes via cyclization that yields formally [4+2(+)] cycloadducts, or (2) in reactions with the cyclic dienes via dissociation by HSR loss that yields methylenation (net CH(+) transfer) products. In great contrast to its S-analogues, CH(3)-O(+)=CH(2) (as well as C(2)H(5)-O(+)=CH(2) and Ph-O(+)=CH(2) in reactions with isoprene) forms little or no adduct and proton transfer is the dominant reaction channel. Isomerization to more acidic protonated aldehydes in the course of reaction seems to be the most plausible cause of the contrasting reactivity of carboxonium ions. The CH(2)=CH-O(+)=CH(2) ion forms an abundant [4+2(+)] cycloadduct with isoprene, but similar to the behavior of such α,β-unsaturated carboxonium ions in solution, seems to occur across the C=C bond.
Collapse
Affiliation(s)
- Muftah M Basher
- ThoMSon Mass Spectrometry Laboratory, Institute of Chemistry, University of Campinas, Campinas, SP, Brazil
| | | | | | | | | | | | | |
Collapse
|
9
|
He X, Zhang S, Guo Y, Wang H, Lin G. Mechanistic Investigations of a Palladium-Diene Catalyzed Suzuki–Miyaura Cross-Coupling Reaction. Organometallics 2012. [DOI: 10.1021/om300115x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Xiaoshuang He
- Shanghai Institute of Organic Chemistry, Chinese Academy
of Sciences, 345 Lingling Road, Shanghai 200032,
People's Republic of China
| | - Shusheng Zhang
- Shanghai Institute of Organic Chemistry, Chinese Academy
of Sciences, 345 Lingling Road, Shanghai 200032,
People's Republic of China
| | - Yinlong Guo
- Shanghai Institute of Organic Chemistry, Chinese Academy
of Sciences, 345 Lingling Road, Shanghai 200032,
People's Republic of China
| | - Haoyang Wang
- Shanghai Institute of Organic Chemistry, Chinese Academy
of Sciences, 345 Lingling Road, Shanghai 200032,
People's Republic of China
| | - Guoqiang Lin
- Shanghai Institute of Organic Chemistry, Chinese Academy
of Sciences, 345 Lingling Road, Shanghai 200032,
People's Republic of China
| |
Collapse
|
10
|
Schrader W, Handayani P, Zhou J, List B. Characterization of Key Intermediates in a Complex Organocatalytic Cascade Reaction Using Mass Spectrometry. Angew Chem Int Ed Engl 2009; 48:1463-6. [DOI: 10.1002/anie.200804353] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wolfgang Schrader
- Max‐Planck‐Institut für Kohlenforschung, Kaiser Wilhelm‐Platz 1, 45470 Mülheim an der Ruhr (Germany)
| | - Peni Purwa Handayani
- Max‐Planck‐Institut für Kohlenforschung, Kaiser Wilhelm‐Platz 1, 45470 Mülheim an der Ruhr (Germany)
| | - Jian Zhou
- Max‐Planck‐Institut für Kohlenforschung, Kaiser Wilhelm‐Platz 1, 45470 Mülheim an der Ruhr (Germany)
| | - Benjamin List
- Max‐Planck‐Institut für Kohlenforschung, Kaiser Wilhelm‐Platz 1, 45470 Mülheim an der Ruhr (Germany)
| |
Collapse
|
11
|
Schrader W, Handayani P, Zhou J, List B. Characterization of Key Intermediates in a Complex Organocatalytic Cascade Reaction Using Mass Spectrometry. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200804353] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Wolfgang Schrader
- Max‐Planck‐Institut für Kohlenforschung, Kaiser Wilhelm‐Platz 1, 45470 Mülheim an der Ruhr (Germany)
| | - Peni Purwa Handayani
- Max‐Planck‐Institut für Kohlenforschung, Kaiser Wilhelm‐Platz 1, 45470 Mülheim an der Ruhr (Germany)
| | - Jian Zhou
- Max‐Planck‐Institut für Kohlenforschung, Kaiser Wilhelm‐Platz 1, 45470 Mülheim an der Ruhr (Germany)
| | - Benjamin List
- Max‐Planck‐Institut für Kohlenforschung, Kaiser Wilhelm‐Platz 1, 45470 Mülheim an der Ruhr (Germany)
| |
Collapse
|
12
|
Kuhakarn C, Tangdenpaisal K, Kongsaeree P, Prabpai S, Tuchinda P, Pohmakotr M, Reutrakul V. Lanthanide triflate catalyzed generation of N-acyliminium ions from α-amido sulfones: the synthesis of (1-alkyl-1-aryl)methyl phenyl sulfones. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.02.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
13
|
A practical method for the synthesis of pyrrolizidine, indolizidine and pyrroloazepinolizidine nucleus. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.01.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
14
|
Meurer EC, Sparrapan R, Tomazela DM, Eberlin MN, Augusti R. Cyclization reactions of acylium and thioacylium ions with isocyanates and isothiocyanates: gas phase synthesis of 3,4-dihydro-2,4-dioxo-2H-1,3,5-oxadiazinium ions. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2005; 16:1602-7. [PMID: 16087345 DOI: 10.1016/j.jasms.2005.05.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2005] [Revised: 05/30/2005] [Accepted: 05/30/2005] [Indexed: 05/03/2023]
Abstract
Gas-phase reactions of several acylium and thioacylium ions, that is H2C=N-C+=O, H2C=N-C+=S, O=C=N-C+=O, S=C=N-C+=O, H3C-C+=O, and (CH3)2N-C+=O, with both a model isocyanate and isothiocyanate, that is, C2H5-N=C=O and C2H5-N=C=S, were investigated using tandem-in-space pentaquadrupole mass spectrometry. In these reactions, the formation of mono- and double-addition products is observed concurrently with proton transfer products. The double-addition products are far more favored in reactions with ethyl isocyanate, whereas the reactions with ethyl isothiocyanate form, preferentially, either the mono-addition product or proton transfer products, or both. Retro-addition dominates the low-energy collision-induced dissociation of the mono- and double-addition products with reformation of the corresponding reactant ions. Ab initio calculations at Becke3LYP//6-311 + G(d,p) level indicate that cyclization is favored for the double-addition products and that products equivalent to those synthesized in solution, that is, of 3,4-dihydro-2,4-dioxo-2H-1,3,5-oxadiazinium ions and sulfur analogs, are formed.
Collapse
Affiliation(s)
- Eduardo C Meurer
- Institute of Chemistry, State University of Campinas, UNICAMP, Campinas, Brazil
| | | | | | | | | |
Collapse
|
15
|
Nazare P, Massaroti P, Duarte LF, Campos DR, Marchioretto MAM, Bernasconi G, Calafatti S, Barros FAP, Meurer EC, Pedrazzoli J, Moraes LAB. Validated method for determination of bromopride in human plasma by liquid chromatography--electrospray tandem mass spectrometry: application to the bioequivalence study. JOURNAL OF MASS SPECTROMETRY : JMS 2005; 40:1197-202. [PMID: 16127659 DOI: 10.1002/jms.898] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A simple, sensitive and specific liquid chromatography-tandem mass spectrometry method for the quantification of bromopride I in human plasma is presented. Sample preparation consisted of the addition of procainamide II as the internal standard, liquid-liquid extraction in alkaline conditions using hexane-ethyl acetate (1 : 1, v/v) as the extracting solvent, followed by centrifugation, evaporation of the solvent and sample reconstitution in acetonitrile. Both I and II (internal standard, IS) were analyzed using a C18 column and the mobile-phase acetonitrile-water (formic acid 0.1%). The eluted compounds were monitored using electrospray tandem mass spectrometry. The analyses were carried out by multiple reaction monitoring (MRM) using the parent-to-daughter combinations of m/z 344.20 > 271.00 and m/z 236.30 > 163.10. The areas of peaks from analyte and IS were used for quantification of I. The achieved limit of quantification was 1.0 ng/ml and the assay exhibited a linear dynamic range of 1-100.0 ng/ml and gave a correlation coefficient (r) of 0.995 or better. Validation results on linearity, specificity, accuracy, precision and stability, as well as application to the analysis of samples taken up to 24 h after oral administration of 10 mg of I in healthy volunteers demonstrated the applicability to bioequivalence studies.
Collapse
Affiliation(s)
- P Nazare
- Clinical Pharmacology and Gastroenterology Unit, São Francisco University Medical School, Av. Sao Francisco de Assis 218, 12916-900 Bragança Paulista, SP, Brazil
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Suga S, Tsutsui Y, Nagaki A, Yoshida JI. Cycloaddition of “N-Acyliminium Ion Pools” with Carbon–Carbon Multiple Bonds. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2005. [DOI: 10.1246/bcsj.78.1206] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
17
|
Domingos JB, Longhinotti E, Brandão TAS, Santos LS, Eberlin MN, Bunton CA, Nome F. Reaction of Bis(2,4-dinitrophenyl) Phosphate with Hydrazine and Hydrogen Peroxide. Comparison of O- and N- Phosphorylation. J Org Chem 2004; 69:7898-905. [PMID: 15527267 DOI: 10.1021/jo048737k] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nonionic hydrazine reacts with anionic bis(2,4-dinitrophenyl) phosphate (BDNPP), giving 2,4-dinitrophenyl hydrazine and dianionic 2,4-dinitrophenyl phosphate by an S(N)2(Ar) reaction, and at the phosphoryl center, giving 2,4-dinitrophenoxide ion and a transient phosphorylated hydrazine that rearranges intramolecularly to N-(2,4-dinitrophenyl)-N-phosphonohydrazine. Approximately 58% of the reaction at pD = 10 occurs by N-phosphorylation, as shown by (31)P NMR spectroscopy. Reaction of HO(2)(-) is wholly at phosphorus, and the intermediate peroxophosphate reacts intramolecularly, displacing a second 2,4-dinitrophenoxide ion, or with H(2)O(2), giving 2,4-dinitrophenyl phosphate and O(2). Rate constants of O- and N-phosphorylation in reactions at phosphorus of NH(2)NH(2), HO(2)(-), and NH(2)OH and its methyl derivatives follow Bronsted relationships with similar slopes, but plots differ for oxygen and nitrogen nucleophiles. The reaction with NH(2)NH(2) has been probed by using both NMR spectroscopy and electrospray ionization mass and tandem mass spectrometry, with the novel interception of key reaction intermediates in the course of reaction.
Collapse
Affiliation(s)
- Josiel B Domingos
- Chemistry Department, Federal University of Santa Catarina, Florianópolis, SC, 88040-900, Brazil
| | | | | | | | | | | | | |
Collapse
|
18
|
Domingos JB, Longhinotti E, Brandão TAS, Bunton CA, Santos LS, Eberlin MN, Nome F. Mechanisms of Nucleophilic Substitution Reactions of Methylated Hydroxylamines with Bis(2,4-dinitrophenyl)phosphate. Mass Spectrometric Identification of Key Intermediates. J Org Chem 2004; 69:6024-33. [PMID: 15373487 DOI: 10.1021/jo0494735] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mono- and dimethylation of hydroxylamine on nitrogen does not significantly affect rates of initial attack of NHMeOH and NMe(2)OH on bis(2,4-dinitrophenyl)phosphate (BDNPP), which is largely by oxygen phosphorylation. O-Methylation, however, blocks this reaction and NH(2)OMe then slowly reacts with BDNPP via N-attack at phosphorus and at the aryl group. With NHMeOH, the initial product of O-attack at phosphorus reacts further, either by reaction with a second NHMeOH or by a spontaneous shift of NHMe to the aryl group via a transient cyclic intermediate. There is a minor N-attack of NHMeOH on BDNPP in an S(N)2(Ar) reaction. Reactions occurring via N-attack are blocked by N-dimethylation, and reaction of NMe(2)OH with BDNPP occurs via O-attack, generating a long-lived product. Reaction mechanisms have been probed, and intermediates identified, by using both NMR and MS spectroscopy, with the novel interception of key reaction intermediates in the course of reaction by electrospray ionization mass and tandem mass spectrometry.
Collapse
Affiliation(s)
- Josiel B Domingos
- Chemistry Department, Federal University of Santa Catarina, Florianópolis, SC, 88040-900, Brazil
| | | | | | | | | | | | | |
Collapse
|
19
|
Camilo NS, Pilli RA. Addition of carbon nucleophiles to cyclic N-acyliminium ions in SDS/water. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.02.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
20
|
Meurer EC, Sparrapan R, Eberlin MN. Gas-phase polar [4+ + 2] cycloaddition with ethyl vinyl ether: a structurally diagnostic ion-molecule reaction for 2-azabutadienyl cations. JOURNAL OF MASS SPECTROMETRY : JMS 2003; 38:1075-1080. [PMID: 14595857 DOI: 10.1002/jms.523] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The intrinsic reactivity of eight gaseous, mass-selected 2-azabutadienyl cations toward polar [4(+) + 2] cycloaddition with ethyl vinyl ether has been investigated by pentaquadrupole mass spectrometric experiments. Cycloaddition occurs readily for all the ions and, with the only exception of those from the N-acyl 2-azabutadienyl cations (N-acyliminium ions), the cycloadducts are found to dissociate readily upon collision activation (CID) both by retro-Diels-Alder reaction and by a characteristic loss of an ethanol (46u) neutral molecule. Ethanol loss from the intact polar [4(+) + 2] cycloadduct functions therefore as a structurally diagnostic test: 72 u neutral gain followed by 46 u neutral loss, i.e., as a combined ion-molecule reaction plus CID 'signature' for N-H, N-alkyl and N-aryl 2-azabutadienyl cations. The two N-acyliminium ions tested are exceptional as they form intact cycloadducts with ethyl vinyl ether which dissociate exclusively by the retro-Diels-Alder pathway.
Collapse
Affiliation(s)
- Eduardo C Meurer
- Institute of Chemistry, State University of Campinas-UNICAMP, 13083-970 Campinas, SP Brazil
| | | | | |
Collapse
|
21
|
Mecozzi T, Petrini M, Profeta R. Reactivity of chiral exocyclic N-acyliminium ions with aromatic derivatives. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0957-4166(03)00123-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
22
|
Suga S, Nagaki A, Tsutsui Y, Yoshida JI. "N-acyliminium ion pool" as a heterodiene in [4 + 2] cycloaddition reaction. Org Lett 2003; 5:945-7. [PMID: 12633112 DOI: 10.1021/ol0341243] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] An N-acyliminium ion pool was found to undergo cycloaddition reaction with a variety of dienophiles such as alkenes and alkynes. A concerted mechanism seems to be most likely for alkyl-substituted alkenes as suggested by the DFT calculations, whereas a stepwise mechanism plays the major role for aryl-substituted alkenes. It is also noteworthy that the present study demonstrates the potential of the combination of the cation pool method and the micromixing in both mechanistic and synthetic aspects.
Collapse
Affiliation(s)
- Seiji Suga
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan.
| | | | | | | |
Collapse
|
23
|
|