scholarly journals (S)-Ethyl 2-(tert-butoxycarbonylamino)-3-(2-iodo-4,5-methylenedioxyphenyl)propanoate

Molbank ◽  
10.3390/m1049 ◽  
2019 ◽  
Vol 2019 (1) ◽  
pp. M1049
Author(s):  
Giovanni Lentini ◽  
Maria Cavalluzzi ◽  
Leonardo Degennaro ◽  
Giuseppe Fracchiolla ◽  
Filippo Perna ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
13C Nmr ◽  
Title Compound ◽  
Target Compound ◽  
Esi Ms

A multistep gram-scale synthesis of (S)-ethyl 2-(tert-butoxycarbonylamino)-3-(2-iodo-4,5-methylenedioxyphenyl)propanoate (2) has been developed. The title compound was prepared starting from commercially available l-DOPA which was O- and N-protected before undergoing iodination by CF3CO2Ag/I2. The structure of the target compound was confirmed using IR, 1H-NMR, 13C-NMR, 2D (COSY, HSQC) NMR spectroscopy, as well as ESI-MS and HRMS.

scholarly journals 6-[1-Acetyl-5-(4-methoxyphenyl)-4,5-dihydro-1H-pyrazole-3-yl]-2(3H)-benzoxazolone

Molbank ◽  
10.3390/m1021 ◽  
2018 ◽  
Vol 2018 (4) ◽  
pp. M1021
Author(s):  
Yordanka Ivanova ◽  
Antonya Todorova ◽  
Christo Chanev ◽  
Ognyan Petrov
Keyword(s):  
Acetic Acid ◽  
Hydrazine Hydrate ◽  
1H Nmr ◽  
Elemental Analysis ◽  
13C Nmr ◽  
Title Compound ◽  
Target Compound

The title compound, 6-[1-acetyl-5-(4-methoxyphenyl)-4,5-dihydro-1H-pyrazol-3-yl]-2(3H)-benzoxazolone, was synthesized by condensation of 6-[3-(4-methoxyphenyl)-2-propenoyl]-2(3H)-benzoxazolone (1) and hydrazine hydrate in acetic acid in 84% yield. The structure of the target compound was confirmed using 1H-NMR, 13C-NMR, IR, MS, and elemental analysis.

scholarly journals Secondary metabolites of three endemic Centaurea L. species

2014 ◽  
Vol 79 (11) ◽  
pp. 1355-1362 ◽  
Author(s):  
Vele Tesevic ◽  
Ivana Aljancic ◽  
Slobodan Milosavljevic ◽  
Vlatka Vajs ◽  
Iris Djordjevic ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Nmr Spectroscopy ◽  
Secondary Metabolites ◽  
Sesquiterpene Lactone ◽  
1H Nmr ◽  
13C Nmr ◽  
1H Nmr Spectroscopy ◽  
13C Nmr Spectroscopy ◽  
Esi Ms ◽  
Aerial Parts

The aerial parts of three endemic Centaurea L. species, namely C. tomorosii Micevski, C. soskae Hayek and C. galicicae Micevski, afforded sesquiterpene lactone cnicin (1) and seven flavonoids: apigenin (2), isokaempferide (3), hispidulin (4), eupatorin (5), cirsimaritin (6), santaflavone (7) and salvigenin (8). The structures of the isolated compounds were determined by UV, 1H NMR and 13C NMR spectroscopy and HR-ESI-MS spectrometry. 1H NMR spectroscopy was used as a method for quantitative analysis of sesquiterpene lactone cnicin.

scholarly journals 1-Tosyl-6-vinyl-4,5,6,7-tetrahydro-1H-benzo [d] imidazole-2-amine

Molbank ◽  
10.3390/m1262 ◽  
2021 ◽  
Vol 2021 (3) ◽  
pp. M1262
Author(s):  
Fiach B. Meany ◽  
Sarah O’Rourke ◽  
Paul V. Murphy
Keyword(s):  
Natural Products ◽  
Nmr Spectroscopy ◽  
1H Nmr ◽  
13C Nmr ◽  
Title Compound ◽  
Ring Opening ◽  
13C Nmr Spectroscopy ◽  
Amino Alcohols ◽  
Epoxide Ring ◽  
Epoxide Ring Opening

The alkene functionalised 2-aminobenzimidazole ring found in terrazoanthine natural products was synthesized in 3 steps from 1,2-epoxy-4-vinylcyclohexane via epoxide ring opening with toluenesulphonamide yielding 2 regioisomeric, separable amino alcohols. One isomer was oxidized to the corresponding ketone and subsequently condensed with cyanamide to furnish the title compound, which was characterized by 1H-NMR and 13C-NMR spectroscopy.

scholarly journals N-(9,10-Dioxo-9,10-dihydroanthracen-1-yl)-2-methylbenzamide

Molbank ◽  
10.3390/m1175 ◽  
2020 ◽  
Vol 2020 (4) ◽  
pp. M1175
Author(s):  
Hamad H. Al Mamari ◽  
Ahmed Al Sheidi
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
Title Compound ◽  
Short Note ◽  
Spectroscopic Methods ◽  
Target Compound ◽  
Bond Functionalization ◽  
Directing Group ◽  
Metal Catalyzed

In the present Short Note, we report a synthesis for the title compound, N-(9,10-dioxo-9,10-dihydroanthracen-1-yl)-2-methylbenzamide by reacting 2-methylbenzoyl chloride (or 2-methylbenzoic acid) with 1-aminoanthraquinone. The synthesized target compound was fully characterized by various spectroscopic methods (1H-NMR, 13C-NMR, IR, GC-MS). The importance of this compound lies its possession of an N,O-bidentate directing group, potentially suitable for metal-catalyzed C-H bond functionalization reactions.

scholarly journals N-Benzo[c][1,2,5]thiazol-4-yl-3-trifluoromethylbenzamide

Molbank ◽  
10.3390/m1075 ◽  
2019 ◽  
Vol 2019 (3) ◽  
pp. M1075 ◽  
Author(s):  
Hamad H. Al Mamari ◽  
Nasser Al Awaimri ◽  
Yousuf Al Lawati
Keyword(s):  
1H Nmr ◽  
Elemental Analysis ◽  
13C Nmr ◽  
Title Compound ◽  
Structural Motif ◽  
Spectroscopic Methods ◽  
Bond Functionalization ◽  
Directing Group ◽  
Metal Catalyzed

The title compound, N-benzo[c][1,2,5]thiazol-4-yl-3-trifluoromethylbenzamide (1) was synthesized by reacting 3-trifluoromethylbenzoyl chloride (4) and 4-aminobenzo[c][1,2,5]thiadiazole (5). The compound was characterized by various spectroscopic methods (1H NMR, 13C NMR, IR, GC-MS) and its composition confirmed by elemental analysis. The importance of this compound lies in its possession of an N,N-bidentate directing group. Such a structural motif is potentially suitable for metal-catalyzed C-H bond functionalization reactions.

New Heterocyclic Compounds from 1,2,4-triazoles Class with Potential Cytotoxic Activity

2017 ◽  
Vol 68 (11) ◽  
pp. 2503-2508 ◽  
Author(s):  
Laura Ileana Socea ◽  
Stefania Felicia Barbuceanu ◽  
Bogdan Socea ◽  
Constantin Draghici ◽  
Theodora Venera Apostol ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Cytotoxic Activity ◽  
Spectral Data ◽  
1H Nmr ◽  
Elemental Analysis ◽  
13C Nmr ◽  
Heterocyclic Compounds ◽  
Cytotoxic Effect ◽  
13C Nmr Spectroscopy ◽  
New Compounds

Acylhydrazinecarbothioamides (2a,b) were synthesized by addition of 2-(5H-dibenzo[a,d][7]annulen-5-yl)acetohydrazide to different isothiocyanates. The new 1,2,4-triazol-3-thioles (3a,b) were synthesized by cyclization of new 2- acylhydrazinecarbothioamides (3a,b) in basic media. Alkylation of 1,2,4-triazole-3-thiols (3a-c) with ethyl bromide gave only S-substituted derivatives (4a-c). The structures of the synthesized compounds have been established on spectral data (IR, 1H-NMR and 13C-NMR spectroscopy) and elemental analysis. The cytotoxic effect of new compounds was evaluated using two alternative models on plant and invertebrate organisms.

ASSIGNMENT OF NMR SIGNALS FOR CHLOROPRENE RUBBER BY TWO-DIMENSIONAL NMR SPECTROSCOPY

2013 ◽  
Vol 86 (2) ◽  
pp. 250-260
Author(s):  
Takayuki Saito ◽  
Seiichi Kawahara ◽  
Yoshito Ohtake
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
13C Nmr ◽  
Quantum Correlation ◽  
Multiple Bond ◽  
Multiple Quantum ◽  
Heteronuclear Multiple Bond Correlation ◽  
Nmr Spectrum ◽  
Chloroprene Rubber ◽  
Nmr Signals

ABSTRACT Various pulse techniques of NMR spectroscopy were applied to CR to assign some small signals in 13C and 1H NMR spectra for the rubber. First, the rubber was subjected to distortionless enhancement by polarization transfer and attached proton test. The small signals in the 13C NMR spectrum were assigned to secondary, tertiary, and quaternary carbons. Second, correlations between 13C and 1H were investigated by heteronuclear multiple quantum correlation, heteronuclear two bond correlation, and heteronuclear multiple bond correlation measurements to assign the small signals in the 13C NMR spectrum in detail. By using the resulting correlations between 13C and 1H, the small unassigned signals in 1H NMR spectrum were assigned to methylene and methine protons of the rubber.

Three-component one-pot reaction for the synthesis of β-amide ketones

2013 ◽  
Vol 67 (5) ◽  
Author(s):  
Yan-Ping Luo ◽  
Qiong Chen
Keyword(s):  
Acetic Acid ◽  
1H Nmr ◽  
Elemental Analysis ◽  
13C Nmr ◽  
Trifluoroacetic Acid ◽  
Title Compound ◽  
Anhydrous Acetonitrile ◽  
One Pot

Abstractβ-amide ketones were synthesised by a three-component one-pot reaction of phenylacetylene, aldehydes, and amides in anhydrous acetonitrile containing trifluoroacetic acid and acetic acid in the presence of AlCl3 catalyst. The title compound structures were identified by 1H NMR, 13C NMR, MS, and elemental analysis.

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