scholarly journals Synthesis of spiro[benzo[4,5]imidazo[2,1-b][1,3]thiazole-2,3-thiolane]s via sulfa-Michael/aldol cascade reactions

2019 ◽  
Vol 43 (1-2) ◽  
pp. 63-66 ◽  
Author(s):  
Jiaying Lei ◽  
Xinliang Fu ◽  
Yulin Huang ◽  
Xiaofang Li
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
High Resolution ◽  
High Resolution Mass Spectrometry ◽  
Cascade Reactions ◽  
Cascade Reaction ◽  
Crystallographic Analysis ◽  
X Ray ◽  
Resolution Mass

The sulfa-Michael/aldol cascade reaction of ( Z)-2-arylmethylidene-benzo[4,5]imidazo[2,1- b]thiazol-3(2H)-ones and 1,4-dithiane-2,5-diol afforded novel 2-aryl-4-hydroxy-spiro[benzo[4,5]imidazo[2,1- b][1,3]thiazole-2,3-thiolan]-3-ones in moderate yields. The structures of all the products were characterized thoroughly by nuclear magnetic resonance, infrared and high-resolution mass spectrometry together with X-ray crystallographic analysis.

Synthesis of 1,2,3-triazole-substituted 6,7-dihydroindolizin-8(5H)-one derivatives mediated by Selectfluor

2019 ◽  
Vol 43 (5-6) ◽  
pp. 179-183
Author(s):  
Yulin Huang ◽  
Jiaying Lei ◽  
Xinliang Fu ◽  
Wenlin Xie ◽  
Xiaofang Li
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
High Resolution ◽  
High Resolution Mass Spectrometry ◽  
Crystallographic Analysis ◽  
X Ray ◽  
High Resolution Mass ◽  
Moderate Yield ◽  
Resolution Mass

The 1,2,3-triazole and 1 H-1,2,3-benzotriazole-substituted 6,7-dihydroindolizin-8(5 H)-one derivatives were synthesized by the reaction of ( E)-7-(arylmethylidene)-6,7-dihydroindolizin-8(5 H)-ones with 1,2,3-triazole and 1 H-1,2,3-benzotriazole in the presence of Selectfluor in moderate yield. The structures of all the products were characterized thoroughly by nuclear magnetic resonance, infrared, and high-resolution mass spectrometry together with X-ray crystallographic analysis.

Fluorescence staining of salicylaldehyde azine, and applications in the determination of potassium tert-butoxide

RSC Advances ◽  
2016 ◽  
Vol 6 (36) ◽  
pp. 30636-30641 ◽  
Author(s):  
Jinlai Yang ◽  
Jian Rui ◽  
Xu Xu ◽  
Yiqin Yang ◽  
Jun Su ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
High Resolution ◽  
High Resolution Mass Spectrometry ◽  
Fluorescence Staining ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Resolution Mass

Salicylaldehyde azine (1), with an aggregation-induced emission (AIE) function, was synthesized from salicylaldehyde and characterized by nuclear magnetic resonance, high resolution mass spectrometry, and X-ray single crystal diffraction.

scholarly journals Neo-Aplysiatoxin A Isolated from Okinawan Cyanobacterium Moorea Producens

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 457 ◽  
Author(s):  
Mioko Kawaguchi ◽  
Masayuki Satake ◽  
Bo-Tao Zhang ◽  
Yue-Yun Xiao ◽  
Masayuki Fukuoka ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Growth Inhibition ◽  
Spectroscopic Data ◽  
High Resolution Mass Spectrometry ◽  
High Resolution Mass ◽  
Resolution Mass ◽  
Nuclear Magnetic

A new aplysiatoxin derivative, neo-aplysiatoxin A (1), along with seven known compounds, neo-debromoaplysiatoxin A (2), dolastatin 3 (3), lyngbic acid (4), malyngamide M (5), hermitamide A (6), (−)-loliolide (7), and (+)-epiloliolide (8), was isolated from the Okinawan cyanobacterium Moorea producens. Their structures were elucidated on the basis of spectroscopic data, including high-resolution mass spectrometry and nuclear magnetic resonance. The compounds were evaluated for cytotoxic and diatom growth inhibition activities.

scholarly journals 5-(4-Bromophenyl)-7-(2,4-dimethoxyphenyl)-4,7-dihydrotetrazolo[1,5-a]pyrimidine

Molbank ◽  
10.3390/m1037 ◽  
2018 ◽  
Vol 2018 (4) ◽  
pp. M1037
Author(s):  
Kautsar Haq ◽  
Mareta Liawati ◽  
Abdulloh Abdulloh ◽  
Hery Suwito
Keyword(s):  
Molecular Structure ◽  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Magnetic Resonance ◽  
High Resolution ◽  
High Resolution Mass Spectrometry ◽  
Nmr Spectrum ◽  
Cyclocondensation Reaction ◽  
Resolution Mass

A derivative of dihydrotetrazolopyrimidine has been successfully synthesized through a cyclocondensation reaction between a chalcone derivative with 5-aminotetrazole. The molecular structure of the title compound was established based on Fourier transform infrared spectra (FTIR), high-resolution mass spectrometry (HRMS), 1D and 2D nuclear magnetic resonance (NMR) spectrum.

scholarly journals Five New Ent-Atisene Glycosides From Stevia rebaudiana

2019 ◽  
Vol 14 (7) ◽  
pp. 1934578X1986265
Author(s):  
Krishna P. Devkota ◽  
Romila D. Charan ◽  
Christopher Priedemann ◽  
Ryan Donovan ◽  
Tara M. Snyder ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Magnetic Resonance Spectroscopy ◽  
High Resolution Mass Spectrometry ◽  
Stevia Rebaudiana ◽  
Resonance Spectroscopy ◽  
Stevia Rebaudiana Bertoni ◽  
Resolution Mass

Five new ent-atisene diterpene glycosides (1-5) have been isolated from Stevia rebaudiana Bertoni. This adds to a list of only 2 new ent-atisene diterpene glycosides isolated previously from S. rebaudiana. Diterpene glycosides isolated from S. rebaudiana, such as the rebaudiosides, are typically associated with the ent-kaurene core and glycosylation at the C-13 and C-19 positions. Extensive application of nuclear magnetic resonance spectroscopy techniques (1H, 13C, 1D-TOCSY, COSY, HSQC-DEPT, HMBC, and ROESY) as well as high-resolution mass spectrometry demonstrated that the ent-atisenes 1 to 5 had glycosylation patterns identical to rebaudiosides J, N, O, K, and T, respectively. We have named these compounds stevatisene J, N, O, K, and T, respectively.

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