The Synthesis of the Thiazolyl-Pyrazoline Derivatives with 1,2,3-Triazole Moiety

CHEN Fei， LIU Fang-ming， CHEN Sen-lin， DONG Zhi-qiang

(College of Materials and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China)

The Synthesis of the Thiazolyl-Pyrazoline Derivatives with 1,2,3-Triazole Moiety

CHEN Fei， LIU Fang-ming， CHEN Sen-lin， DONG Zhi-qiang

(College of Materials and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China)

Novel pyrazoline derivatives with 1,2,3-triazole and thiazole moiety were synthesized by the cyclization of 3,5-diphenyl-1-thiocarbamoylpytazolines(1), and 2-bromo-1-(2-phenyl-1,2,3-triazol-4-yl) ethanone (2) in ethanol. The structure of these compounds was confirmed with IR,1H NMR, mass spectral and elemental analysis.

1,2,3-triazoles; pyrazoline; thiazole

0 Introduction

In recent years, interest in the nitrogen- and sulfur-containing heterocyclic compounds significatively increased mainly due to their versatile agricultural and biological activities. Pyrazoline derivatives have been proven to show a broad spectrum of biological activities including fungicidal, insecticidal, antiproliferative and Cannabinoid receptor antagonists[1-4]. In addition, the 1,2,3-triazole motif makes up the core structure of some compounds with pharmaceutical activities such as anti-influenza, antibacterial, treating cryptosporidiosis and Gaucher disease[5-8]. Furthermore, the thiazole moiety is present in a number of drugs as a pharmacophore, and there are numerous examples of biological activities in the literature including antimicrobial, insecticidal, antibacterial and antiviral activity[9-12].

In our previous papers[13-14], we reported a series of novel pyrazoline derivatives with both thiazole and 1,2,3-triazole in the molecule with a view to obtain higher bioactivity leading compounds. In this publication, we tried to replace the 1-aryl-2-bromoethanones with 2-bromo-1-(2-phenyl-1,2,3-triazol-4-yl) ethanone and synthesized some new thiazolyl-pyrazoline derivatives bearing 1,2,3-triazole moiety, 2-(3,5-diaryl-4,5-dihydro-1H-pyrazol-1-yl)-4-[2H-(2-phenyl-1,2,3-triazol)-4-yl] thiazoles . The synthetic route is shown in Scheme 1.

Scheme 1 The synthesis route of title compounds

1 Experimental

1.1 Materials and synthesis

All the solvents and materials were of reagent grade and purified as required. Reactions were monitored by TLC. Melting points were determined by use of a Mettler FP-5 melting point apparatus and are uncorrected. IR spectra were recorded as KBr pellets on a Bruker Equinox 55 FT-IR spectrophotometer.1H NMR spectra were recorded on a Bruker 400 MHz spectrometer using TMS as internal reference and CDCl3as solvent. Mass spectra were acquired with an Agilent 5975 Instrument (EI, 70 eV).

1.2 The synthesis of 3,5-diphenyl-1-thiocarbamoylpyrazoline (1)

Corresponding chalcone[15](7 mmol) and thiosemicarbazide (0.764 g, 8.4 mmol) was refluxed in ethanol (40 mL). After dissolution of the reactants, a solution of KOH (12.5 mmol) in water (5 mL) was added dropwise. The solution was refluxed for a further 4 h. The reaction mixture was allowed to cool, poured into crushed ice, and the solid mass separated out was filtered, washed with cold ethanol, dried, and crystallized from ethanol/water.

1.3 The synthesis of 2-(3,5-diaryl-4,5-dihydro-1H-pyrazol-1-yl)-4-[2H-(2-phenyl-1,2,3-triazol)-4-yl] thiazoles (3a-3l)

A mixture of 2-bromo-1-(2-phenyl-1,2,3-triazol-4-yl) ethanones 2 (1 mmol) and equivalent amounts of 3,5-diphenyl-1-thiocarbamoylpyrazoline1was refluxed in anhydrous ethanol (20 mL). After completion of the reaction (monitored by TLC), the mixture was allowed to cool. Then the solid product was collected. The product was recrystallized from DMF/ethanol.

3a: Yield 82%, m.p. : 191～192 °C. Yellow solid, IR, ν/cm-l: 2808, 2715 (CH2, CH), 1632, 1596, 1495 (C=N, C=C), 760 (C—S—C);1H NMR (CDCl3, 400 MHz)δ: 7.88 (s, 1H, 1,2,3-triazole-H), 8.08～6.98 (m, 15H, Ar-H), 7.15(s, 1H, thiazole-H), 5.71 (dd, 1H, Hx, Jax= 6.4Hz, Jbx= 11.9Hz), 3.93 (dd, 1H, Hb, Jbx= 11.9Hz, Jab= 17.2Hz), 3.33 (dd, 1H, Ha, Jax= 6.4Hz, Jab= 17.2Hz); MS (EI) m/z (%): 448 (M+), 344, 242, 103, 91, 77; Analyses (%), C26H20N6S: C, 69.62; H, 4.49; N, 18.74; S, 7.15; Found: C, 69.64; H, 4.48; N, 18.75; S, 7.15.

3b: Yield 86%, m.p. : 165～166 °C. Yellow solid, IR, ν/cm-l: 2856, 2808, 2713 (CH3, CH2, CH), 1631, 1596, 1496 (C=N, C=C), 756 (C—S—C);1H NMR (CDCl3, 400 MHz)δ: 7.88 (s, 1H, 1,2,3-triazole-H), 8.08～6.88 (m, 14H, Ar-H), 7.16 (s, 1H, thiazole-H), 5.71 (dd, 1H, Hx, Jax= 6.4Hz, Jbx= 11.7Hz), 3.95 (dd, 1H, Hb, Jbx= 11.7Hz, Jab= 17.4Hz), 3.34 (dd, 1H, Ha, Jax= 6.4Hz, Jab= 17.4Hz); MS (EI) m/z (%): 482 (M+), 374, 242, 138, 103, 91, 77; Analyses (%), C26H19ClN6S: C, 64.66; H, 3.97; Cl, 7.34; N, 17.40; S, 6.63; Found: C, 64.65; H, 3.97; Cl, 7.35; N, 17.42; S, 6.62.

3c: Yield 81%, m.p. : 158～159 °C. Yellow solid, IR, ν/cm-l: 2808, 2712 (CH2, CH), 1632, 1596, 1498 (C=N, C=C), 756 (C—S—C);1H NMR (CDCl3, 400 MHz)δ: 7.93 (s, 1H, 1,2,3-triazole-H), 8.09～6.94 (m, 14H, Ar-H), 7.13 (s, 1H, thiazole-H), 5.66 (dd, 1H, Hx, Jax= 6.2Hz, Jbx= 11.9Hz), 3.88 (dd, 1H, Ha, Jax= 6.2Hz, Jab= 17.2Hz), 3.32 (dd, 1H, Hb, Jbx= 11.9Hz, Jab= 17.2Hz), 2.34 (s, 1H, CH3); MS (EI) m/z (%): 462 (M+), 358, 242, 117, 103, 91, 77; Analyses (%), C27H22N6S: C, 70.11; H, 4.79; N, 18.17; S, 6.93; Found: C, 70.10; H, 4.78; N, 18.19; S, 6.93.

3d: Yield 82%, m.p. : 116～117 °C. Yellow solid, IR, ν/cm-l: 2808, 2717 (CH2, CH), 1632, 1596, 1494 (C=N, C=C), 758 (C—S—C);1H NMR (CDCl3, 400 MHz)δ: 7.93 (s, 1H, 1,2,3-triazole-H), 8.09～6.90 (m, 14H, Ar-H), 7.12 (s, 1H, thiazole-H), 5.67 (dd, 1H, Hx, Jax= 6.4Hz, Jbx= 11.8Hz), 3.88 (dd, 1H, Ha, Jax= 6.4Hz, Jab= 17.3Hz), 3.33 (dd, 1H, Hb, Jbx= 11.8Hz, Jab= 17.3Hz), 3.85 (s, 1H, OCH3); MS (EI) m/z (%): 478 (M+), 374, 242, 134, 119, 103, 91, 77; Analyses (%), C27H22N6OS: C, 67.76; H, 4.63; N, 17.56; O, 3.35; S, 6.70; Found: C, 67.78; H, 4.64; N, 17.54; O, 3.33; S, 6.71.

3e: Yield 83%, m.p. : 192～193 °C. Yellow solid, IR, ν/cm-l: 2802, 2713 (CH2, CH), 1631, 1597, 1495 (C=N, C=C), 757 (C—S—C);1H NMR (CDCl3, 400 MHz)δ: 7.97 (s, 1H, 1,2,3-triazole-H), 8.08～7.28 (m, 14H, Ar-H), 7.15(s, 1H, thiazole-H), 5.86 (dd, 1H, Hx, Jax= 5.8Hz, Jbx= 11.6Hz), 3.92 (dd, 1H, Ha, Jax= 5.8Hz, Jab= 17.6Hz), 3.34 (dd, 1H, Hb, Jbx= 11.6Hz, Jab= 17.5Hz); MS (EI) m/z (%): 482 (M+), 344, 242, 137, 103, 91, 77; Analyses (%), C26H19ClN6S: C, 64.66; H, 3.97; Cl, 7.33; N, 17.40; S, 6.64; Found: C, 64.67; H, 3.97; Cl, 7.36; N, 17.39; S, 6.61.

3f: Yield 81%, m.p. : 187～188 °C. Yellow solid, IR, ν/cm-l: 1632, 1596, 1493 (C=N, C=C), 752 (C—S—C);1H NMR (CDCl3, 400 MHz)δ: 7.90 (s, 1H, 1,2,3-triazole-H), 8.06～7.32 (m, 13H, Ar-H), 7.16 (s, 1H, thiazole-H), 5.73 (dd, 1H, Hx, Jax= 6.2Hz, Jbx= 12.0Hz), 3.90 (dd, 1H, Ha, Jax= 6.2Hz, Jab= 17.4Hz), 3.29 (dd, 1H, Hb, Jbx= 12.0Hz, Jab= 17.4Hz); MS (EI) m/z (%): 516 (M+), 378, 242, 138, 103, 91, 77; Analyses (%), C26H18Cl2N6S: C, 60.35; H, 3.51; Cl, 13.70; N, 16.24; S, 6.20; Found: C, 60.36; H, 3.52; Cl, 13.70; N, 16.22; S, 6.20.

3g: Yield 80%, m.p. : 274～275 °C. Yellow solid, IR, ν/cm-l: 1631, 1595, 1493 (C=N, C=C), 751 (C—S—C);1H NMR (CDCl3, 400 MHz)δ: 7.90 (s, 1H, 1,2,3-triazole-H), 8.06～6.92 (m, 13H, Ar-H), 7.15 (s, 1H, thiazole-H), 5.72 (dd, 1H, Hx, Jax= 6.2Hz, Jbx= 12.0Hz), 3.91 (dd, 1H, Ha, Jax= 6.2Hz, Jab= 17.2Hz), 3.32 (dd, 1H, Hb, Jbx= 12.0Hz, Jab= 17.2Hz), 2.33 (s, 1H, CH3); MS (EI) m/z (%): 496 (M+), 358, 242, 117, 91, 77; Analyses (%), C27H21ClN6S: C, 65.25; H, 4.26; Cl, 7.13; N, 16.91; S, 6.45; Found: C, 65.25; H, 4.24; Cl, 7.12; N, 16.93; S, 6.46.

3h: Yield 82%, m.p. : 163～164 °C. Yellow solid, IR, ν/cm-l: 2805, 2716 (CH2, CH), 1632, 1596, 1493 (C=N, C=C), 757 (C—S—C);1H NMR (CDCl3, 400 MHz)δ: 7.90 (s, 1H, 1,2,3-triazole-H), 8.06～6.90 (m, 13H, Ar-H), 7.16 (s, 1H, thiazole-H), 5.71 (dd, 1H, Hx, Jax= 6.2Hz, Jbx= 11.8Hz), 3.91 (dd, 1H, Ha, Jax= 6.2Hz, Jab= 17.3Hz), 3.32 (dd, 1H, Hb, Jbx= 11.8Hz, Jab= 17.3Hz), 3.85 (s, 1H, OCH3); MS (EI) m/z (%): 512 (M+), ; Analyses (%), C27H21ClN6OS: C, 63.21; H, 4.13; Cl, 6.91; N, 16.38; O, 3.12; S, 6.25; Found: C, 63.19; H, 4.14; Cl, 6.92; N, 16.36; O, 3.12; S, 6.27.

3i: Yield 78%, m.p. : 192～193 °C. Yellow solid, IR, ν/cm-l: 2808, 2718 (CH2, CH), 1632, 1592, 1516 (C=N, C=C), 758 (C—S—C);1H NMR (CDCl3, 400 MHz)δ: 7.92 (s, 1H, 1,2,3-triazole-H), 8.02～6.94 (m, 13H, Ar-H), 7.12 (s, 1H, thiazole-H), 5.67 (dd, 1H, Hx, Jax= 6.5Hz, Jbx= 11.8Hz), 3.88 (dd, 1H, Ha, Jax= 6.5Hz, Jab= 17.6Hz), 3.32 (dd, 1H, Hb, Jbx= 11.8Hz, Jab= 17.6Hz), 3.87 (s, 1H, OCH3); MS (EI) m/z (%): 478 (M+), 344, 242, 133, 103, 91, 77; Analyses (%), C27H22N6OS: C, 67.76; H, 4.64; N, 17.56; O, 3.34; S, 6.70; Found: C, 67.75; H, 4.63; N, 17.57; O, 3.33; S, 6.70.

3j: Yield 82%, m.p. : 165～166 °C. Yellow solid, IR, ν/cm-l: 2808, 2713 (CH2, CH), 1631, 1592, 1514 (C=N, C=C), 758 (C—S—C);1H NMR (CDCl3, 400 MHz)δ: 7.92 (s, 1H, 1,2,3-triazole-H), 8.02～6.94 (m, 13H, Ar-H), 7.12 (s, 1H, thiazole-H), 5.65 (dd, 1H, Hx, Jax= 6.2Hz, Jbx= 11.8Hz), 3.91 (dd, 1H, Ha, Jax= 6.2Hz, Jab= 17.2Hz), 3.32 (dd, 1H, Hb, Jbx= 11.8Hz, Jab= 17.2Hz), 3.87 (s, 1H, OCH3); MS (EI) m/z (%): 512 (M+), 374, 242, 134, 119, 103, 91, 77; Analyses (%), C27H21ClN6OS: C, 63.21; H, 4.13; Cl, 6.91; N, 16.38; O, 3.12; S, 6.25; Found: C, 63.22; H, 4.13; Cl, 6.91; N, 16.37; O, 3.10; S, 6.27.

3k: Yield 82%, m.p. : 153～154 °C. Yellow solid, IR, ν/cm-l: 2864, 2806, 2719 (CH3,CH2, CH), 1631, 1592, 1513 (C=N, C=C), 752 (C—S—C);1H NMR (CDCl3, 400 MHz)δ: 7.93 (s, 1H, 1,2,3-triazole-H), 8.09～6.94 (m, 13H, Ar-H), 7.12 (s, 1H, thiazole-H), 5.67 (dd, 1H, Hx, Jax= 6.4Hz, Jbx= 11.8Hz), 3.88 (dd, 1H, Ha, Jax= 6.4Hz, Jab= 17.3Hz), 3.32 (dd, 1H, Hb, Jbx= 11.8Hz, Jab= 17.3Hz), 3.86 (s, 1H, OCH3), 2.32 (s, 1H, CH3); MS (EI) m/z (%): 492 (M+), 358, 242, 133, 117, 91, 77; Analyses (%), C28H24N6OS: C, 68.27; H, 4.91; N, 17.06; O, 3.25; S, 6.51; Found: C, 68.29; H, 4.94; N, 17.03; O, 3.25; S, 6.49.

3l: Yield 82%, m.p. : 181～182 °C. Yellow solid, IR, ν/cm-l: 2807, 2715 (CH2, CH), 1632, 1592, 1514 (C=N, C=C), 757 (C—S—C);1H NMR (CDCl3, 400 MHz)δ: 7.93 (s, 1H, 1,2,3-triazole-H), 8.09～6.87 (m, 13H, Ar-H), 7.13 (s, 1H, thiazole-H), 5.67 (dd, 1H, Hx, Jax= 6.2Hz, Jbx= 12.0Hz), 3.89 (dd, 1H, Ha, Jax= 6.2Hz, Jab= 17.4Hz), 3.33 (dd, 1H, Hb, Jbx= 12.0Hz, Jab= 17.4Hz), 3.86 (s, 1H, OCH3), 3.87 (s, 1H, OCH3); MS (EI) m/z (%): 508 (M+), 374, 242, 133, 103, 91, 77; Analyses (%), C27H22N6OS: C, 66.12; H, 4.76; N, 16.52; O, 6.29; S, 6.31; Found: C, 66.15; H, 4.76; N, 16.51; O, 6.27; S, 6.31.

2 Results and discussion

The starting compounds 1,3-diaryl-2-propenones which were readily obtained by the reaction of aromatic aldehydes and 1-arylethanones via the Claisen-Schmidt condensation reaction in good yield, subsequently reacted with thiosemicarbazide in the presence of sodium hydroxide in ethanol, to give 3,5-diphenyl-1-thiocarbamoylpyrazolines[16](1), then underwent condensation with 2-bromo-1-(2-phenyl-1,2,3-triazol-4-yl)ethanones (2)[17]in refluxing ethanol resulted in the formation of the desired cyclized title products (3a-l) in 78～86%.

The IR spectral, mass spectra, and1H NMR spectral data gave strong evidence for the structures of 3a-l.1H NMR revealed two singlets at 7.97～7.88, and 7.16～7.12 ppm which could be attributed to the pyrazole-H and 1,2,3-triazole-H, respectively. The presence of a multiplet at 8.09～6.87 ppm was ascribed to the aromatic protons. Remarkably, three distinct double of doublets of the ABX system of the pyrazoline ring (Jab= 17.2-17.6, Jax= 5.8-6.5, Jbx= 12.0-11.6 Hz) were observed at δ 5.86-5.65, 3.95-3.88, 3.34-3.29 ppm, respectively. Their infrared spectra contained strong absorption bands for C=N double bonds at 1631-1632 cm-1. The EI mass spectra of compounds 3a-lrevealed the existence of the molecular ion peaks and anticipated fragmentation peaks, which were in good agreement with the given structures of products. For example, the mass spectrum of 3a(Fig. 1) had molecular ion peaks at m/z 448, 344 (M-C8H8), 242 (M-C15H12N1), 103 (M-C18H13N6S), 91 (C7H7), 77 (C6H5), consistent with the molecular formula.

Fig. 1 Proposed fragmentation patterns of 3a

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新型含1,2,3-三唑基的噻唑-吡唑啉衍生物的合成

陳 菲，劉方明，陳森林，董志強

(杭州師范大學材料與化學化工學院，浙江 杭州 310036)

1-氨基硫代甲酰基-3,5-二芳基-4,5-二氫吡唑(1)和1-(2-苯基-1,2,3-三唑-4-基)-2-溴乙酮(2)在乙醇中回流環(huán)化, 制備一系列新型含噻唑基、1,2,3-三唑基的吡唑啉衍生物, 其結(jié)構(gòu)經(jīng)紅外、核磁氫譜、質(zhì)譜和元素分析確認.

1,2,3-三唑;吡唑啉;噻唑

date：2012-03-16

LIU Fang-ming(1966—),male, professor, engaged in synthesis of heterocyclic compound. E-mail: fmilu859@sohu.com

11.3969/j.issn.1674-232X.2012.05.008

O626.25ArticlecharacterA

1674-232X(2012)05-0420-06