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DOI: 10.1055/s-2005-865209
PEG-Supported Synthesis of 3,5-Disubstituted 1,2,4-Triazoles
Publication History
Publication Date:
14 April 2005 (online)
Abstract
1,3-Dipolar cycloadditions between diethyl azodicarboxylate and the polymer-bound munchnones generated from the corresponding carboxylic acids provided a library of 3,5-disubstituted 1,2,4-triazoles in excellent yield and high purity.
Key words
PEG-bound munchnones - diethyl azodicarboxylate - cycloadditions - 1,2,4-triazoles - parallel synthesis
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References
The polymer-bound 1 was characterized by 200 MHz 1H NMR analysis in CDCl3: δ = 3.08 (3 H, s, CH3SO2), 3.52-3.74 (PEGO-CH2CH2O, m). The polymer-bound 2 was characterized by 200 MHz 1H NMR analysis in CDCl3: δ = 3.66-3.87 (PEG, m), 4.20 (t, 2 H, -PEGOCH2CH 2OC=O), 6.42 (1 H, d), 6.47 (1 H, d,) 7.38 (1 H, d), 8.59 (1 H, s).
7All the compounds were characterized and their structures were confirmed by spectrometric methods (1H NMR, 13C NMR, MS) and elemental analysis. Compound 7f is as follow: 1H NMR (400MHz, CD3OD): δ = 3.84 (3 H, s), 7.03-7.06 (2 H, dt, J = 2.4, 9 Hz), 7.47-7.50 (3 H, m), 7.96-7.99 (2 H, dt, J = 2.4, 9 Hz), 8.04-8.07 (2 H, m); 13C NMR (CD3OD): δ = 56.1, 115.5, 115.6, 127.8, 129.4, 129.4, 130.3, 130.6, 131.2, 131.4, 162.9; MS (EI): m/z = 251 (M+); Anal. Calcd for C15H13N3O: C, 71.70; H, 5.21; N, 16.72. Found: C, 71.52; H, 5.29; N, 16.64.