Abstract
Erlenmeyer thioazlactones are reacted with hydrazonoyl chlorides in the presence of Et3N to afford functionalized N-(1H-pyrazol-5-yl)-1,3,4-thiadiazol-2(3H)-imines in excellent yields. This strategy is based on a domino double 1,3-dipolar cycloaddition reaction of nitrile imines to Erlenmeyer thioazlactones, followed by the elimination of carbon monoxide and phenylmethanthiol from the initially formed cycloadducts. This method provides fast access to a variety of structurally diverse N-(1H-pyrazol-5-yl)-1,3,4-thiadiazol-2(3H)-imines. The structure of a typical product was established by X-ray crystallography.
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We thank the Research Council of Tarbiat Modares University for supporting this work.
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Yavari, I., Taheri, Z., Sheikhi, S. et al. A synthesis of N-(1H-pyrazol-5-yl)-1,3,4-thiadiazol-2(3H)-imines from nitrile imines and Erlenmeyer thioazlactones. Mol Divers 24, 727–735 (2020). https://doi.org/10.1007/s11030-019-09981-0
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DOI: https://doi.org/10.1007/s11030-019-09981-0