Direct synthesis of imidazothiones from simple, commercial substrates is not known. We report a method for the condensation of acetophenones, elemental sulfur, and ammonium acetate as a nitrogen source to obtain the hitherto challenging five-membered heterocycles. Functionalities such as halogen, trifluoromethyl, cyano, methylthio, and heteroaryl groups were well tolerated.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9057481 | PMC |
http://dx.doi.org/10.1039/d0ra03047c | DOI Listing |
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