Abstract
Highly selective C3-sulfenylation and C3-selenylation of 3-iodo-5-aryl pyrazolo[1,5-a]pyrimidin-7-amine in water was established to provide a green and effective method for the construction of diverse C3-aryl sulfide and C3-aryl selenide derivatives. This regioselective C3-sulfenylation and C3-selenylation protocol proceeds efficiently in the presence of phase transfer catalyst PEG-400 with moderate to good yields. The strategy offers the advantages of green reaction conditions, a wide range of substrates, and gram-scale synthesis.
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