Molybdenum (V)-mediated cleavage of C(sp2)-Se bond and C(sp2)-H bond as well as intramolecular oxidative C(sp2)-Se coupling reaction of phenylselenyl-functionalized arenes or heterocycles has been developed. Three kinds of benzoselenophene frameworks...

A new one-pot method for the efficient synthesis of 1-(1-(amino)cyclopropyl)ketone compounds has been developed. Under the mediation of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), 1-(1-(amino)cyclopropyl)ketones were obtained in 70%～93% yields through a reaction sequence of nucleophilic addition/proton migration/nucleophilic substitution and deselenization of β-amino ketones and methyl phenyl vinyl selenium tetrafluoroborate. This method features mild reaction conditions, simple experiment operation, good functional group compatibility. Diphenyl diselenide, the general substrate of the selenium salt reagents, can be prepared by the simple treatment of the by-product methyl phenyl selenide with bromine and hydrazine. Therefore, the vinylselenide salts can be regenerated and reused, which improves the utilization of high-valent selenium reagents and improves the industrial application of this method.