Search

The regioselective selenocyanation of imidazoheterocycles using triselenodicyanide at room temperature is reported. The electrophilic aromatic substitution of a broad range of substrates is promoted by the triselenodicyanide obtained by oxidative coupling of malononitrile and selenium dioxide, under an air atmosphere. The major advantages of the presented method are an easy set-up, excellent yields, short reaction times, use of odorless and inexpensive reagents and easy purification of the final products. [ABSTRACT FROM AUTHOR]

Abstract: Two new syntheses of benzyl C-glycosides have been developed. The first one involves an unprecedented oxa-Michael cyclisation and the second one relies on an efficient gold-catalysed ring-closure. [Copyright &y& Elsevier]

Abstract: Ring-closing metathesis of bis-O,O-alkenyl ascorbic acid derivatives affords cyclic ethers in good yields which can be further converted by irradiation at 254nm into new polyoxacyclic structures according to a diastereoselective transannular [2+2] photocycloaddition. [Copyright &y& Elsevier]

We report here the first example of a one-pot synthesis of 2-(alkyl)arylbenzoselenazoles from N -(acetyl)benzoyl-2-iodoanilines. The reaction was carried out in the presence of Woollins’ reagent under microwave irradiation and resulted in moderate to good yields. [ABSTRACT FROM AUTHOR]