No abstract

A simple and efficient protocol for the electrophilic thiocyanation of indoles and aromatic amines with thiourea/NCS/NH 4 SCN system has been developed. The major features of the present procedure are the mild conditions, good yields, short reaction times, and the use of inexpensive and readily available organocatalyst. Moreover, N-chlorosuccinimide (NCS) was found to be indispensable, and thiourea could greatly promote the reaction.

PANI (polyaniline)–g-C3N4–TiO2 composite was prepared and utilized in the photocatalyzed synthesis of α-chloro aryl ketones via a radical-triggered domino process under oxygen atmosphere. This semiconductor photocatalyst showed good photocatalytic performance and chemoselectivity under visible light irradiation. A variety of aryl diazonium salts and aryl alkynes survived the reaction conditions well to afford the corresponding products in moderate to good yields. Scale-up (10 mmol) synthesis was also achieved. The recycle studies showed that the semiconductor composite could be readily recovered and reused for eight consecutive runs with a slight decrease in the catalytic activity. Control experiments were also performed, and a plausible catalytic mode was proposed.

No abstract

No abstract