Formations of aryl or pyrrole ring via palladium‐catalyzed CH functionalization on amido‐substituted quinones in the presence of amines or phosphines

Abstract

AbstractA di‐substituted quinone (5), having two amido‐groups at opposite positions, was reacted with tertiary, secondary, or primary amines via a one‐pot reaction in the presence of palladium salt. Crystal structures of some of the products, 7b‐7c, from these reactions reveal that two new pyrrole rings are formed and linked to quinone framework of 5 by taking advantage of the in situ generated alkenyl moiety, which is from the reaction of amine with palladium salt. Furthermore, the reaction of di‐amido substituted diquinone (8a) with tertiary amines led to the formations of 9a‐9d with new pyrrole and benzene rings to the moiety of 8a. Similar procedures for the reaction of 8b with tertiary amines provides an alternated route to make notable 1,4,5,8‐phenanthrenetetraone derivatives, 9e and 9f. Moreover, the reaction of diquinone (8a) with tricyclohexylphosphine led to two products, 11 and 13, with new formation of furan ring as well as PC bond. Further reaction of 11 with NBu3 yielded 14 with newly formed pyrrole ring. Crystal structures of these newly‐formed compounds revealed by single‐crystal X‐ray diffraction methods substantiate the claim.