A surprising double carbon–nitrogen coupling reaction catalyzed by [H 3 Ru 4 (C 6 H 6 ) 4 (OH)] 2+ : synthesis of unusual barbiturate analogues
摘要:
Seven- and eight-membered analogues of barbituric acid are easily accessible by insertion of carbodiimides into cyclic anhydrides catalyzed by the cationic hydroxo cluster [H3Ru4(C6H6)(4)(OH)](2+). (C) 2002 Elsevier Science Ltd. All rights reserved.