Suzuki reaction Ullmann coupling

Pd(OAc)2 Bu NBr is much more desirable than the Ullmann coupling because it is catalytic and the reaction temperature is much lower. Suzuki couplings can be done in water. 

Coupling reactions. Various (Heck, Stille, Suzuki, Sonogashira, and Ullmann) coupling reactions are mediated by a stable palladacycle 1. ... 

Other couplings. 1-Alkylthio-l,3-butadienes are assembled by a one-pot method involving hydroboration of thioalkynes and Suzuki coupling with alkenyl halides, both reactions catalyzed by Pd(II). Ullmann coupling using a Cu-(PhjPjjPdCh/DMSO system delivers nitrophenylpyridines. ... 

Suzuki-Miyaura, Ullmann, Sonogashira, and Heck Coupling Reactions... 

Occasionally, the Ullmann reaction is the only successful method of coupling two aryl groups when other, more prevalent coupling reactions fail. Broady and coworkers for example, attempted to synthesize the core of colchicine-based natural products (19) initially utilizing a Suzuki reaction to carry out... 

Lloyd-Williams, P., Giralt, E. Atropisomerism, biphenyls and the Suzuki coupling peptide antibiotics. Chem. Soc. Rev. 2001, 30,145-157. Dupont, J., de Souza, R. F., Suarez, P. A. Z. Ionic Liquid (Molten Salt) Phase Organometallic Catalysis. Chem. Rev. 2002, 102, 3667-3691. Hassan, J., Sevignon, M., Gozzi, C., Schulz, E., Lemaire, M. Aryl-Aryl Bond Formation One Century after the Discovery of the Ullmann Reaction. Chem. Rev. 2002, 102, 1359-1469. 

Several new alternatives to the classical methods of synthesis of biheterocycles have been developed. Most notable among these are low-valent transition metal-catalyzed homo-coupling reactions, which are particularly applicable to the synthesis of biheterocycles, and which give much better yields than the earlier Ullmann and Busch procedures. Furthermore, un-symmetrical biheterocycles are now more readily available by way of palladium-catalyzed cross-coupling reactions, such as the Stille and the Suzuki procedures. Thus, many new members of the biheterocyclic series are now available for study. As a consequence of the increased sophistication of molecular structure determination techniques, aromatic biheterocycles have been the subject of many recent spectroscopic and X-ray crystallographic studies, as well as numerous molecular orbital and molecular mechanics calculations. 

Metal-catalyzed coupling reactions (Grignard, Ullmann, Wurtz-Fittig, Yamamoto and Suzuki)... 

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