Synthesis of Biaryl Derivatives by Using Ruthenium-Mediated [2+2+2] Cyclotrimerization and Suzuki-Miyaura Cross-Coupling as Key Steps
作者:Sambasivarao Kotha、Vittal Seema、Shaikh Mobin
DOI:10.1055/s-0030-1260009
日期:2011.5
Functionalized biaryl derivatives have been prepared by applying [2+2+2] cyclotrimerization with the aid of Grubbs’ first-generation catalyst (G-I). The trimerized products were subjected to the Suzuki-Miyaura cross-coupling reaction sequence to generate highly functionalized biaryl derivatives.
Rhodium-catalyzed isomerization and alkyne exchange reactions of 1,4-dithiines occurred by cleavage of two C–S bonds. The 2,5- and 2,6-disubstituted 1,4-dithiins underwent isomerization reactions in toluene at 110 °C, providing equilibrium mixtures of isomers. At 150 °C, the reaction of 1,4-dithiins and dimethyl acetylenedicarboxylate gave unsymmetric 2,3-di(methoxycarbonyl)-1,4-dithiins and 2,3-d