Efficient synthesis of racemic and chiral alkenyl sulfoxides by palladium-catalyzed Suzuki coupling
作者:Gisela Mancha、Ana B. Cuenca、Nuria Rodríguez、Mercedes Medio-Simón、Gregorio Asensio
DOI:10.1016/j.tet.2010.06.050
日期:2010.8
palladium-catalyzed Suzuki/Miyaura cross-couplingreaction of racemic and chiral 1-halo sulfoxides with aryl and alkenyl boronic acids. Chiral substrates react with no loss of optical purity and high optical yields. The reaction takes place with different palladium catalysts, such as Pd(PPh3)4 or Pd(OAc)2/DABCO. Although nitrogen ligands like DABCO lead to an active palladium catalyst, they are less effective
Synthesis and Diastereoselective Complexation of Enantiopure Sulfinyl Dienes: The Preparation of Sulfinyl Iron(0) Dienes
作者:Robert S. Paley、Alfonso de Dios、Lara A. Estroff、Jennifer A. Lafontaine、Carlos Montero、David J. McCulley、M. Belén Rubio、Maria Paz Ventura、Heather L. Weers、Roberto Fernández de la Pradilla、Sonia Castro、Rocío Dorado、Miguel Morente
DOI:10.1021/jo970693a
日期:1997.9.1
The preparation of a diverse array of enantiomerically pure 1- and 2-sulfinyl dienes has been achieved via Stille coupling of halovinyl sulfoxides and vinyl stannanes, hydrogenation of 1-sulfinyl-1-en-3-ynes, or vinylcupration of 1-sulfinyl alkynes. Formation of the corresponding sulfinyl diene iron(0) tricarbonyl complexes was accomplished by utilizing Fe(CO)(5)/NMO or (bda)Fe(CO)(3) as iron(0) tricarbonyl transfer reagents. Installation of the iron(0) tricarbonyl fragment was shown to be highly diastereoselective (10-16:1) for (R)-(1Z)-1-sulfinyl dienes, most likely as a result of allylic 1,3-strain. The synthesis of a 1-sulfinyl-1,3,8,10-tetraene is also described.