Enantioselective Cyclizations of Silyloxyenynes Catalyzed by Cationic Metal Phosphine Complexes
作者:Jean-François Brazeau、Suyan Zhang、Ignacio Colomer、Britton K. Corkey、F. Dean Toste
DOI:10.1021/ja210388g
日期:2012.2.8
discovery of complementary methods for enantioselective transition metal-catalyzed cyclization with silyloxyenynes has been accomplished using chiral phosphine ligands. Under palladium catalysis, 1,6-silyloxyenynes bearing a terminal alkyne led to the desired five-membered ring with high enantioselectivities (up to 91% ee). As for reactions under cationicgold catalysis, 1,6- and 1,5-silyloxyenynes