A BF3-mediated dominodehydration/electrophiliccyclization of silylalkynols to form 2,3-fusedtricyclicbenzofulvenes was achieved. In the latter step, in situ generated BF3·OH2 enables the electrophilic activation of alkynes. The predominant Z-selectivity of the reaction is also discussed.
Dichloro[(2-dimethylamino)propyldiphenylphosphine]palladium(II) (PdCl<sub>2</sub>(alaphos)): An Efficient Catalyst for Cross-Coupling of Aryl Triflates with Alkynyl Grignard Reagents<sup>1</sup>
作者:Takashi Kamikawa、Tamio Hayashi
DOI:10.1021/jo981191f
日期:1998.11.1
Dichloro[(2-dimethylamino)propyldiphenylphosphine]palladium (PdCl2(alaphos)) was found to be much more effective as catalyst than other palladium complexes for cross-coupling of aryl triflates with alkynyl Grignard reagents. Reaction of bromoaryl triflates with alkynyl Grignard reagents in the presence of PdCl2(alaphos) catalyst gave high yields of alkynyl arene bromides, which were formed by selective replacement of triflate by alkynyl group.