Categories: Synthesis of O-Heterocycles >
Synthesis of 3,4-dihydro-2H-pyrans
Recent Literature
An olefin metathesis/double bond migration sequence of allyl ethers to cyclic
enol ethers is catalyzed by first and second generation Grubbs' catalysts. These
ruthenium carbene complexes were activated to catalyze the double bond migration
by additioin of hydride sources, such as NaH or NaBH4.
B. Schmidt, Eur. J. Org. Chem., 2003, 816-819.
Hydrophobic ionic liquids such as [Bmim]PF6 are powerful media for
bis(oxazoline)-copper-catalyzed asymmetric hetero-Diels-Alder reactions, that
allow a convenient catalyst recycling. The reactivities and stereoselectivities
were comparable to those of the corresponding homogeneous reactions. Furthermore,
the reaction was remarkably accelerated in [Bmim]PF6 compared to
dichloromethane.
Y. J. Shin, C.-E. Yeom, M. Jeong, B. M. Kim, Synlett, 2008,
89-93.
