Categories: Synthesis of O-Heterocycles
Synthesis of 2,5-Dihydrofurans
Recent Literature
Allenylidene-ruthenium complexes on protonation with HOTf are rearranged to
indenylidene-ruthenium complexes, which are efficient catalyst precursors for
ring-opening metathesis polymerization, ring-closing metathesis and enyne
metathesis of a variety of substrates.
R. Castarlenas, C. Vovard, C. Fischmeister, P. H. Dixneuf, J. Am. Chem. Soc.,
2006, 128, 4079-4089.
The use of cationic silver (AgSbF4) as a catalyst for intra- and
intermolecular alkyne-carbonyl coupling is described.
J. U. Rhee, M. J. Krische, Org. Lett., 2005, 7, 2493-2495.
Conversion of unsaturated ketones and aldehydes derived from the
cycloisomerization of primary and secondary propargyl diynols in the presence of
[CpRu(CH3CN)3]PF6 to 1-azatrienes and a
subsequent electrocyclization-dehydration provides pyridines with excellent
regiocontrol.
B. M. Trost, A. C. Gutierrez, Org. Lett., 2007,
9, 1473-1476.
The reduction of various hetero- and carbocyclic aromatic compounds under
ammonia free conditions uses LiDBB as a source of electrons,
bis(methoxyethyl)amine (BMEA) as a protonating agent, and THF as a solvent. In
contrast to Birch type conditions, the described ammonia free conditions allow
the use of reactive electrophiles.
T. J. Donohoe, D. House, J. Org. Chem.,
2002, 67, 5015-5018.
