Novel Microwave-Assisted One-Pot Synthesis of Isoxazoles by a Three-Component Coupling-Cycloaddition Sequence
作者:Thomas Müller、Benjamin Willy、Frank Rominger
DOI:10.1055/s-2007-1000856
日期:2008.1
The consecutive Sonogashira coupling of acid chlorides with terminal alkynes, followed by 1,3-dipolar cycloaddition under dielectric heating of in situ generated nitrile oxides from hydroximinoyl chlorides furnishes isoxazoles in moderate to good yields in the sense of a one-pot three-component reaction.
Enantioselective Hydrogenation and Transfer Hydrogenation of Bulky Ketones Catalysed by a Ruthenium Complex of a Chiral Tridentate Ligand
作者:M. Belén Díaz-Valenzuela、Scott D. Phillips、Marcia B. France、Mary E. Gunn、Matthew L. Clarke
DOI:10.1002/chem.200801929
日期:2009.1.19
substrates such as bulky heterocyclic ketones. Unusually for a pressure hydrogenation catalyst, similar enantioselectivity can be obtained under transferhydrogenation conditions. The transferhydrogenations are somewhat slower than the pressure hydrogenations, but this drawback is readily overcome, since we have discovered that a microwave accelerated transferhydrogenation of the above ketones occurs within