Design of neutral, mono- or di-cationic water-soluble trihydrazidophosphoradamantanes
摘要:
The versatile behavior of a trihydrazidophosphoradamantane allowing the synthesis of a variety of neutral, mono- or di-cationic water-soluble molecules of potential interest for biphasic catalysis is reported. (c) 2006 Elsevier Ltd. All rights reserved.
New families of monomeric to dendritic, and monocationic to multicationic (PNP) compounds have been prepared and tested as catalysts in halogenexchange (Halex) reactions. Some of them allow an increase in the efficiency of these reactions which are performed in some cases under the mildest conditions reported up to now.
Exploring Rhodium(I) Complexes [RhCl(COD)(PR<sub>3</sub>)] (COD = 1,5-Cyclooctadiene) as Catalysts for Nitrile Hydration Reactions in Water: The Aminophosphines Make the Difference
Several rhodium(I) complexes, [RhCl(COD)-(PR3)], containing potentially cooperative phosphine ligands, have been synthesized and evaluated as catalysts for the selective hydration of organonitriles into amides in water. Among the different phosphines screened, those of general composition P(NR2)(3) led to the best results. In particular, complex [RhCl(COD)P(NMe2)(3)}] was able to promote the selective hydration of a large range of nitriles in water without the assistance of any additive, showing a particularly high activity with heteroaromatic and heteroaliphatic substrates. Employing this catalyst, the antiepileptic drug rufinamide was synthesized in high yield by hydration of 4-cyano-1-(2,6-difluorobenzyl)-1H-1,2,3-triazole. For this particular transformation, complex [RhCl(COD)P(NMe2)(3)}] resulted more effective than related ruthenium catalysts.
Reactivite de quelques phosphor(III)adamantanes et de quelques analogues tricycliques