Synthesis, X-ray crystal structures and Horner–Wittig addition reactions of some protected β-aminophosphine oxides
作者:Neil Feeder、David J. Fox、Jonathan A. Medlock、Stuart Warren
DOI:10.1039/b201680j
日期:2002.4.26
Several protected β-aminophosphine oxides have been synthesised and investigated in the Horner–Wittig addition reaction. Crystalstructures of an enantiomerically pure β-amino phosphine oxide and a Horner–Wittig addition product are presented. Horner–Wittigreactions were typically poorly stereoselective, although the ratio of diastereoisomers can be influenced by the addition of lithium bromide.
[EN] TRANSFER HYDROGENATION PROCESS<br/>[FR] PROCEDE D'HYDROGENATION PAR TRANSFERT
申请人:AVECIA LTD
公开号:WO2001012574A1
公开(公告)日:2001-02-22
A catalytic transfer hydrogenation process is provided. The process can be employed to transfer hydrogenate N-substituted imines and iminium salts, which are preferably prochiral. The catalyst employed in the process is preferably a metal complex with one hydrocarbyl or cyclopentadienyl ligand and which is also coordinated to defined bidentate ligands. Preferred metals include rhodium, ruthenium and iridium. Preferred bidentate ligands are diamines and aminoalcohols, particularly those comprising chiral centres. The hydrogen donor is advantageously a mixture of triethylamine and formic acid. A process for the production of primary and secondary amines using the catalytic transfer hydrogenation of the N-substituted imines and iminium salts is also provided.
Manganese(III) Acetylacetonate-Mediated Phosphorylation of Enamides at Room Temperature
A highly Z‐selective phosphorylation by Manganese(III) acetylacetonate‐mediated cross‐dehydrogenative‐coupling of enamides and phosphine oxides has been developed under mild conditions. The reaction shows broad substrate scope and functional group compatibility. DFT studies revealed that the formation of Z‐products is presumably due to the presence of an intramolecular hydrogen bond. β‐Aminophosphine