Copper-catalysed aerobic oxidation of alcohols using fluorous biphasic catalysis
摘要:
A copper(I) catalysed and TEMPO mediated fluorous biphasic oxidation of primary, secondary, allylic and benzylic alcohols with oxygen in the presence of a bipyridine ligand bearing perfluorinated ponytails is described. High chemoselectivities are observed in the oxidation of substituted cyclohexanols (substituted axial cyclohexanols react 6-8 times faster than the corresponding equatorial cyclohexanols). (C) 2002 Elsevier Science Ltd. All rights reserved.
Electrophilic amination of diorganozinc reagents by oxaziridines
作者:Mohammed Ghoraf、Joëlle Vidal
DOI:10.1016/j.tetlet.2008.10.049
日期:2008.12
amination of organozincreagents by oxaziridines has been studied. Diorganozinc reagents R2Zn (R = alkyl or aryl) react with N-Boc oxaziridine to afford N-Boc protected primary amines BocNHR in moderate to good yields. No additives are needed in this reaction, which proceeds at 0 °C. We suggest that the presence of two heteroatoms in oxaziridine allows Lewis baseactivation of the diorganozinc reagent.
Tris(2,6-diphenylbenzyl)amine (TDA) and tris(2,6-diphenylbenzyl)phosphine (TDP) with unique bowl-shaped structures: synthetic application of functionalized TDA to chemoselective silylation of benzylic alcohols
A new strategy for obtaining the formal steric hindrance of tertiary amines by remote steric factors is described by designing the bowl-shaped, structurally unique tris(2,6-diphenylbenzyl)amine (TDA). In addition to its structural uniqueness, TDA possesses the rich electronic atmosphere derived from three 2,6-diphenylbenzyl moieties, thereby allowing the chemoselective silylation of benzylic alcohols