the first time to synthesize pharmaceutically important α-aminoketonesfrom readily available benzylic secondary alcohols and amines using N-bromosuccinimide. This new reaction proceeds via three consecutive steps involving oxidation of alcohols, α-bromination of ketones, and nucleophilic substitution of α-bromo ketones to give α-aminoketones. Importantly, this novel one-pot greener reaction avoids
Asymmetric synthesis of N-diphenylphosphinoylamines by solvent-free enantioselective addition of dialkylzincs to N-diphenylphosphinoylimines
作者:Itaru Sato、Ryo Kodaka、Kenso Soai
DOI:10.1039/b106775n
日期:2001.11.15
Solvent-free enantioselective addition of dialkylzincs to N-diphenylphosphinoylimines in the presence of chiral 2-morpholino-1-phenylpropan-1-ol affords N-diphenylphosphinoylamines with up to 97% ee. The reaction in the solvent-free system is faster than in organic solvents.
Enantioselective and Diastereoselective Construction of Chiral Amino Alcohols by Iridium–f-Amphox-Catalyzed Asymmetric Hydrogenation via Dynamic Kinetic Resolution
The iridium–f-amphox-catalyzed asymmetric hydrogenation of racemic α-amino β-unfunctionalized ketones proceeds via a DKR (dynamickineticresolution) process for the construction of various chiral N,N-disubstituted α-amino β-unfunctionalized alcohols in quantitative yields with excellent enantioselectivities and diastereoselectivities (all products >99% ee and >99:1 dr, TON up to 100 000). Importantly
Regio- and Stereospecific Syntheses of <i>syn-</i> and <i>anti-</i>1,2-Imidazolylpropylamines from the Reaction of 1,1‘-Carbonyldiimidazole with <i>syn-</i> and <i>anti-</i>1,2-Amino Alcohols
作者:Mark J. Mulvihill、Cara Cesario、Vanessa Smith、Patricia Beck、Anthony Nigro
DOI:10.1021/jo049677l
日期:2004.7.1
The regio- and stereospecific conversion of syn- and anti-1,2-amino alcohols to their respective syn- and anti-1,2-imidazolylpropylamines via treatment with 1,1‘-carbonyldiimidazole is described. The rationale behind the regio- and stereospecific nature as well as the generality of the reaction is discussed.