Exploring the Synthetic Applicability of a Cyanobacterium Nitrilase as Catalyst for Nitrile Hydrolysis
作者:Chandrani Mukherjee、Dunming Zhu、Edward R. Biehl、Ling Hua
DOI:10.1002/ejoc.200600699
日期:2006.12
specificity and syntheticapplicability of the nitrilase from cyanobacterium Synechocystis sp. strain PCC 6803 have been examined. This nitrilase catalyzed the hydrolysis of both aromatic and aliphatic nitriles to the corresponding acids in high yields. Furthermore, the stereoselective hydrolysis of phenyl-substituted β-hydroxy nitriles to (S)-enriched β-hydroxy carboxylic acids and selective hydrolysis of α
One-pot Sequence for the Decarboxylation of α-Amino Acids
作者:Bernard T. Golding、Gilles Laval
DOI:10.1055/s-2003-37512
日期:——
Treatment of an α-amino acid with N-bromosuccinimide in water at pH 5 or in an alcoholic-aqueous ammonium chloride mixture, followed by addition of nickel(II) chloride and sodium borohydride, effected an overall decarboxylation via an intermediate nitrile to afford the corresponding amine in good yield.
Rhodium to the rescue: The formal aldol products of carboxamides (CONH2) were obtained by using a RhI(OR) (R=H, Me) catalyst under essentially neutral pH and ambient conditions. This novel aldol strategy is based on the catalytic aldol‐type reaction of nitriles, followed by hydration of the nitrile functionality (R1=aromatic or aliphatic, R2 and R3=H or alkyl; see scheme).
alternative to classical cyanomethylation is possible by using electrogenerated bases (EGBs), obtained by electroreduction of aryl halides in an undivided cell fitted with a cadmium coated cathode and a sacrificial magnesium anode. Acetonitrile is used both as solvent and as hydrogen-active compound. A coupling reaction with various electrophilic compounds was carried out. When the electrophilic compound
Synthesis and Reactivity of 4-Aralkoxy(alkoxy)-5,6-dihydro-2H-1,3-oxazine-2-ones
作者:Thomas Kurz、Mehdi Khankischpur
DOI:10.1055/s-0029-1217023
日期:2009.12
The synthesis of previously unreported 4-aralkoxy(alkoxy)-5,6-dihydro-2H-1,3-oxazine-2-ones, as well as their transformation into various novel 4-functionalized 5,6-dihydro-2H-1,3-oxazine-2-ones and 1,3-oxazinane-2-ones is described.