58929-93-4Relevant academic research and scientific papers
Organocatalytic racemization of α-aryl propionates in the presence of water
Blasco, Maria Alfaro,Groeger, Harald
, p. 9 - 15 (2013)
An organocatalytic method for the racemization of α-aryl propionates, which proceeds even in the presence of an aqueous phase, has been developed, thus fulfilling a prerequisite for a dynamic kinetic resolution of corresponding esters with hydrolase as a biocatalyst. The desired racemization of ethyl 2-phenylpropionate and 2-ibuprofen ethyl ester as substrates has been achieved in a two-phase system. As preferred organocatalysts for the racemization, 1,8-diazabicyclo[5.4.0]undec-7-ene and 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) have been used. Copyright Taylor & Francis Group, LLC.
The synthesis of alkylated or acylated nitroarene cyclopentadienyliron complexes: An alternative approach to the synthesis of arylated alkanoates
Abd-El-Aziz, Alaa S.,Boraie, Waleed,Al-Salem, Najceb,Sadek, Salwa A.,Epp, Karen M.
, p. 1469 - 1479 (2007/10/03)
Time-dependent oxidation of η6-alkylaniline-η5-cyclopentadienyliron hexafluorophosphates, 17-32, allows for the preparation of nitrobenzene complexes with alkyl 33-48 or keto 49 substituents. Alkylnitroarene complexes are prepared by the oxidation of their corresponding aniline complexes with H2O2 in CF3CO2H for 20 min. An increase in the reaction time to 24 h gives rise to nitroarene complexes with keto substituents in lower yields. The use of nitroarenes as starting materials in the synthesis of alkanoates is of importance since it allows for the preparation of a large number of this class of compounds with a variety of alkyl substituents. Two different approaches have been utilized to allow for the synthesis of alkanoates. The first approach involves nucleophilic aromatic substitution of alkylnitrobenzene complexes with ethyl alkylacetoacetates followed by demetallation to give the alkanoates. This methodology allows for the preparation of these esters with a variety of alkyl substituents in either the meta or para positions. Another route outlines the reaction of phenylsulfonylacetonitrile with nitroarene complexes to prepare alkanoic acid precursors with alkyl substituents in the ortho, meta and para positions. The preparation of a larger pool of nitroarene complexes clearly demonstrates the advantage of using the cyclopentadienyliron arene complexes in the synthesis of alkanoates or their precursors, arylated phenylsulfonylacetonitriles, over traditional synthetic routes.
