Asymmetric Hydrolytic and Aminolytic Kinetic Resolution of Racemic Epoxides using Recyclable Macrocyclic Chiral Cobalt(III) Salen Complexes
作者:Rajkumar Tak、Manish Kumar、Tusharkumar Menapara、Naveen Gupta、Rukhsana I. Kureshy、Noor-ul H. Khan、E. Suresh
DOI:10.1002/adsc.201700788
日期:2017.11.23
New chiral macrocyclic cobalt(III) salen complexes were synthesized and used as catalyst for the asymmetric kinetic resolution (AKR) of terminalepoxides and glycidyl ethers with aromatic/aliphatic amines and water as nucleophiles. This is the first occasion where a Co(III) salen complex demonstrated its ability to catalyze AKR as well as hydrolytic kinetic resolution (HKR) reactions. Excellent enantiomeric
Magnetic Nano Fe3O4 Catalyzed Solvent-Free Stereo- and Regioselective Aminolysis of Epoxides by Amines; a Green Method for the Synthesis of β-Amino Alcohols
作者:Srinivasarao Babu、Amit Kumar、Ramarao Parella
DOI:10.1055/s-0033-1340844
日期:——
We report the use of magnetic nano Fe3O4 as a mild heterogeneous catalyst for the aminolysis of epoxides with amines. The approach constitutes a green method for the formation of a variety of β-amino alcohols with very high stereo- and regioselectivity under solvent-free and ambient reaction conditions. The aminolysis of chiral epoxides with amines gave the corresponding chiral β-amino alcohols with
The present invention relates to a crystalline metal organic framework which comprises repeating units of formula (RR)-(IA)or (SS)-(IA)or (RS)-(IA) or (SR)-(IA); or alternatively of formula (RR)-(IB) or (SS)-(IB) or (RS)-(IB) or (SR)-(IB) and acomposition containing it. It also relates to processes for their preparation and theiruses as a separation agent and as a catalyst.
Green Regio- and Enantioselective Aminolysis Catalyzed by Graphite and Graphene Oxide under Solvent-Free Conditions
作者:Maria Rosaria Acocella、Luciana D'Urso、Mario Maggio、Gaetano Guerra
DOI:10.1002/cctc.201600241
日期:2016.6.7
The ring‐opening reactions of epoxides with amines were efficiently and regioselectively catalyzed by high‐surface‐area graphite and graphene oxide under metal‐free and solvent‐free conditions. For epoxides without aryl groups, catalytic activity was observed only for graphene oxide, and hence, the activity must have been due to its acidic groups. For styrene oxide, instead, graphite and graphene oxide
The homochiral metal-organic framework TAMOF-1 was used as a heterogeneous catalyst in the kineticresolution of styrene oxide by ring opening reactions with anilines. The linear products underwent a second KR resulting in an amplification of the final stereoselectivity (subtractive Horeau amplification effect). Computational studies rationalized the two successive KR while providing a deep understanding