Enantioselective synthesis of 1,2,3,4-tetrahydroquinoline-4-ols and 2,3-dihydroquinolin-4(1H)-ones via a sequential asymmetric hydroxylation/diastereoselective oxidation process using Rhodococcus equi ZMU-LK19
A cascade biocatalysis system containing asymmetric hydroxylation and diastereoselective oxidation was developed using Rhodococcus equi ZMU-LK19, which gave chiral 2-substituted-1,2,3,4-tetrahydroquinoline-4-ols (2) (up to 57% isolated yield, 99:1 dr, and >99%...
Per-6-amino-β-cyclodextrin as a Chiral Base Catalyst Promoting One-Pot Asymmetric Synthesis of 2-Aryl-2,3-dihydro-4-quinolones
作者:Kuppusamy Kanagaraj、Kasi Pitchumani
DOI:10.1021/jo302173a
日期:2013.1.18
A highly efficient one-pot synthesis of enantiomerically enriched 2-aryl-2,3-dihydroquinolin-4(1H)-ones has been carried out for the first time using per-6-ABCD as a supramolecular host, chiral base catalyst, and a reusable promoter to give the corresponding scaffold with high yield (up to 99%) and enantiomeric excess (up to 99%). The catalyst is recovered and reused without loss in its activity.
Conjugate Addition of Lithium <i>N</i>-Phenyl-<i>N</i>-(α-methylbenzyl)amide: Application to the Asymmetric Synthesis of (<i>R</i>)-(−)-Angustureine
作者:Scott A. Bentley、Stephen G. Davies、James A. Lee、Paul M. Roberts、James E. Thomson
DOI:10.1021/ol200625h
日期:2011.5.20
The conjugate addition of lithium (R)-N-phenyl-N-(α-methylbenzyl)amide to a range of α,β-unsaturated 4-methoxyphenyl esters proceeds with excellent levels of diastereoselectivity to give the corresponding β-amino esters in good yield and as single diastereoisomers (>99:1 dr). The synthetic utility of this methodology has been demonstrated via the short and concise asymmetricsynthesis of the tetrahydroquinoline