One-pot asymmetric synthesis of 2-aryl-2,3-dihydro-4-quinolones catalyzed by amino acid-derived sulfonamides
作者:Haixing Zheng、Qi Liu、Saishuai Wen、Hua Yang、Yiming Luo
DOI:10.1016/j.tetasy.2013.05.028
日期:2013.8
approach to the asymmetricsynthesis of 2-aryl-2,3-dihydro-4-quinolones using amino-acid derived sulfonamides as organocatalysts, which can be easily prepared starting from l-proline, l-alanine, and l-phenylalanine, has been developed in high yields (up to 92%) and with moderate to good enantioselectivities (up to 74% ee). Additionally, opposite enantioselectivities for primary and secondary amino acid sulfonamides
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.
Highly Selective “Turn-On” Fluorescent and Colorimetric Sensing of Fluoride Ion Using 2-(2-Hydroxyphenyl)-2,3-dihydroquinolin-4(1 <i>H</i>)-one based on Excited-State Proton Transfer
作者:Kuppusamy Kanagaraj、Kasi Pitchumani
DOI:10.1002/asia.201300816
日期:2014.1
A simple, highlyselective and sensitive colorimetric system for the detection of fluorideion in an aqueous medium has been developed using 2‐(2‐hydroxyphenyl)‐2,3‐dihydroquinolin‐4(1H)‐one. This system allows selective “turn‐on” fluorescence detection of fluorideion, which is found to be dependent upon guest basicity. An excited‐state protontransfer is proposed to be the signaling mechanism, which