Protic pyridinium ionic liquid as a green and highly efficient catalyst for the synthesis of polyhydroquinoline derivatives via Hantzsch condensation in water
The four-component Hantzsch condensation reaction of dimedone, ethyl acetoacetate, ammonium acetate and various aromatic and aliphatic aldehydes in the presence of 2-methylpyridinium trifluoromethanesulfonate ([2-MPyH]OTf) as a green and highly efficient catalyst in water affords polyhydroquinoline derivatives in good to excellent yields.This reaction has been carried out in the presence of 1 mol% of [2-MPyH]OTf at room temperature. The described novel synthesis method proposes several advantages of short reaction times, high yields, mild condition, high melting point, simplicity and easy workup compared to the traditional method of synthesis. (C) 2012 Elsevier B.V. All rights reserved.
SUBSTITUTED DIHYDROPYRIDINES FOR SOMATIC EMBRYOGENESIS IN PLANTS
申请人:STICHTING DIENST LANDBOUWKUNDIG ONDERZOEK
公开号:US20150296779A1
公开(公告)日:2015-10-22
Cyclopentyl 2,7,7-trimethyl-5-oxo-4-(4-pyridinyl)-1,4,5,6,7,8-hexahydro-3-quinolinecarboxylate and similar compounds are potentiators of auxin-induced somatic embryogenesis in plants. In particular, the inventors have discovered certain of these compounds induce somatic embryogenesis in
Arabidopsis
in the presence of 2,4-D. Also tested is BAY K 8644. Methods of inducing somatic embryogenesis comprise exposing selected plant tissues, e.g. seed embryos, to auxins, e.g. 2.4-D and the compounds.
One-pot multi-component synthesis of polyhydroquinolines at ambient temperature
作者:K.A. Undale、T.S. Shaikh、D.S. Gaikwad、D.M. Pore
DOI:10.1016/j.crci.2010.09.009
日期:2011.5
Résumé An efficient and eco-friendly one-pot synthesis of polyhydroquinolines at ambient temperature from the multi-component reaction of aldehyde, 1,3-diketone, β-keto ester and ammonium acetate in ethanol medium is described. The probable mechanism of transformation is suggested. The features of this procedure are mild reaction conditions, no need of external catalyst, good yields and the operational simplicity at ambient temperature.