A new method for synthesizing polyalkylated/arylated nicotinates is established using a condensation of enamino esters with enones in the presence of FeCl3. This method facilitates the introduction of alkyl or...
A convenient, efficient, and practical method for the synthesis of β-indolylketones via a condensation of indole, aromatic aldehydes, and deoxybenzoin under ultrasonic irradiation was described. It provided a novel base-promoted approach for the one-pot synthesis of β-indolylketones.
Enantioselective synthesis of 2-amino-4H-pyrans via the organocatalytic cascade reaction of malononitrile and α-substituted chalcones
作者:Zhi-Peng Hu、Wei-Juan Wang、Xiao-Gang Yin、Xue-Jing Zhang、Ming Yan
DOI:10.1016/j.tetasy.2012.03.018
日期:2012.4
An organocatalytic cascade reaction of malononitrile and a-substituted chalcones has been developed for the synthesis of chiral multisubstituted 2-amino-4H-pyran derivatives. A series of chiral primary/tertiary amines and cinchona alkaloids were examined as the catalysts. Quinine was found to be the most efficient catalyst in the absence of any additive. The alpha-substitutents of the chalcones had a siginificant effect on the yield and the enantioselectivity. A number of multisubstituted 2-amino-4H-pyrans were obtained in excellent yields and enantioselectivities. (C) 2012 Elsevier Ltd. All rights reserved.
Lal,B. et al., Indian Journal of Chemistry, 1973, vol. 11, p. 423 - 426
作者:Lal,B. et al.
DOI:——
日期:——
Ru-catalyzed asymmetric hydrogenation of α,β-unsaturated ketones <i>via</i> a hydrogenation/isomerization cascade
作者:Kun Wang、Saisai Niu、Weijun Tang、Dong Xue、Jianliang Xiao、Hongfeng Li、Chao Wang
DOI:10.1039/d4cc00356j
日期:2024.4.16
Ru-catalyzed asymmetric hydrogenation of α-substituted α,β-unsaturatedketones has been developed for the enantioselective synthesis of chiral α-substituted secondary alcohols with high diastereo- and enantioselectivities (up to >99 : 1 dr, 98% ee). Mechanistic experiments suggest that the reaction proceeds via a Ru-catalyzed asymmetric hydrogenation of the CO bond in concert with a base-promoted allylic