Highly Enantioselective 1,4-Michael Additions of Nucleophiles to Unsaturated Aryl Ketones with Organocatalysis by Bifunctional Cinchona Alkaloids
作者:Cristina G. Oliva、Artur M. S. Silva、Diana I. S. P. Resende、Filipe A. A. Paz、José A. S. Cavaleiro
DOI:10.1002/ejoc.201000273
日期:——
The development of general and efficient asymmetric organocatalytic additions of malononitrile and nitromethane to 1,5-diarylpenta-2,4-dien-1-ones (cinnamylideneacetophenones) catalyzed by cinchona organocatalysts is reported. The reactions afforded excellent enantioselectivities (up to 99 %), high yields (up to 97 %), and exclusive 1,4-addition regioselectivities. The potential of these new enantioselective
and environmental friendly domino multicomponent reaction to construct new cyclohexanederivatives with five new stereocenters, one of them quaternary, under phase-transfer catalysis is reported. This novel one-pot reaction allows the transformation of very simple starting materials into pentasubstituted cyclohexanederivatives bearing hydroxy, nitro, and ketone moieties and involving the formation of
Synthesis, biological evaluation and QSAR studies of diarylpentanoid analogues as potential nitric oxideinhibitors
作者:S. M. Mohd Faudzi、S. W. Leong、F. Abas、M. F. F. Mohd Aluwi、K. Rullah、K. W. Lam、S. Ahmad、C. L. Tham、K. Shaari、N. H. Lajis
DOI:10.1039/c4md00541d
日期:——
A series of forty-five diarylpentadienone analogues were synthesized and were screened for their anti-inflammatory properties. Compound 7d had potent nitric oxide (NO) activity with an IC50 value of 10.24 μM.
A simple protocol for the synthesis of difluoromethylthiolated chromen-4-ones using elemental sulfur and ClCF2CO2Na as the difluoromethylthiolating agent is described. Three-component reactions of 2'-hydroxychalcones, ClCF2CO2Na, and sulfur under basic conditions using TEMPO as the oxidant afforded HCF2S-containing 4H-chromen-4-one and 9H-thieno[3,2-b]chromen-9-one derivatives in good yield. The protocol
In silico studies, nitric oxide, and cholinesterases inhibition activities of pyrazole and pyrazoline analogs of diarylpentanoids
作者:Siti Munirah Mohd Faudzi、S. Wei Leong、Faruk A. Auwal、Faridah Abas、Lam K. Wai、Syahida Ahmad、Chau L. Tham、Khozirah Shaari、Nordin H. Lajis、Bohari M. Yamin
DOI:10.1002/ardp.202000161
日期:2021.1
contrast, pyrazole 3a and pyrazoline 5a were found to be the most selective and effective BChE inhibitors over AChE. The data collected from the single‐crystal X‐ray diffraction analysis of compound 5a were then applied in a docking simulation to determine the potential binding interactions that were responsible for the anti‐BChE activity. The results obtained signify the potential of these pyrazole and