Metal-Free<i>meta</i>-Selective Alkyne Oxyarylation with Pyridine<i>N</i>-Oxides: Rapid Assembly of Metyrapone Analogues
作者:Xiangyu Chen、Stefan A. Ruider、Rolf W. Hartmann、Leticia González、Nuno Maulide
DOI:10.1002/anie.201607988
日期:2016.12.5
An efficient metal‐free oxyarylation of electron‐poor alkynes with pyridine N‐oxides has been developed. This transformation affords meta‐substituted pyridines analogous to the drug metyrapone in high regioselectivities. Density functional theory (DFT) calculations provided important insight into the mechanism. Evaluation of the inhibitory properties revealed the most active CYP11B1 inhibitor of these
Straightforward Strategy for the Stereoselective Synthesis of Spiro-Fused (C-5)Isoxazolino- or (C-3)Pyrazolino-(C-3)quinolin-2-ones from Baylis-Hillman Adducts by 1,3-Dipolar Cycloaddition and Reductive Cyclization
作者:Virender Singh、Vijay Singh、Sanjay Batra
DOI:10.1002/ejoc.200800746
日期:2008.11
A straightforward and general approach for the stereoselectivesynthesis of spiro-fused (C-5)isoxazolino- or (C-3)pyrazolino-(C-3)quinolin-2-onesfrom the adducts offorded from the Baylis–Hillman reaction of 2-nitrobenzaldehyde and ethyl acrylate by sequential 1,3-dipolarcycloaddition and reductivecyclization is presented. It was found that the reductivecyclization of the isoxazoline derivatives