Can Heteroarenes/Arenes Be Hydrogenated Over Catalytic Pd/C Under Ambient Conditions?
作者:Nao Tanaka、Toyonobu Usuki
DOI:10.1002/ejoc.202000695
日期:2020.9.14
Pd/C‐mediated dearomatic hydrogenation underambientconditions such as balloon pressure and room temperature can be a powerful tool for constructing alicyclic skeletons. Density functional theory calculations have been performed to confirm the mechanistic aspects and the utility of the established methodology has been demonstrated by donepezil synthesis.
Novel heterogeneous catalysts were prepared by impregnation of titania with a solution of cobalt acetate/melamine and subsequent pyrolysis. The resulting materials show an unusual nitrogen‐modified titanium structure through partial implementation of nitrogen into the support. The optimal catalyst displayed good activity and selectivity for challenging pyridinehydrogenation under acid free conditions
Scalable and Straightforward Synthesis of All Isomeric (Cyclo)alkylpiperidines
作者:Andrii I. Subota、Anton O. Lutsenko、Bohdan V. Vashchenko、Dmitriy M. Volochnyuk、Vitalina Levchenko、Yurii V. Dmytriv、Eduard B. Rusanov、Alina O. Gorlova、Sergey V. Ryabukhin、Oleksandr O. Grygorenko
DOI:10.1002/ejoc.201900450
日期:2019.6.16
C‐3, or C‐4 positions of the piperidine ring based on the formal sp3–sp3 retrosynthetic disconnection is described. Catalytic hydrogenation of these adducts could be performed selectively for the synthesis of (cyclo)alkylpiperidines or the corresponding saturated amino alcohols on up to a 0.5 kg scale.
INHIBITORS OF N-ACYLPHOSPHATIDYLETHANOLAMINE PHOSPHOLIPASE D (NAPE-PLD)
申请人:Universiteit Leiden
公开号:EP3575287A1
公开(公告)日:2019-12-04
The invention relates to a compound of the formula (I) as novel inhibitor of N-acylphosphatidylethanolamine phospholipase D (NAPE-PLD), and to use thereof for the prophylaxis or treatment of diseases associated with NAPE-PLD.
wherein
in a ring A, X1 is N, or CR4; X2 is N or CR5; X3 is N or CH;
with the proviso that at least one of X1 and X3 is N.
Regio- and Stereoselective Alkylation of Pyridine-<i>N</i>-oxides: Synthesis of Substituted Piperidines and Pyridines
作者:Deepak Kumar Barange、Magnus T. Johnson、Andrew G. Cairns、Roger Olsson、Fredrik Almqvist
DOI:10.1021/acs.orglett.6b02667
日期:2016.12.16
Regio- and stereoselective addition of alkyl Grignard reagents to pyridine-N-oxides gave C2-alkylated N-hydroxy-1,2,5,6-tetrahydropyridines and trans-2,3-disubstituted N-hydroxy-1,2,5,6-tetrahydropyridines in good to excellent yields. These intermediates were aromatized or alternatively reduced in one-pot methodologies for efficient syntheses of alkylpyridines or piperidines, respectively. These reactions