Discovery of novel spiro-piperidine derivatives as highly potent and selective melanin-concentrating hormone 1 receptor antagonists
摘要:
Optimization of high-throughput screening hit 1a led to the identification of a novel spiro-piperidine class of melanin-concentrating hormone 1 receptor (MCH-1R) antagonists. Compound 3c was identified as a highly potent and selective MCH-1R antagonist, which has an IC50 value of 0.09 nM at hMCH-1R. The synthesis and structure-activity relationships of the novel spiro-piperidine MCH-1R antagonists are described. (C) 2009 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Aerobic Dehydrogenative Aromatization of Cyclohexanone Imines to Arylamines
摘要:
Dehydrogenative aromatization of cyclohexanone imines to arylamines has been achieved using a palladium catalyst under aerobic conditions. The reaction is applicable to a variety of imines that are either preformed or generated in situ from cyclohexanone derivatives and aryl or alkylamines.
A Tetraarylpyrrole‐Based Phosphine Ligand for the Palladium‐Catalyzed Amination of Aryl Chlorides
作者:Masahiro Sai
DOI:10.1002/adsc.202100731
日期:2021.12.21
A tetraarylpyrrole-based phosphine ligand L1 in combination with Pd(dba)2 provided a catalyst for the Buchwald-Hartwig amination reaction. A variety of amines were rapidly coupled with aryl chlorides at a Pd loading of 0.5 mol%. The selective monoarylation of aliphatic primary amines was achieved in the presence of 0.8 equiv. water. Comparison experiments were also conducted, which revealed that the
In general, enantioselective C–H functionalization of N-monosubstituted anilines is a highly challenging task owing to the competitive chemoselective N–H bond insertion reactions. In this paper, we reported a direct highly chemo-, site-, and enantioselective para C–H aminoalkylation of N-monosubstituted anilinederivatives with isatin-derived ketimines in the presence of chiral phosphoric acids (CPAs)
P<sup>(III)</sup>-Promoted Reductive Coupling of Aromatic and Aliphatic Nitro Compounds with Grignard Reagents
作者:Shan-Shui Meng、Fei Li、Xiaowen Tang、Albert S. C. Chan
DOI:10.1021/acs.orglett.3c01167
日期:2023.5.26
coupling of nitro compounds with Grignard reagents is described. Polyfunctional and pharmaceutically relevant diarylamines were generated by this reaction in moderate to high yields. Aliphatic nitro compounds that are highly challenging substrates undergo a combination of α-arylation and reductive coupling to afford the α-arylated arylamines efficiently. A series of valuable biaryl compounds with polyfluorinated