Alkynylation of heterocyclic compounds using hypervalent iodine reagent
作者:M. Kamlar、I. Císařová、J. Veselý
DOI:10.1039/c4ob02625j
日期:——
The alkynylation of various nitrogen- and/or sulphur-containing heterocyclic compounds using hypervalent iodine TMS-EBX by utilization of tertiary amines under mild conditions is described.
描述了利用三级胺在温和条件下利用高价碘TMS-EBX对各种含氮和/或硫杂环化合物进行炔基化的过程。
Chiral iminophosphorane catalyzed asymmetric sulfenylation of 4-substituted pyrazolones
作者:Jianwei Han、Yanxia Zhang、Xin-Yan Wu、Henry N. C. Wong
DOI:10.1039/c8cc09049a
日期:——
An excellent level of enantioselectivity in asymmetric sulfenylation of 4-substituted pyrazolones was achieved with chiral iminophosphorane as the organocatalyst under continuum solvation conditions (up to 99% ee). Importantly, this catalytic process features high efficiency with excellent enantioselectivities, easy separation of products, low catalytic loadings and scale-up to grams without loss of
Design, Synthesis, and Structure‐Activity Relationship Study of Pyrazolones as Potent Inhibitors of Pancreatic Lipase
作者:Jing Zhang、Yang Yang、Xing‐Kai Qian、Pei‐Fang Song、Yi‐Shu Zhao、Xiao‐Qing Guan、Li‐Wei Zou、Xiaoze Bao、Hong Wang
DOI:10.1002/cmdc.202000850
日期:2021.5.18
mixed-competitive inhibitor of PL (IC50=0.30 μM). In addition, P32 displayed some selectivity over other known serine hydrolases. A molecular docking study for P32 demonstrated that the inhibitoryactivity of P32 towards PL could be attributed to the π-π interactions of 2-naphthyl unit (R1) and hydrophobic interactions of phenylmoiety (R3) with the active site of PL. Thus, P32 could serve as promising lead
Highly selective: The title reaction is achieved with high enantiomeric and geometric control and thermodynamically unstable (Z)‐enone derivatives are obtained as the major products (see scheme). The procedure tolerates a wide range of substrates to generate optically active pyrazolones with vinyl‐substituted quaternary stereocenters.
A highly enantioselective regiodivergent addition of alkoxyallenes to pyrazolones was developed to afford multiply functionalized alkylated products bearing a quaternary carbon stereocenter in high yields with excellent stereoselectivities. One approach is enabled by palladiumcatalysis, thus leading to branched allylic pyrazol‐5‐ones under mild reaction conditions. The other is catalyzed by a chiral