The Synthesis of Some Derivatives Based on the 4-Benzyl-1H-pyrazole-3,5-diamine Core
摘要:
The three-step synthesis of 4-benzyl-1H-pyrazole-3,5-diamines 2 from commercially available aldehydes 3 is given. The Knoevenagel condensation was utilized to assemble the initial carbon framework, resulting in the benzylidenemalononitriles 4 which were directly transformed by the reduction of the electron deficient C=C bond to benzylmalononitriles 5. Subsequent cycloaddition of hydrazine with 5 afforded the desired pyrazoles 2. Due to the high similarity with 4-arylazo-1H-pyrazole-3,5-diamines, the biological activities of the 4-benzyl-1H-pyrazole-3,5-diamines 2 were evaluated while focusing on the inhibition of cyclin-dependent kinases (CDKs), but no significant results were obtained.
Novel Pyrimidine- And Triazine-Hepcidine Antagonists
申请人:Dürrenberger Franz
公开号:US20120202806A1
公开(公告)日:2012-08-09
The present invention relates to new hepcidin antagonists, pharmaceutical compositions containing them and the use thereof as a drug, in particular for the treatment of iron metabolism disorders such as, in particular, iron deficiency diseases and anaemia, in particular anaemia associated with chronic inflammatory disease (ACD: anaemia of chronic disease and AI: anaemia of inflammation).
Mn-Catalyzed Electrochemical Chloroalkylation of Alkenes
作者:Niankai Fu、Yifan Shen、Anthony R. Allen、Lu Song、Atsushi Ozaki、Song Lin
DOI:10.1021/acscatal.8b03209
日期:2019.1.4
The heterodifunctionalization of alkenes is an efficient method for synthesizing highly functionalized organic molecules. In this report, we describe the use of anodically coupled electrolysis for the catalytic chloroalkylation of alkenes—a reaction that constructs vicinal C–C and C–Cl bonds in a single synthetic operation—from malononitriles or cyanoacetates and NaCl. Knowledge of the persistent radical
condensation–reduction approach, which was carried out in water, has been reported. Using Hantzsch esters as reducing agent, under the promotion of base, a variety of reduced Knoevenagel adducts could be easily prepared by direct alkylation of malononitrile, ethyl 2-cyanoacetate, and 2-(4-nitrophenyl)acetonitrile, respectively. Meanwhile, a gram-scale synthesis of the protocol was also realized with excellent
Disclosed herein are KCNQ potassium channels modulators of formula (I)
wherein R
1
, R
2
, R
3
, R
4
, and R
5
are as defined in the specification. Compositions comprising such compounds; and methods for treating conditions and disorders using such compounds and compositions are also described.
A novel bifunctional Pd–ZIF-8/rGO catalyst with spatially separated active sites for the tandem Knoevenagel condensation–reduction reaction
作者:Hefang Wang、Yansu Wang、Aizhong Jia、Cunyue Wang、Luming Wu、Yongfang Yang、Yanji Wang
DOI:10.1039/c7cy01725a
日期:——
microscopy (SEM) and transmission electron microscopy (TEM). Pd–ZIF-8/rGO shows excellent catalytic performance in the tandemreaction with 100% benzaldehyde conversion and 98.3% selectivity to benzylmalononitrile. The excellent catalytic performance of Pd–ZIF-8/rGO in the tandemreaction is due to the high catalytic activities of spatially separated Pd NPs and ZIF-8 active sites and concentrated reactants