Ruthenium-Catalyzed C–H Silylation of 1-Arylpyrazole Derivatives and Fluoride-Mediated Carboxylation: Use of Two Nitrogen Atoms of the Pyrazole Group
摘要:
Carboxylation of 1-arylpyrazole derivatives was developed using a ruthenium-catalyzed ortho silylation in conjunction with fluoride-mediated carboxylation with carbon dioxide. The two nitrogen atoms of pyrazole play crucial roles in promoting ortho silylation via the formation of a five-membered ruthenacycle and in accelerating aryl anion formation by lowering the electron density of the aromatic ring.
Ruthenium-Catalyzed C–H Silylation of 1-Arylpyrazole Derivatives and Fluoride-Mediated Carboxylation: Use of Two Nitrogen Atoms of the Pyrazole Group
摘要:
Carboxylation of 1-arylpyrazole derivatives was developed using a ruthenium-catalyzed ortho silylation in conjunction with fluoride-mediated carboxylation with carbon dioxide. The two nitrogen atoms of pyrazole play crucial roles in promoting ortho silylation via the formation of a five-membered ruthenacycle and in accelerating aryl anion formation by lowering the electron density of the aromatic ring.
This invention relates to compounds of formula (I), a process for their preparation, pharmaceutical compositions containing them and their use in the treatment of conditions having an association with the orexin sub-type 1 receptor. Ar, R1, R2, R3, R4, R5 have meanings given in the description.
This invention relates to compounds of formula (I) a process for their preparation, pharmaceutical compositions containing them and their use in the treatment of conditions having an association with the orexin sub-type 1 receptor. Ar, R1, R2 and R3 have meanings given in the description.
Discovery and optimisation of 1-acyl-2-benzylpyrrolidines as potent dual orexin receptor antagonists
作者:Jodi T. Williams、John Gatfield、Catherine Roch、Alexander Treiber、Francois Jenck、Martin H. Bolli、Christine Brotschi、Thierry Sifferlen、Bibia Heidmann、Christoph Boss
DOI:10.1039/c5md00074b
日期:——
1-acyl-2-benzylpyrrolidines were discovered as potent and competitive dualorexinreceptorantagonists. Metabolic stability was improved to afford oral exposure, and aqueous solubility was increased by twentyfold, providing compounds suitable for preclinical evaluation. Compound 27 showed insurmountable antagonism at both orexin 1 and orexin 2 receptor subtypes and displayed a comparable sleep-promoting
This invention relates to compounds of formula (I), a process for their preparation, pharmaceutical compositions containing them and their use in the treatment of conditions having an association with the orexin sub-type 1 receptor. Ar, R1, R2, R3, R4, R5, R6 and R7 have meanings given in the description.
Regiodivergent C−H and Decarboxylative C−C Alkylation by Ruthenium Catalysis:
<i>ortho</i>
versus
<i>meta</i>
Position‐Selectivity
作者:Korkit Korvorapun、Marc Moselage、Julia Struwe、Torben Rogge、Antonis M. Messinis、Lutz Ackermann
DOI:10.1002/anie.202007144
日期:2020.10.12
Ruthenium(II)biscarboxylate complexes enabled the selectivealkylation of C−H and C−C bonds at the ortho‐ or meta‐position. ortho‐C−HAlkylations were achieved with 4‐, 5‐ as well as 6‐membered halocycloalkanes. Furthermore, the judicious choice of the directing group allowed for a full control of ortho‐/meta‐selectivities. Detailed mechanistic studies by experiment and computation were performed and