Controlling the Exothermicity of O-Arylation by Evaporative Cooling during the Process Development of Fluoxetine Hydrochloride
摘要:
This study illustrates the optimization of the O-arylation step of fluoxetine hydrochloride (1) synthesis. In the entire process, this is the most critical step that dictates the yield and quality of the product. The highlight of the process is the concept of evaporative cooling that was employed in manipulating the above highly exothermic reaction by introducing toluene as the cosolvent. The evaporative cooling not only aided in getting an efficient procedure but also increased the yield of 1 and simplified the work-up procedure. This was a protective approach adopted for process safety, considering the worst-case scenario in the plant.
Semiheterogeneous Dual Nickel/Photocatalytic (Thio)etherification Using Carbon Nitrides
作者:Cristian Cavedon、Amiera Madani、Peter H. Seeberger、Bartholomäus Pieber
DOI:10.1021/acs.orglett.9b01957
日期:2019.7.5
nitride material can be combined with homogeneous nickel catalysts for light-mediated cross-couplings of aryl bromides with alcohols under mild conditions. The metal-free heterogeneous semiconductor is fully recyclable and couples a broad range of electron-poor aryl bromides with primary and secondaryalcohols as well as water. The application for intramolecular reactions and the synthesis of active pharmaceutical