Greening the Valsartan Synthesis: Scale-up of Key Suzuki–Miyaura Coupling over SiliaCat DPP-Pd
摘要:
The study of the scale-up of the heterogeneous Suzuki-Miyaura coupling reaction in batch conditions between 2-chlorobenzonitrile and 4-tolylboronic acid, a key step in valsartan synthesis, to produce 4'-methyl-2-biphenylcarbonitrile over the SiliaCat DPP-Pd catalyst in ethanol under reflux allows to identify the optimal reaction conditions. The catalyst, regardless of limited Pd leaching, is not reusable, and the method can be effectively applied to the high yield synthesis of several coupling products, opening the route to efficient continuous coupling syntheses.
We investigate the heterogeneously catalyzed direct synthesis of boronic acid pinacol esters using a wide range of aryl chlorides, bromides, and iodides, and bis(pinacolato)diboron as the borylating agent over the sol–gel entrapped SiliaCat diphenylphosphine palladium(II) catalyst. Optimization of the reaction conditions, scale‐up of the optimized process, and analysis of palladium leaching enabled
[EN] PROCESS FOR PREPARING VALSARTAN<br/>[FR] PROCEDE DE PREPARATION DE VALSARTAN
申请人:TEVA PHARMA
公开号:WO2007005967A2
公开(公告)日:2007-01-11
[EN] Provided is a process for preparing valsartan and precursors thereof. [FR] L'invention concerne un procédé de préparation de valsartan et de précurseurs de valsartan.