Development of a Continuous-Flow Sonogashira Cross-Coupling Protocol using Propyne Gas under Process Intensified Conditions
摘要:
The development of a continuous-flow Sonogashira cross-coupling protocol using propyne gas for the synthesis of a key intermediate in the manufacturing of a beta-amyloid precursor protein cleaving enzyme 1 (BACE1) inhibitor, currently undergoing late stage clinical trials for a disease-modifying therapy of Alzheimer's disease, is described. Instead of the currently used batch manufacturing process for this intermediate that utilizes TMS-propyne as reagent, we herein demonstrate the safe utilization of propyne gas, as a cheaper and more atom efficient reagent, using an intensified continuous-flow protocol under homogeneous conditions. The flow process afforded the target intermediate with a desired product selectivity of similar to 91% (vs the bis adduct) after a residence time of 10 min at 160 degrees C. The continuous-flow process compares favorably with the batch process, which uses TMS-propyne and requires overnight processing, TBAF as an additive, and a significantly higher loading of Cu co catalyst.
Compounds of the formula (I), in which M is a central building block selected from the group below in which Al, A2, K1 and K2 are as defined in the description, are novel effective tryptase inhibitors.
[EN] TRYPTASE INHIBITORS<br/>[FR] INHIBITEURS DE TRYPTASE
申请人:BYK GULDEN LOMBERG CHEM FAB
公开号:WO2002066430A1
公开(公告)日:2002-08-29
Compounds of the formula (I), in which M is a central building block selected from the group below in which A1, A2, K1 and K2 are as defined in the description, are novel effective tryptase inhibitors.
Highly Active Multidentate Ligand‐Based Alkyne Metathesis Catalysts
作者:Ya Du、Haishen Yang、Chengpu Zhu、Michael Ortiz、Kenji D. Okochi、Richard Shoemaker、Yinghua Jin、Wei Zhang
DOI:10.1002/chem.201505174
日期:2016.6
Alkynemetathesiscatalysts composed of molybdenum(VI) propylidyne and multidentate tris(2‐hydroxylbenzyl)methane ligands have been developed, which exhibit excellent stability (remains active in solution for months at room temperature), high activity, and broad functional‐group tolerance. The homodimerization and cyclooligomerization of monopropynyl or dipropynyl substrates, including challenging