Novel valdecoxib derivatives by ruthenium(<scp>ii</scp>)-promoted 1,3-dipolar cycloaddition of nitrile oxides with alkynes – synthesis and COX-2 inhibition activity
作者:Silvia Roscales、Nicole Bechmann、Daniel Holger Weiss、Martin Köckerling、Jens Pietzsch、Torsten Kniess
DOI:10.1039/c7md00575j
日期:——
Novel valdecoxib-based cyclooxygenase-2 inhibitors were synthesized in one step via 1,3-dipolar cycloaddition of nitrile oxides with a series of eleven aryl alkynes, six of them described for the first time. Application of Ru(II)-catalysis leads preferably to the formation of the 3,4-diaryl-substituted isoxazoles, while under thermal heating with base the 3,5-diaryl substitution pattern is favoured
通过将腈与一系列十一个芳基炔烃进行1,3-偶极环加成反应,一步合成了一种新的基于valdecoxib的环氧合酶-2抑制剂,其中六个首次被描述。Ru(II)催化的应用优选导致3,4-二芳基取代的异恶唑的形成,而在与碱一起热加热下,有利于3,5-二芳基取代的模式。具有小的取代基(H和Me)的新的3,4-二芳基取代的异恶唑显示出高的COX-2抑制亲和力(IC 50= 0.042–0.073μM)和优异的选择性(COX-2 SI> 2000)。相反,3,5-二芳基取代的化合物几乎没有表现出COX活性。4-氟苯基取代基的引入导致保留了较高的COX-2亲和力,使这些化合物与可行的一步反应一起有望成为开发氟18标记的放射性示踪剂的候选物。