Palladium-Catalyzed C(sp<sup>3</sup>
)−H Arylation of Primary Amines Using a Catalytic Alkyl Acetal to Form a Transient Directing Group
作者:Sahra St John-Campbell、Alex K. Ou、James A. Bull
DOI:10.1002/chem.201804515
日期:2018.12.3
requires derivatization at nitrogen with a directinggroup. Transientdirectinggroups (TDGs) permit C−H functionalization in a single operation, without needing these additional steps for directinggroup installation and removal. Here we report a palladium catalyzed γ‐C−H arylation of amines using catalytic amounts of alkyl acetals as transientactivators (e.g. commercially available (2,2‐dimethoxyethoxy)benzene)
to plasmalemmal β2-adrenoceptors causing cAMP accumulation are widely used as bronchodilators in chronic respiratory diseases. Here, we designed and synthesized a group of 8-hydroxyquinolin-2(1H)-oneanalogues and studied their β2-agonistic activities with a cellular cAMP assay. Compounds B05 and C08 were identified as potent (EC50 < 20 pM) and selective β2-agonists among the compounds tested. They