Cobalt salt-catalyzed carbocyclization reactions of α-bromo-N-phenylacetamide derivatives
Yi-Chen Cheng1, Ying-Yu Chen1, Che-Ping Chuang1
1Department of Chemistry, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China. cpchuang@mail.ncku.edu.tw.
Abstract:
An efficient and low-cost method for the synthesis of 4-substituted quinolin-2-(1H)-ones has been developed. In the presence of TBHP, the cobalt(ii)-catalyzed carbocyclization reactions of arylethenyl substituted α-bromo-N-phenylacetamides, involving sequential 6-exo-trig radical cyclization, t-butylperoxy radical cross-coupling reaction and the base-promoted ionic Kornblum-DeLaMare reaction, produced 4-benzoylquinolin-2-(1H)-ones. A variety of useful functional groups such as methoxy, fluoro, chloro, bromo, methoxycarbonyl, and cyano groups, are compatible with the reaction conditions. This strategy was further applied to arylethynyl substituted α-bromo-N-phenylacetamides, and 4-benzylquinolin-2-(1H)-ones were formed effectively.
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