Synthesis 2017; 49(06): 1273-1284
DOI: 10.1055/s-0036-1588642
paper
© Georg Thieme Verlag Stuttgart · New York

Copper-Salt-Promoted Carbocyclization Reactions of α-Bromo-N-arylacylamides

Che-Ping Chuang*
Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan   eMail: cpchuang@mail.ncku.edu.tw
,
Ying-Yu Chen
Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan   eMail: cpchuang@mail.ncku.edu.tw
,
Tsung-Han Chuang
Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan   eMail: cpchuang@mail.ncku.edu.tw
,
Cheng-Hao Yang
Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan   eMail: cpchuang@mail.ncku.edu.tw
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Publikationsverlauf

Received: 05. September 2016

Accepted after revision: 11. Oktober 2016

Publikationsdatum:
07. November 2016 (online)


Abstract

A mild and convenient synthetic method for oxindoles and α-arylacylamides bearing an all carbon quaternary stereocenter from the readily available α-bromo-N-arylacylamides has been developed. This Cu(acac)2/Phen-promoted radical cyclization reaction, via the intramolecular radical cyclization onto the aryl moiety, can proceed in two different routes depending on the substituents on the nitrogen atom. In this transformation, oxindoles and α-arylacylamides were formed in high chemoselectivity. A variety of useful functional groups such as methoxy, fluoro, chloro, bromo, methoxycarbonyl, and cyano are compatible with the reaction conditions. The use of inexpensive, readily available Cu(acac)2 and Phen makes this protocol very efficient and practical.

Supporting Information