Abstract2,5‐Disubstituted oxazoles with a variety of alkyl and aryl groups are efficiently formed from N‐acylamino acids, by a one‐pot radical decarboxylation–oxidation–enolization and iodine‐promoted cyclization process. Remarkably, the reaction takes place under mild conditions, and no metal catalysis is needed. The process can be useful for the direct modification of small peptides.magnified image
Iodine(III)‐Mediated/Catalyzed Cycloisomerization–Amination Sequence of
<i>N</i>
‐Propargyl Carboxamides
作者:Yuki Okamura、Daisuke Sato、Akira Yoshimura、Viktor V. Zhdankin、Akio Saito
DOI:10.1002/adsc.201700587
日期:2017.9.18
(Diacetoxyiodo)benzene or iodine(III) catalyst, in situ generated from iodobenzene precatalyst with Oxone, promotes the cycloisomerization–aminationsequence of N-propargyl carboxamides with bis(sulfonyl)imides under mild conditions, thereby leading to the direct formation of oxazoles bearing nitrogen functional groups.
PIDA-mediated synthesis of oxazoles through oxidative cycloisomerization of propargylamides
作者:Akio Saito、Asami Matsumoto、Yuji Hanzawa
DOI:10.1016/j.tetlet.2010.02.096
日期:2010.4
PIDA [phenyliodine(III) diacetate] in AcOH or AcOH-HFIP (hexafluoroisopropanol) efficiently promotes the formation of 2,5-disubstituted oxazoles via the oxidative cycloisomerization of propargylamide derivatives. (C) 2010 Elsevier Ltd. All rights reserved.