La(OTf)3-Catalyzed [3+2] Cycloaddition Reactions for the Synthesis of Benzo[d]oxazoles/Benzofurans
Zhanjun Li,
Yalin Zhang,
Manman Sun
et al.
Abstract:The
La(OTf)3-catalyzed [3+2] cycloaddition reactions
for the synthesis of benzo[d]oxazoles/benzofurans
via quinones and 1,2-di-tert-butyl-3-(cyanimino)diaziridine
(1,3-di-tert-butyl-2-cyanoguanidine)/vinyl azides
have been explored. A series of 5-hydroxybenzofuran-4-carboxylic acid
derivatives and 5-hydroxybenzo[d]oxazole-4-carboxylic
acid derivatives were conveniently obtained with high yields and good
stereoselectivities, which could be used for further transformations
to valuable compounds.
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