10.1021/ol2016934.s001
Masahito Yoshida
Masahito
Yoshida
Yuta Fujino
Yuta
Fujino
Takayuki Doi
Takayuki
Doi
Synthesis of γ-Benzopyranone by TfOH-Promoted Regioselective Cyclization of <i>o</i>-Alkynoylphenols
American Chemical Society
2011
Regioselective
cyclized
Cyclization
TfOH
Benzopyranone
benzofuranone
cyclization
benzopyranone
derivative
Synthesi
endo
exo
yield
Trifluoromethanesulfonic acid
2011-09-02 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Synthesis_of_Benzopyranone_by_TfOH_Promoted_Regioselective_Cyclization_of_i_o_i_Alkynoylphenols/2618263
Regioselective cyclization of <i>o</i>-alkynoylphenols forming γ-benzopyranones has been demonstrated. Trifluoromethanesulfonic acid (TfOH) induced 6-<i>endo</i> cyclization of <i>o</i>-alkynoylphenols without forming 5-<i>exo</i> cyclized benzofuranone derivatives to provide the corresponding γ-benzopyranones in high yields.