Efficient Synthesis of (Z)-Aurones by the Thallium(I) acetate-Catalyzed 5-exo Cyclization of o-(Alkynon-1-yl)phenols
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Lee, Jae In,Kim, Han Nah
p. 751 - 753
(2019/07/03)
Novel Synthesis of Aurones by 2-PyONa-catalyzed Regioselective Cyclization of o-(Alkynon-1-yl)phenols
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Lee, Jae In
p. 679 - 682
(2018/04/05)
Synthesis of γ-benzopyranone by TfOH-promoted regioselective cyclization of o-alkynoylphenols
Regioselective cyclization of o-alkynoylphenols forming γ-benzopyranones has been demonstrated. Trifluoromethanesulfonic acid (TfOH) induced 6-endo cyclization of o-alkynoylphenols without forming 5-exo cyclized benzofuranone derivatives to provide the corresponding γ-benzopyranones in high yields.
Yoshida, Masahito,Fujino, Yuta,Doi, Takayuki
p. 4526 - 4529
(2011/10/09)
Regioselective synthesis of flavone derivatives via DMAP-catalyzed cyclization of o-alkynoylphenols
A catalytic amount of DMAP promoted cyclization of o-alkynoylphenols via a 6-endo cyclization mode leading to flavone derivatives in high yields without forming 5-exo cyclized aurone derivatives. Utilizing this method, methoxy substituted flavone and alkyl substituted γ-benzopyranone derivatives were synthesized.