Regioselective synthesis of flavone derivatives via DMAP-catalyzed cyclization of o-alkynoylphenols
作者:Masahito Yoshida、Yuta Fujino、Koya Saito、Takayuki Doi
DOI:10.1016/j.tet.2011.09.063
日期:2011.12
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 cyclizedauronederivatives. Utilizing this method, methoxy substituted flavone and alkyl substituted γ-benzopyranone derivatives were synthesized.
One Pot Synthesis of γ-Benzopyranones via Iron-Catalyzed Aerobic Oxidation and Subsequent 4-Dimethylaminopyridine Catalyzed 6-<i>endo</i>
Cyclization
作者:Di Zhai、Lingzhu Chen、Minqiang Jia、Shengming Ma
DOI:10.1002/adsc.201700993
日期:2018.1.4
One-potsynthesis of γ-benzopyranones was realized in decent yields and excellent regioselectivities via iron-catalyzed aerobic oxidation and 4-dimethylaminopyridine-catalyzed cyclization of related propargylic alcohols. Derivatizations to aromatic substituted γ-benzopyranones and synthesis of naturally occurring 3′,4′-dimethoxyflavone have also been realized.
A concise synthesis of 3-aroylflavones via Lewis base 9-azajulolidine-catalyzed tandem acyl transfer–cyclization
作者:Masahito Yoshida、Koya Saito、Yuta Fujino、Takayuki Doi
DOI:10.1039/c2cc37015h
日期:——
Lewis base-catalyzed tandem acyl transfer-cyclization of acylated o-alkynoylphenols leading to 3-aroylflavones was developed. 9-Azajulolidine smoothly promoted the reaction of the aroyl derivatives at ambient temperature, and the structure-diversed synthesis of 3-aroylflavones with distinct substituents was achieved in moderate to excellent yields.
Synthesis of highly functionalized flavones and chromones using cycloacylation reactions and C-3 functionalization. A total synthesis of hormothamnione
作者:Lynda W. McGarry、Michael R. Detty
DOI:10.1021/jo00301a027
日期:1990.7
Synthesis of γ-Benzopyranone by TfOH-Promoted Regioselective Cyclization of <i>o</i>-Alkynoylphenols
作者:Masahito Yoshida、Yuta Fujino、Takayuki Doi
DOI:10.1021/ol2016934
日期:2011.9.2
Regioselective cyclization of o-alkynoylphenols forming gamma-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 gamma-benzopyranones in high yields.