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.
Base catalysed cyclization of 1-(2′-hydroxy-phenyl)-2-ynones: A new pathway to the chromone skeleton.
作者:Dominique Pflieger、Bernard Muckensturm
DOI:10.1016/0040-4039(90)80211-4
日期:1990.1
2-n-Butyl chromone is synthesized by an efficient new method starting from salicylaidehyde. The key step uses cyclisation of an aromatic hydroxy-ynone. Some sensitive intermediates need to be protected as methyithiomethyl-ethers.
three-component reaction of alkynylaryl ketones bearing an ortho-methoxy group, element selenium, and arylboronic acid, providing a facile route to selenofunctionalized chromone products has been developed. This protocol features high efficiency and high regioselectivity, and the use of selenium powder as the selenium source. Mechanistic experiments indicated that the combined oxidative effect of (bis(tri
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.
Synthesis of Aurones through Silver-catalyzed Intramolecular Cyclization from <i>o</i>
-Alkynonylphenols
作者:Woonsang Hwang、Hyunseok Kim、Hyuck Choi、Jaehyun Kim、Woo Hyung Jeon、Phil Ho Lee、Kooyeon Lee