Synthesis of 2,2′-Diaminobischromones Using a Modified Procedure for the Rearrangement of 5-(2-Hydroxyphenyl)isoxazole to 2-Aminochromone
作者:Chandrakanta Bandyopadhyay、Tarun Ghosh、Satyajit Saha
DOI:10.1055/s-2005-869965
日期:——
A modified procedure for the rearrangement of 5-(2-hydroxyphenyl)isoxazoles 6a-e to 2-aminochromones 8a-e was developed and this procedure was utilised in the synthesis of hitherto unreported bischromones 3a-c. The isoxazoles 6a-e were prepared regioselectively from aminovinylketones 5.
A Facile and General Approach to 3-((Trifluoromethyl)thio)-4<i>H</i>-chromen-4-one
作者:Haoyue Xiang、Chunhao Yang
DOI:10.1021/ol502751k
日期:2014.11.7
A facile and efficient synthetic strategy to 3-((trifluoromethyl)thio)-4H-chromen-4-one was developed. AgSCF3 and trichloroisocyanuric acid were employed here to generate active electrophilic trifluoromethylthio species in situ. This reaction could proceed under mild conditions in a short reaction time and be insensitive to air and moisture.
开发了一种简便有效的合成3-((三氟甲基)硫代)-4 H -chromen-4-one的策略。这里使用AgSCF 3和三氯异氰尿酸原位产生活性的亲电子三氟甲硫基物质。该反应可在温和的条件下在短的反应时间内进行,并且对空气和湿气不敏感。
Visible-Light-Driven, Radical-Triggered Tandem Cyclization of <i>o</i>-Hydroxyaryl Enaminones: Facile Access to 3-CF<sub>2</sub> /CF<sub>3</sub>-Containing Chromones
作者:Haoyue Xiang、Qinglan Zhao、Zhenyu Tang、Junan Xiao、Pengju Xia、Chaoming Wang、Chunhao Yang、Xiaoqing Chen、Hua Yang
DOI:10.1021/acs.orglett.6b03441
日期:2017.1.6
A practical and straightforward synthetic route to construct a variety of 3-CF2/CF3-containing chromones via photoredoxcatalysis was developed. This novel protocol features a visible-light-induced radical-triggered tandem cyclization.
One-Pot Synthesis of B-Ring <i>Ortho</i>-Hydroxylated Sappanin-Type Homoisoflavonoids
作者:Galyna P. Mrug、Nataliia V. Myshko、Svitlana P. Bondarenko、Vitaliy M. Sviripa、Mykhaylo S. Frasinyuk
DOI:10.1021/acs.joc.9b00814
日期:2019.6.7
A reliable method for the synthesis of B-ring hydroxylated homoisoflavonoids and 3-hetarylmethyl chromones has been developed. The method involves an initial oxa-Diels–Alder reaction of ortho-quinone methides generated from aryl/hetaryl-substituted ortho-(N,N-dimethylaminomethyl)phenols with (2E)-3-(N,N-dimethylamino)-1-(2-hydroxyphenyl)prop-2-en-1-ones and the subsequent cascade of reactions. This
Visible Light-Induced Thiocyanation of Enaminone C–H Bond to Access Polyfunctionalized Alkenes and Thiocyano Chromones
作者:Yong Gao、Yunyun Liu、Jie-Ping Wan
DOI:10.1021/acs.joc.8b02981
日期:2019.2.15
The visiblelightinducedC–H bond thiocyanation on the α-site of tertiary enaminones has been realized under metal-free, photocatalytic conditions in the presence of Rose Bengal, which enables the synthesis of thiocyanated alkene derivatives and chromones using NH4SCN as the thiocyano source under an aerobic atmosphere. In addition, employing Ru(bpy)3Cl2·6H2O as the photocatalyst switches the reaction