赤藓红 B 光催化脱氢 sp 3 C–O 键形成反式二氢-4H-呋喃[3,2-c]chromen-4-ones
摘要:
开发了一种简单有效的可见光诱导方法,用于通过脱氢偶联反应选择性合成 dihydro-4 H -furo[3,2- c ]chromen-4-one 衍生物。该方法对于在氧气气氛下从容易获得的反应物合成各种二氢-4 H-呋喃[3,2- c ]chromen-4-ones 非常有用。重要的是,这种转变也证明了无添加剂的方法。机理研究的结果表明,这种脱氢反应是通过自由基途径进行的。此外,合成的 dihydro-4 H -furo[3,2- c ]chromen-4-one 已转化为不同的 4 H-furo[3,2- c ]chromen-4-ones 通过简单的协议。
赤藓红 B 光催化脱氢 sp 3 C–O 键形成反式二氢-4H-呋喃[3,2-c]chromen-4-ones
摘要:
开发了一种简单有效的可见光诱导方法,用于通过脱氢偶联反应选择性合成 dihydro-4 H -furo[3,2- c ]chromen-4-one 衍生物。该方法对于在氧气气氛下从容易获得的反应物合成各种二氢-4 H-呋喃[3,2- c ]chromen-4-ones 非常有用。重要的是,这种转变也证明了无添加剂的方法。机理研究的结果表明,这种脱氢反应是通过自由基途径进行的。此外,合成的 dihydro-4 H -furo[3,2- c ]chromen-4-one 已转化为不同的 4 H-furo[3,2- c ]chromen-4-ones 通过简单的协议。
A series of 2,3-dihydrofurocoumarins were prepared via a three-component reaction of aldehyde, pyridinium salt and 4-hydroxycoumarin in aqueous ethanol. This method avoids using excessive pyridine and trimethylamine, and has operational simplicity and avoids tedious column chromatography purification. Both aryl aldehydes and aliphatic aldehydes are applicable to this protocol.
For a better understanding the mechanism action of these compounds, we performed the binding studies with calf thymus DNA (CT-DNA). Both molecular docking studies as well as biophysical studies indicate that these compounds may possess DNA binding affinity through intercalation. Through photo cleavage studies, it is evident that they have the potential to cleave pBR322 plasmid DNA strand in a concentration
Betaine mediated synthesis of annulated dihydrofurans from oxobis(methylthio)ketene acetals and N-butyl-N′-methyl ethane-1,2-diamine as precursors via NHC elimination
First in-situ generation of betaine intermediate has been developed using two new precursors oxobis(methylthio)ketene acetals and N-butyl-N'-methyl ethane-1,2-diamine for the synthesis of annulated dihydrofurans. This protocol adds a new dimension...
Aqueous Iodine(III)-Mediated Stereoselective Oxidative Cyclization for the Synthesis of Functionalized Fused Dihydrofuran Derivatives
作者:Yang Ye、Linfei Wang、Renhua Fan
DOI:10.1021/jo902553k
日期:2010.3.5
An efficient aqueous oxidativecyclization mediated by the combination of iodosobenzene with tetra-(n-butyl)ammonium iodide provides a new convenient and useful route to functionalized fused dihydrofuran derivatives in moderate to excellent yields with high diastereoselectivities.
Modified One-Pot Multicomponent Diastereoselective Synthesis of <i>Trans</i>-2,3-Dihydrofuro[3,2-c]coumarins via In Situ–Generated <font>α</font>-Tosyloxyketones
one-pot multicomoponent reaction starting from aromatic aldehydes, 4-hydroxycoumarin, and α-tosyloxyacetophenones with pyridine and triethylamine as catalysts. The developed protocol provides a better alternative to the existing methods as it involves utilization of α-tosyloxyacetophenones that may be generated in situ from acetophenones and [hydroxyl(tosyloxy)iodo]benzene (HTIB, Koser's reagent), avoiding