Oxidative Kinetic Resolution of Cyclic Benzylic Ethers
作者:Shutao Sun、Yingang Ma、Ziqiang Liu、Lei Liu
DOI:10.1002/anie.202009594
日期:2021.1.4
manganese‐catalyzed oxidative kinetic resolution of cyclic benzylic ethersthrough asymmetric C(sp3)−H oxidation is reported. The practical approach is applicable to a wide range of 1,3‐dihydroisobenzofurans bearing diverse functional groups and substituent patterns at the α position with extremely efficient enantiodiscrimination. The generality of the strategy was further demonstrated by efficient oxidative kinetic
A new method for the synthesis of Z-enediones via IBX-mediated oxidative rearrangement of 2-alkynyl alcohol systems
作者:Benedikt Crone、Stefan F. Kirsch
DOI:10.1039/b515838a
日期:——
o-Iodoxybenzoic acid (IBX) was found to mediate the conversion of alpha-alkynyl alcohols into Z-enediones under notably mild conditions via a novel rearrangement mechanism (33-65% yield, 13 examples).
Diversity-Oriented Synthesis of 3-Iodochromones and Heteroatom Analogues via ICl-Induced Cyclization
作者:Chengxiang Zhou、Anton V. Dubrovsky、Richard C. Larock
DOI:10.1021/jo0523722
日期:2006.2.1
The ICl-inducedcyclization of heteroatom-substituted alkynones provides a simple, highly efficient approach to various 3-iodochromones and analogues. This process is run under mild conditions, tolerates various functional groups, and generally provides chromones in good to excellent yields. Subsequent palladium-catalyzed transformations afford a rapid increase in molecular complexity and a convenient
An Efficient Synthesis of (
<scp>1‐Methyl</scp>
)‐2‐phenyl‐4‐quinolones from (
<scp>
<i>N</i>
‐Methyl
</scp>
)isatoic Anhydride
作者:Jae In Lee
DOI:10.1002/bkcs.12239
日期:2021.4
substitution of (N‐methyl)isatoic anhydride with N,O‐dimethylhydroxylamine hydrochloride in CH3CN gave N‐methoxy‐N‐methyl 2‐(N‐methyl)aminobenzamide, which was treated with ethynyllithium reagents to afford 1‐[2‐(N‐methyl)amino]‐3‐phenyl‐2‐propyn‐1‐ones. The 6‐endo cyclization of 1‐[2‐(N‐methyl)amino]‐3‐phenyl‐2‐propyn‐1‐ones using NaOCH3 in CH3OH at 65 °C gave various (1‐methyl)‐2‐phenyl‐4‐quinolone
or silver-catalyzed cascade radical addition/dearomative spirocyclization of biaryl ynones with fluoroalkyl bromides or diethylphosphite has been realized for the first time. This method provides a novel and step-economical protocol for the divergent synthesis of a wide range of difluoromethylated or monofluoromethylated and phosphorated spiro[5.5]trienones in moderate to high yields.