Strategy for Overcoming Full Reversibility of Intermolecular Radical Addition to Aldehydes: Tandem C–H and C–O Bonds Cleaving Cyclization of (Phenoxymethyl)arenes with Carbonyls to Benzofurans
作者:Hong-Xing Zheng、Xiang-Huan Shan、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.orglett.8b01207
日期:2018.6.1
An intermolecular addition of carbon radicals enabled by a cascade radical coupling strategy is developed. It includes an intermolecular alkyl radical addition to a carbonyl group followed by an intramolecular alkoxy radical addition to haloarenes and produces substituted benzofurans in high yields. The radical nature of this reaction is explored by radical trapping experiments and EPR analysis. The
The use of nitrones in the synthesis of anatoxin-a, very fast death factor
作者:Joseph J. Tufariello、Harold Meckler、K.Pushpananda A. Senaratne
DOI:10.1016/s0040-4020(01)96699-2
日期:1985.1
The synthesis of anatoxin-a (1) was completed by using the cycloaddition of 1-pyrroline 1-oxide (2) onto dienol (6), a reaction which proceeded with high stereoselectivity, regioselectivity, and site selectivity. The resultant adduct (i.e. 7) was oxidized to a second nitrone (i.e. 8) which undergoes a second closure to afford cycloadduct 9a with regiospecificity. The conversion of 9a into anatoxin-a
Tuning the Basicity of Cyano-Containing Ionic Liquids to Improve SO<sub>2</sub>Capture through Cyano-Sulfur Interactions
作者:Guokai Cui、Fengtao Zhang、Xiuyuan Zhou、Haoran Li、Jianji Wang、Congmin Wang
DOI:10.1002/chem.201405683
日期:2015.3.27
A new approach has been developed to improve SO2 sorption by cyano‐containingionicliquids (ILs) through tuning the basicity of ILs and cyano–sulfur interaction. Several kinds of cyano‐containing ILs with different basicity were designed, prepared, and used for SO2 capture. The interaction between these cyano‐containing ILs and SO2 was investigated by FTIR and NMR methods. Spectroscopic investigations
fumarate (5), prepared by condensation of 1-hydroxypyrrole (1a) with trans-3-(methoxycarbonyl)-acryloyl chloride (4), undergoes a facile interamolecular Diels–Alder reaction to give the product (6), the first intramolecular cycloaddition of a pyrrole.