Palladium-Catalyzed Conjugate Addition to Electron-Deficient Alkynes with Benzenesulfinic Acid Derived from 1,2-Bis(phenylsulfonyl)ethane: Selective Synthesis of (<i>E</i>)-Vinyl Sulfones
作者:Ren-Jie Song、Yu Liu、Yan-Yun Liu、Jin-Heng Li
DOI:10.1021/jo102359n
日期:2011.2.4
A new, selective method for the synthesis of (E)-vinyl sulfones is presence by palladium-catalyzed C−S bond cleavage/conjugate addition. In the presence of Pd(OAc)2 and DMEDA (N1,N2-dimethylethane-1,2-diamine), 1,2-bis(phenylsulfonyl)ethane underwent the C−S bond cleavage, followed by conjugate addition to numerous electron-deficient alkynes afforded the corresponding (E)-vinyl sulfones in moderate
Electrophilic <i>ipso</i>-Iodocyclization of <i>N</i>-(4-Methylphenyl)propiolamides: Selective Synthesis of 8-Methyleneazaspiro[4,5]trienes
作者:Quan-Fu Yu、Yue-Hua Zhang、Qin Yin、Bo-Xiao Tang、Ri-Yuan Tang、Ping Zhong、Jin-Heng Li
DOI:10.1021/jo800328a
日期:2008.5.1
[GRAPHICS]A novel and selective method for the synthesis of 8-methylenespiro[4,5]trienes via intramolecular electrophilic ipsoiodocyclization of N-(4-methylphenyl)propiolamides has been developed. In the presence of ICI or I-2, 8-methylene-1-azaspiro[4,5]trienes were selectively prepared from the electrophilic ipso-iodocyclization of N-(4-methylphenyl)propiolamides in moderate to good yields.