sp3-sp2 C-C Bond Formation via Brønsted Acid Trifluoromethanesulfonic Acid-Catalyzed Direct Coupling Reaction of Alcohols and Alkenes
作者:Hui-Lan Yue、Wei Wei、Ming-Ming Li、Yong-Rong Yang、Jian-Xin Ji
DOI:10.1002/adsc.201100262
日期:2011.11
A novel and efficient trifluoromethanesulfonic acid-catalyzed sp3-sp2 CC bond formation reaction through the direct coupling of alcohols with alkenes has been realized under mild conditions. The present protocol provides an attractive approach to a diverse range of polysubstituted olefins in good to excellent yields with high stereo- and regioselectivities.
Metal-Free and Recyclable Route to Synthesize Polysubstituted Olefins<i>via</i>CC Bond Construction from Direct Dehydrative Coupling of Alcohols or Alkenes with Alcohols Catalyzed by Sulfonic Acid-Functionalized Ionic Liquids
AbstractA direct synthesis of polysubstituted olefins via construction of CC bonds, which involves the direct dehydrative coupling of alcohols or alkenes with alcohols, was realized using a series of alkanesulfonic acid group‐functionalized ionic liquids (SO3H‐functionlization ILs) without additives. The metal‐free and recyclable catalyst system avoided the disposal and neutralization of acidic catalysts after reaction and tolerated a broad range of substrates, including benzylic, allyl, propargylic, aliphatic and aromatic or aliphatic olefins. Additionally, the catalytic system was suitable for a gram‐scale preparation. Preliminary mechanistic studies indicated that the CH bond cleavage in this reaction might be involved in the rate‐determining step.magnified image