Organocatalytic Michael Cycloisomerization of Bis(enones): The Intramolecular Rauhut−Currier Reaction
摘要:
The utilization of enones as latent enolates enables regioselective enolate formation from chemically robust presursors. In this communication, we report a catalytic Michael cycloisomerization of bis(enones) under Morita-Baylis-Hillman conditions. Upon exposure to 10 mol % tributylphosphine, bis(enone) substrates afford both five- and six-membered ring products. Notably, unsymmetrical bis(enones) possessing sufficient steric or electronic bias yield single isomeric products.
Diastereoselective Cycloreductions and Cycloadditions Catalyzed by Co(dpm)<sub>2</sub>-Silane (dpm = 2,2,6,6-tetramethylheptane-3,5-dionate): Mechanism and Partitioning of Hydrometallative versus Anion Radical Pathways
作者:Long-Cheng Wang、Hye-Young Jang、Yeonsuk Roh、Vincent Lynch、Arthur J. Schultz、Xiaoping Wang、Michael J. Krische
DOI:10.1021/ja020223k
日期:2002.8.1
stereochemistry and electrochemical studies involving cathodicreduction of bis(enone) substrates. The collective experiments reveal competitive enone reduction pathways. Enone hydrometalation produces metallo-enolates en route to aldol and Michael cycloreduction products, that is, products derived from coupling at the alpha-position of the enone. Electron-transfer-mediated enone reduction produces metallo-oxy-pi-allyls
Organocatalytic Michael Cycloisomerization of Bis(enones): The Intramolecular Rauhut−Currier Reaction
作者:Long-Cheng Wang、Ana Liza Luis、Kyriacos Agapiou、Hye-Young Jang、Michael J. Krische
DOI:10.1021/ja0121686
日期:2002.3.1
The utilization of enones as latent enolates enables regioselective enolate formation from chemically robust presursors. In this communication, we report a catalytic Michael cycloisomerization of bis(enones) under Morita-Baylis-Hillman conditions. Upon exposure to 10 mol % tributylphosphine, bis(enone) substrates afford both five- and six-membered ring products. Notably, unsymmetrical bis(enones) possessing sufficient steric or electronic bias yield single isomeric products.