Indirect Cation Pool Method. Rapid Generation of Alkoxycarbenium Ion Pools from Thioacetals
作者:Seiji Suga、Kouichi Matsumoto、Koji Ueoka、Jun-ichi Yoshida
DOI:10.1021/ja0625778
日期:2006.6.1
the electrochemical generation and accumulation of ArS(ArSSAr)+ at low temperature (step 1) and the follow-up reaction with a thioacetal to generate an alkoxycarbeniumion pool (step 2), which reacts with various carbonnucleophiles (step 3). Steps 2 and 3 are extremely fast. The electrogenerated ArS(ArSSAr)+ was well-characterized by 1H NMR and CSI-MS. The alkoxycarbeniumion pool generated by the
s having a carbon-carbon double bond in an appropriate position using Bu(4)NBF(4) as the supporting electrolyte leads to the effective cyclization and the introduction of the fluoride to one of the formal olefinic carbon. The present study demonstrates the effectiveness of organothiogroups as electroauxiliaries in electrooxidativeinter- and intramolecularcarbon-carbonbondformation.
Direct and indirect electrochemical generation of alkoxycarbenium ion pools from thioacetals
作者:Kouichi Matsumoto、Koji Ueoka、Shinkiti Suzuki、Seiji Suga、Jun-ichi Yoshida
DOI:10.1016/j.tet.2009.09.020
日期:2009.12
Thioacetals were found to be effective precursors to generate and accumulate alkoxycarbeniumions based on direct and indirect cation pool methods. Alkoxycarbeniumions thus generated reacted with carbonnucleophiles such as allylsilanes and enol silyl ethers to give C–C bond formation products in good yields.