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.
Indirect Cation-Flow Method: Flash Generation of Alkoxycarbenium Ions and Studies on the Stability of Glycosyl Cations
作者:Kodai Saito、Koji Ueoka、Kouichi Matsumoto、Seiji Suga、Toshiki Nokami、Jun-ichi Yoshida
DOI:10.1002/anie.201100854
日期:2011.5.23
Go with the flow: The indirect cation‐flow method based on the generation of highly reactive organic cations from their precursors using electrochemically generated [ArS(ArSSAr)]+ was developed in flow microreactor systems (see scheme; Bn=benzyl, M=micromixer, R=microtube reactor). The method was applied to evaluate glycosyl cations such as A or their equivalents and glycosylation reactions.
<scp>l</scp>-Proline-Catalyzed One-Pot Three-Component Reaction for the Synthesis of β-Alkoxy Ketones
作者:Cong-Gui Zhao、Rajasekhar Dodda
DOI:10.1055/s-2006-950184
日期:——
reaction of aliphaticaldehydes, ketones, and alcohols catalyzed by L-proline. Stericeffects on the reaction were studied with substituted ketones, aldehydes, and alcohols, and the results indicate that reactions employing methyl ketones, α-unsubstituted aliphaticaldehydes and methanol produce the β-alkoxy ketones in the best yields when L-proline is used as the catalyst. The reaction mechanism is discussed