「不斉転写ラジカル転位环化カスケードを用いるアザスピロ环构筑」アザスピロ环の构筑はスピロ中心の立体制御が键であり,従来はあらかじめ不斉中心を构筑する方法が主流であった。最近が见出したsp ラジカル种の素早い立体反転に基づくくく転写型ラジカル転位环化反応では不斉合成が不要のあタタマロものあめかものエる短工程化が可能が。 「迁移触媒の动的制御に基たワポッ多成分链接反応非」をもとに,方法论としての一般性を确立する。すなわち,现在までに见出している,配位子によるチオールエステルおよびケトンの选択的合成について,実用可能なレベルまで反応条件を最适化する。 C の短工程合成へ展开する。
To explore further the practical uses of highly active manganese (Mn*), a variety of alcohols were treated with Mn*, and the resulting complexes were coupled with acid chlorides and/or acetic anhydride in the absence of any extra catalyst. The subsequent reactions took place smoothly under mild conditions, providing the corresponding O-acylation products in good to excellent isolated yields.
Catalyst-free direct decarboxylative coupling of α-keto acids with thiols: a facile access to thioesters
作者:Kelu Yan、Daoshan Yang、Wei Wei、Jing Zhao、Yuanyuan Shuai、Laijin Tian、Hua Wang
DOI:10.1039/c5ob00769k
日期:——
A novel, efficient, and catalyst-free strategy has been initially developed for the construction of thioesters via the direct radical oxidative decarboxylation of α-ketoacids with thiols, and the corresponding target products were obtained in moderate to good yields. It offers an alternative approach for the synthesis of useful diverse thioesters.
Copper-catalyzed decarboxylative coupling between α-oxocarboxylic acids and diphenyl disulfides or thiophenols is presented, which provided an effective and direct approach for the preparation of useful thioesters through C(sp2)–S bond formation.
Herein, a practical and effective synthesis of thioesters from readily available carboxylic acids and odorless disulfides was developed under photocatalytic conditions. This approach involves phosphoranyl radical-mediated fragmentation to generate acyl radicals and allows for incorporation of both S atoms of the disulfides into the desired products. In addition to batch reactions, a continuous-flow