A new radical cyclization method for the formation of C(sp3)–C(sp3) and C–O bonds via MnO2-promoted alkene carboesterification with anhydrides is developed.
A RuPHOX−Ru catalyzedasymmetrichydrogenation of γ‐keto acids has been developed, affording the corresponding enantiopure γ‐lactones in high yields and with up to 97% ee. The reaction could be performed on a gram scale with a relatively low catalyst loading (up to 10000 S/C) under the indicated reaction conditions and the resulting products can be transformed to several enantiopure building blocks
已开发出RuPHOX-Ru催化的γ-酮酸不对称氢化反应,可提供高收率和高达97%ee的相应对映体纯γ-内酯。该反应可以在指定的反应条件下以相对较低的催化剂负载量(最高10000 S / C)以克为单位进行,所得产物可以转化为几种对映纯结构单元,生物活性化合物和对映纯药物。
Gallium-catalyzed reductive lactonization of γ-keto acids with a hydrosilane
作者:Norio Sakai、Shuhei Horikawa、Yohei Ogiwara
DOI:10.1039/c6ra19286f
日期:——
Described herein is the GaCl3-catalyzed lactonization of γ-keto carboxylic acids in the presence of PhSiH3 leading to the direct preparation of γ-lactone derivatives. This reducing system showed a relatively wide functional group tolerance.
Copper-Catalyzed Intermolecular Oxidative [3 + 2] Cycloaddition between Alkenes and Anhydrides: A New Synthetic Approach to γ-Lactones
作者:Liangbin Huang、Huanfeng Jiang、Chaorong Qi、Xiaohang Liu
DOI:10.1021/ja108073k
日期:2010.12.22
A new copper-catalyzed oxidative [3 + 2] cycloaddition of alkenes with anhydrides using oxygen as the sole oxidant to afford γ-lactones has been developed. This catalyzed cyclization process has a broad substrate scope and affords γ-lactones in good to excellent yields.
Indium-Catalyzed Direct Conversion of Lactones into Thiolactones and Selenolactones in the Presence of Elemental Sulfur and Selenium
作者:Norio Sakai、Shuhei Horikawa、Yohei Ogiwara
DOI:10.1055/s-0036-1591849
日期:2018.2
Abstract The direct conversion of lactones into thiolactones with elemental sulfur (S8) catalyzed by InCl3/PhSiH3 in a one-pot reaction is described. This catalytic system was successfully applied to the novel preparation of selenolactones from lactones and selenium. The direct conversion of lactones into thiolactones with elemental sulfur (S8) catalyzed by InCl3/PhSiH3 in a one-pot reaction is described