The first total syntheses of (+)-agelasimine-A and (+)-agelasimine-B, adenine-related bicyclicditerpenoids isolated from the marinespongeAgelasmauritiana, have been achieved via a highly stereoselective route. On the basis of the present results, the absolute configurations of both alkaloids have been defined as shown in stereoformulas (+)-1a and (+)-1b, respectively.
Selective one-pot carvone oxime hydrogenation over titania supported gold catalyst as a novel approach for dihydrocarvone synthesis
作者:Yu. S. Demidova、E.V. Suslov、O.A. Simakova、K.P. Volcho、N.F. Salakhutdinov、I.L. Simakova、D. Yu. Murzin
DOI:10.1016/j.molcata.2016.04.013
日期:2016.8
for the first time that dihydrocarvone can be selectively produced by gold-catalyzed one-pot transformation of carvone oxime. This reaction was carried out at 100 °C under hydrogen pressure of 9 bar over 1.9 wt.% Au/TiO2 catalyst using methanol as a solvent. Dihydrocarvone synthesis was shown to occur via carvone formation with the subsequent hydrogenation of its conjugated CC double bond. Application
摘要 首次表明金催化香芹酮肟一锅转化可选择性制备二氢香芹酮。该反应在 100 °C 和 9 bar 的氢气压力下在 1.9 wt.% Au/TiO2 催化剂上使用甲醇作为溶剂进行。二氢香芹酮的合成显示通过香芹酮的形成以及随后其共轭的CC双键的氢化而发生。首次报道了Au/TiO2催化剂在烯烃CC官能团的脱肟和选择性加氢中的应用。这些步骤的组合优化了从香芹酮肟生产二氢香芹酮的合成方法,香芹酮肟是从柠檬烯合成香芹酮的关键中间体。尽管反应速率比香芹酮低,在香芹酮肟氢化的情况下,观察到对反式二氢香芹酮的立体选择性显着增加。反式和顺式二氢香芹酮的比例接近 4.0,而香芹酮加氢的比例为 1.8。