通过使用铱/f-Ampha 配合物作为催化剂,开发了一种通用且高效的 α,β-不饱和酮的不对称顺序氢化方法,以高收率提供具有两个连续立体中心的相应手性醇,并具有优异的非对映和对映选择性(高达 99% 的产率,>20 : 1 dr 和 >99% ee)。对照实验表明,烯酮的 C C 和 C O 键依次氢化,最终的立体选择性由酮的动态动力学拆分决定。此外,DFT 计算表明,外球途径参与了 C C 和 C的减少。O 烯酮键。该方法的合成效用通过克级反应和极低催化剂负载量 (S/C = 20 000) 和获得抗哮喘药物 CP-199,330 的关键手性中间体的简明合成路线得到证明。
Asymmetric Hydrogenation of Ketones and Enones with Chiral Lewis Base Derived Frustrated Lewis Pairs
作者:Bochao Gao、Xiangqing Feng、Wei Meng、Haifeng Du
DOI:10.1002/anie.201914568
日期:2020.3.9
The concept of frustratedLewispairs (FLPs) has been widely applied in various research areas, and metal-free hydrogenation undoubtedly belongs to the most significant and successful ones. In the past decade, great efforts have been devoted to the synthesis of chiral boron Lewis acids. In a sharp contrast, chiral Lewisbase derived FLPs have rarely been disclosed for the asymmetric hydrogenation.
Novel Synthesis of Isoflavones by the Palladium-Catalyzed Cross-Coupling Reaction of 3-Bromochromones with Arylboronic Acids or Its Esters
作者:Yukio Hoshino、Norio Miyaura、Akira Suzuki
DOI:10.1246/bcsj.61.3008
日期:1988.8
The synthesis of isoflavone derivatives by means of palladium-catalyzed cross-couplingreaction between 3-bromochromones and arylboronic acids or its butyl esters is described.
描述了通过钯催化的 3-溴色酮与芳基硼酸或其丁酯之间的交叉偶联反应合成异黄酮衍生物。
Ruthenium(II)-Catalyzed C–H Activation of Chromones with Maleimides to Synthesize Succinimide/Maleimide-Containing Chromones
efficient route for the coupling of maleimides with chromones at the C5-position has been developed under Ru(II) catalysis. It could provide 1,4-addition products and oxidative Heck-type products by switching additives. Benzoic acid led to the formation of 1,4-addition products under solvent-free conditions, and silver acetate was promoted to the generation of oxidative Heck-type products. Various maleimides