Multigram Synthesis of Chiral Cyclopropane Carboxylic Acids via Tandem Diastereoselective Wadsworth–Emmons Cyclopropanation-Hydrolysis in Continuous Flow
作者:Carlos Mateos、Susana García-Cerrada、Pablo García-Losada、Oscar de Frutos
DOI:10.1021/acs.oprd.3c00444
日期:——
Here, we present a novel continuous flow approach for the Wadsworth–Emmons cyclopropanation of alkyl-substituted chiral epoxides into chiral cyclopropane carboxylic acids. The developed flow process circumvents the risks associated with the harsh conditions (high T/P) required, considering the highly volatile nature of the epoxide-SM. Additionally, the flow reactors offer increased efficiency, as their
在这里,我们提出了一种新颖的连续流方法,用于将烷基取代的手性环氧化物沃兹沃斯-埃蒙斯环丙烷化成手性环丙烷羧酸。考虑到环氧化物-SM 的高挥发性,所开发的流程规避了与所需的恶劣条件(高T / P )相关的风险。此外,流动反应器提供了更高的效率,因为其减少的顶部空间有助于在液相中保持较高浓度的低沸点反应物,从而增强反应性,这与批量使用密封容器相反。环丙烷形成过程与在线后处理和水解转化相结合,以高达 100 g 规模的良好产率产生所需的对映体纯环丙烷羧酸。