Carbonylative enantioselective meso-desymmetrization of cis-epoxides to trans-β-lactones: effect of salen-ligand electronic variation on enantioselectivity
作者:Michael Mulzer、Jessica R. Lamb、Zachary Nelson、Geoffrey W. Coates
DOI:10.1039/c4cc04397a
日期:——
Carbonylation catalysts for the desymmetrization of meso-epoxides yielding enantioenriched trans-β-lactones are reported. Fine-tuning the electronic properties of the ligand further improved enantioselectivity. The sterics of the substrate dictated whether a given electronic variation decreased or increased enantioenrichment, revealing an unexpected relationship between the substrate's steric environment and the electronic nature of the optimal catalyst.
报道了用于降低小分子环氧化物对称性的碳基化催化剂,能够产生富含对映体的反式β-内酯。通过微调配体的电子特性进一步提高了对映选择性。底物的立体结构决定了特定的电子变化是减少还是增加对映富集,揭示了底物的立体环境与最佳催化剂的电子特性之间存在意想不到的关系。