A systematic study of the effect of substitution within the β-amino acid framework indicates that both β2- and β3-amino acids catalyse the HajosâParrishâEderâSauerâWiechert reaction with poor to reasonable levels of enantioselectivity. These results led to the evaluation of the conformationally constrained β-amino acid (1R,2S)-cispentacin, which catalyses the HajosâParrishâEderâSauerâWiechert reaction with comparable or higher levels of enantioselectivity to L-proline.
对β-
氨基酸框架内取代效应的系统研究表明,β2-和β3-
氨基酸催化Hajos–Parrish–Eder–Sauer–Wiechert反应的对映选择性较低至合理。这些结果促使对构象受限的β-
氨基酸(1R,2S)-cispentacin进行评估,该
氨基酸催化Hajos–Parrish–Eder–Sauer–Wiechert反应的对映选择性与
L-脯氨酸相比相当或更高。