An enantioselective Michael addition of diphenyl phosphonate to nitroalkenes has been developed by using a secondary amine bisthiourea catalyst to access enantiomerically enriched β-nitro phosphonates. In this reaction, molecular sieves play a key role in achieving high and reproducible yields with a high enantioselectivities of up to 99% at –10 °C. A probable mechanism for the enantioselective Michael
通过使用仲胺双硫脲催化剂获得对映体富集的 β-硝基膦酸酯,已开发出二苯基膦酸酯与硝基烯烃的对映选择性迈克尔加成。在该反应中,分子筛在 –10 °C 下以高达 99% 的高对映选择性实现高产率和重现性方面发挥着关键作用。通过核磁共振光谱研究建立了对映选择性迈克尔加成反应的可能机制。