Asymmetric Henry reactions catalyzed by metal complexes of chiral oxazoline based ligands
作者:A. Ebru Aydin、Seda Yuksekdanaci
DOI:10.1016/j.tetasy.2012.11.022
日期:2013.1
Chiral oxazolines have been synthesized from norephedrine and pyrrole nitrile or benzoyl chloride and applied to the catalytic asymmetric Henry reactions of p-nitro aldehydes with nitromethane to provide β-hydroxy nitroalkanols in high conversion (up to 92%). The reaction was then optimized in terms of the metal, solvent, temperature, and amount of chiral ligand. The corresponding catalyst with Cu(OTf)2
由去氧麻黄碱和吡咯腈或苯甲酰氯合成了手性恶唑啉,并将其用于对硝基醛与硝基甲烷的催化不对称亨利反应,以高转化率(高达92%)提供β-羟基硝基链烷醇。然后根据金属,溶剂,温度和手性配体的量优化反应。用Cu(OTf)2和异丙醇作为溶剂的相应催化剂给出了相应的β-硝基链烷醇对对硝基苯甲醛的最佳对映选择性(最高84%ee)。