Chiral ligand derived from (1S,2R)-norephedrine as a catalyst for enantioselective prochiral ketone reduction
作者:Umesh Balakrishnan、Nallamuthu Ananthi、Sivan Velmathi
DOI:10.1016/j.tetasy.2009.03.029
日期:2009.6
Chiral oxazaborolidines derived from (1S,2R)-(+)-norephedrine and substituted salicylaldehydes were employed in the asymmetric reduction of prochiral ketones using borane dimethyl sulfide as a reducing agent. The secondary alcohols were formed in excellent yields (45–99.8%) with enantioselectivities up to 99.8%. The effect of the substitution in the aromatic ring of the ligand was discussed with the
衍生自(1 S,2 R)-(+)-去氧麻黄碱和取代的水杨醛的手性恶氮杂硼烷在使用硼烷二甲基硫醚作为还原剂的前手性酮的不对称还原中使用。形成的仲醇产率极高(45-99.8%),对映选择性高达99.8%。与产物的对映选择性一起讨论了在配体的芳环中的取代作用。