Enantioselective reductions of aromatic ketones with ammonia–borane complexes of chiral tetraphenyl-18-crown-6 derivatives
作者:Billy L. Allwood、Hooshang Shahriari-Zavareh、J. Fraser Stoddart、David J. Williams
DOI:10.1039/c39840001461
日期:——
Enantioselective reductions of prochiral aromatic ketones with adducts formed between ammonia-borane and (2R,3R,11R,12R)- and (2S,3S,11S,12S)-tetraphenyl-1,4,7,10,13,16-hexaoxacyclo-octadecane, (RRRR)-(3) and (SSSS)-(3), have afforded the corresponding (S) and (R) aromatic secondary alcohols with enantiomeric excesses of 20–67%.
氨硼烷与(2 R,3 R,11 R,12 R)-和(2 S,3 S,11 S,12 S)-四苯基-1,4,7之间形成的加合物对手性芳族酮的对映选择性还原,10,13,16-六氧杂环丁烷(RRRR)-(3)和(SSSS)-(3)提供了相应的(S)和(R)芳香族仲醇,对映体过量为20-67%。