NMR Separation of β-Prochiral Protons to the Ether Oxygen of Chiral Esters with Lanthanide Shift Reagents
作者:James M. Coxon、James R. A. Cambridge、Shayne G. C. Nam
DOI:10.1021/ol016904m
日期:2001.12.1
The use of chiral ester derivatives of 2-phenylethan-1-ol in conjunction with chiral lanthanide shift reagents allows separation of the prochiral and homo prochiral protons to the ether oxygen in the NMR spectrum. Specifically the alpha- and beta- protons of the N-(4-nitrophenylsulfonyl)-L-phenylalanyl ester of 2-phenylethan-1-ol, after addition of either europium d- or l-3-heptafluorobutyrylcamphorate
将2-苯基乙-1-醇的手性酯衍生物与手性镧系元素转移试剂结合使用可在NMR光谱中将前手性和均手性质子分离为醚氧。具体地,在添加eurod-或l-3-七氟丁酰樟脑或ord-3-之后,2-苯基乙-1-醇的N-(4-硝基苯基磺酰基)-L-苯丙氨酸酯的α-和β-质子区分七氟丁酰樟脑酯。这是前手性质子β与酯键的NMR分离的首次报道。[反应:看文字]