作者:Christopher I. Maxwell、Kalpa Shah、Pavel V. Samuleev、Alexei A. Neverov、R. Stan Brown
DOI:10.1039/b805236k
日期:——
2-diaminocyclohexane (MePyr-chxn, 4); and c) 2,6-pyridyldicarboxaldehyde and (1R),(2R)-trans-1,2-diaminocyclohexane ((Pyr-R,R'-chxn)(2), 5) have been screened for their utility to promote kinetic resolution via metal catalyzed alcoholyses of the p-nitrophenyl esters of chiral D- and L-Boc-protected glutamine and phenylalanine. Solvents were varied to optimize the kinetic selectivity values, defined as
席夫碱加合物的一些手性镧系配合物:a)双(2-吡啶基甲醛)和(1R),(2R)-反式-1,2-二氨基环己烷(Pyr-R,R'-chxn:3);b)6-甲基-2-吡啶基甲醛和(1R),(2R)-反式1,2-二氨基环己烷(MePyr-chxn,4); c)已经筛选了2,6-吡啶基二甲醛和(1R),(2R)-反式-1,2-二氨基环己烷((Pyr-R,R'-chxn)(2),5)的效用以促进动力学通过金属催化的手性D-和L-Boc保护的谷氨酰胺和苯丙氨酸的对硝基苯基酯的拆分。改变溶剂以优化动力学选择性值,定义为k(2)(L)/ k(2)(D)或k(2)(D)/ k(2)(L),用于甲醇分解和某些反应情况下,这些底物的乙醇解作用。在环境温度下,发现由3:Yb(3+)催化的Boc-Gln-OPNP的乙醇化选择性最高:((-)OEt)(k(2)(L)/ k(2)(D)= 7.2)。对于Boc-Phe-OPNP的最大选择性是k(2)(D)/