On the enantioselectivity of aziridination of styrene catalysed by copper triflate and copper-exchanged zeolite Y: consequences of the phase behaviour of enantiomeric mixtures of N-arene-sulfonyl-2-phenylaziridines
作者:Laura Jeffs、Damien Arquier、Benson Kariuki、Donald Bethell、Philip C. Bulman Page、Graham J. Hutchings
DOI:10.1039/c0ob00724b
日期:——
previous reports on the enantioselectivity of copper-catalysed aziridination, both in heterogeneous and homogeneous conditions, should be regarded with caution if the analytical procedure involved HPLC with injection of the enantiomeric mixture in a hexane-rich solvent. Such a method has been used in previous work from this laboratory, but has also been used elsewhere, following the procedure developed
通过合成 S -2-苯基-N-(4-硝基苯基)氮丙啶 从 小号-phenylglycinol,已证明 苯乙烯 经过 [ N-(4-硝基苯磺酰基)亚氨基]苯基碘丁烷 (邻苯二甲酰亚胺基苯基碘丁烷,PhINNs)在存在小号,小号-2,2'-亚异丙基二(4-苯基-2-恶唑啉),催化由铜(II),三氟甲磺酸在CH 3 CN溶液中或通过CuHY异质地存在时,主要具有R构型。对氨基苯甲酸酯化的对映选择性苯乙烯由铜交换沸石Y(CuHY)催化的[ N-芳烃磺酰氨基]-苯基碘烷与手性双-恶唑啉配体一起被重新研究。对于PhINNs,表明对映体氮丙啶的产物混合物在用正己烷产生低对映体过量(ee)的固相和高ee对映体。固相分离和重结晶得到真正的外消旋物(外消旋化合物),这已通过X射线晶体学证实。这氮丙啶从溶液相获得的对映体可以重结晶以产生最初过量的纯对映体。新发现的结果是,如果分析程序涉及在富己烷溶剂中注入对映体