Synthesis of Novel Enantiomerically Pure<i>C</i>
<sub>3</sub>-Symmetric Trialkanolamine Ligand Containing Phosphoryl Groups
作者:Andrzej E. Wróblewski、Anetta Hałajewska-Wosik
DOI:10.1055/s-2006-926349
日期:——
Catalytic activity of ten metal salts in the reaction of benzhydrylamine and benzylamine with diethyl 2,3-epoxypropylphosphonate (1) was studied. Only in the presence of copper(I) iodide pure diethyl 3-benzhydrylamino- and 3-benzylamino-2-hydroxypropylphosphonates were produced quantitatively. Although the reactions catalysed by calcium(II) triflate were the fastest, they led to the contamination of the major products with the respective bisphosphonates. Enantiomerically pure (S,S)-bis[2-(O,O-diethylphosphorylmethyl)ethanol]amine (10) was prepared in a Ca(OTf)2-catalysed reaction of (S)-1 (ee 94%) with 0.4 equivalent benzylamine followed by hydrogenolysis. The bisphosphonate (S,S)-10 was transformed into enantiomerically pure (S,S,S)-tris[2-(O,O-diethylphosphorylmethyl)ethanol]amine (2), when reacted with (S)-1 (ee 94%) or into (R,S,S)-2, when (R)-1 (ee 94%) was used.
研究了十种金属盐在苯海拉明和苄胺与 2,3-环氧丙基膦酸二乙酯(1)反应中的催化活性。只有在碘化铜(I)存在的情况下,才能定量生成纯净的 3-苄基氨基和 3-苄基氨基-2-羟基丙基膦酸二乙酯。虽然三酸钙(II)催化的反应速度最快,但它们会导致主要产物受到相应双膦酸盐的污染。(S,S)-双[2-(O,O-二乙基磷酰甲基)乙醇]胺(10)是在 Ca(OTf)2 催化下,由(S)-1(ee 94%)与 0.4 等量的苄胺反应,然后加氢分解制备的对映体纯品。当与(S)-1(ee 94%)反应时,双膦酸盐(S,S)-10 转化为对映体纯的(S,S,S)-三[2-(O,O-二乙基磷酰甲基)乙醇]胺(2);当使用(R)-1(ee 94%)时,则转化为(R,S,S)-2。