Totally Selective Reaction of CO<sub>2</sub> with Enantiopure Amino Epoxides under Mild Reaction Conditions. Synthesis and Synthetic Applications of Enantiopure (4<i>R,</i>1‘<i>S</i>)- or (4<i>S</i>,1‘<i>S</i>)-4-(1-Aminoalkyl)-2-oxo-1,3-dioxolanes
作者:José M. Concellón、Virginia del Solar、Santiago García-Granda、M. Rosario Díaz
DOI:10.1021/jo070829x
日期:2007.9.1
The reaction of chiral (2R,1‘S)- or (2S,1‘S)-2-(1-aminoalkyl)epoxides 1 or 2 with CO2, generated from acidic treatment of an aqueous solution of NaHCO3 at room temperature, efficiently afforded enantiopure cyclic carbonates 3 or 4, respectively, with total selectivity. Compounds 3 and 4 were readily transformed into the corresponding diols 7 and 8 by reaction with LiAlH4 or by basic hydrolysis. When
NaHCO 3水溶液在20℃下进行酸性处理后生成的手性(2 R,1 'S)-或(2 S,1 'S)-2-(1-氨基烷基)环氧化物1或2与CO 2的反应。在室温下,分别以总选择性有效地得到对映纯的环状碳酸酯3或4。通过与LiAlH 4反应或通过碱性水解,化合物3和4易于转化为相应的二醇7和8。当化合物3或使4与-锂在-78℃下反应,以总选择性或高选择性获得O 1-乙酰基链烷-1,2-二醇9和10。