Totally stereocontrolled synthesis of α,β-diamino acids by addition of Grignard reagents to nitrones derived from l -serine
作者:Pedro Merino、Ana Lanaspa、Francisco L Merchan、Tomas Tejero
DOI:10.1016/s0957-4166(98)00004-4
日期:1998.2
The asymmetric synthesis of protected (2R,3S)- and (2R,3R)-3-substituted 2,3-α-amino acids is reported. The key step in the synthesis of these compounds is the diastereoselective addition of Grignard reagents to α-amino nitrones derived from l-serine. Total stereocontrol of the addition step is achieved by changing the protecting groups in the starting material. The predominant selectivity in each
据报道受保护的(2R,3S)-和(2R,3R)-3-取代的2,3-α-氨基酸的不对称合成。合成这些化合物的关键步骤是将格氏试剂非对映选择性地加到衍生自l-丝氨酸的α-氨基硝酮上。通过改变起始原料中的保护基,可以实现对加成步骤的完全立体控制。在每种情况下,主要的选择性可以根据取代基的空间效应来合理地解释。