Synthesis of γ,δ,-unsaturated α-amino acids from allylsilanes and glycidyl cation equivalents
作者:Hendrik H. Mooiweer、Henk Hiemstra、W.Nico Speckamp
DOI:10.1016/s0040-4020(01)89098-0
日期:——
The synthesis of a series of γ,δ-unsaturated N-protected α-amino acid methyl esters from the coupling of different allylsilanes and glycidyl cation equivalents 6 and 7 is described. Reactions with methoxyglycine derivative 6 are induced with BF3·OEt2; in the case of chloroglycine derivative 7 SnCl4 is used as Lewis acid. Reactions are fully regioselective, but show low stereoselectivity. The conversion
描述了由不同的烯丙基硅烷和缩水甘油基阳离子当量6和7的偶联合成一系列的γ,δ-不饱和的N-保护的α-氨基酸甲基酯。BF 3 ·OEt 2诱导与甲氧基甘氨酸衍生物6的反应。在氯甘氨酸衍生物7的情况下,将SnCl 4用作路易斯酸。反应是完全区域选择性的,但显示出低的立体选择性。在两种情况下描述了反应产物向未保护的α-氨基酸的转化。