作者:Tamás Kálai、József Schindler、Mária Balog、Elemér Fogassy、Kálmán Hideg
DOI:10.1016/j.tet.2007.11.020
日期:2008.2
New, paramagnetic unnatural α-amino acids were synthesized by the O'Donnell method. In the new amino acids nitroxide is condensed with thiophene, benzene, and tetrahydroisoquinoline ring, or linked through a methylene, benzyl or propargyl spacer. Some of the racemic paramagnetic α-amino acid esters described earlier or in this work were resolved by fractional crystallization of diastereomeric salts
通过O'Donnell方法合成了新的顺磁性非天然α-氨基酸。在新的氨基酸中,氮氧化物与噻吩,苯和四氢异喹啉环缩合,或通过亚甲基,苄基或炔丙基间隔基连接。早先或本工作中描述的某些外消旋顺磁性α-氨基酸酯是通过非对映异构体盐的分步结晶而拆分的。光学活性顺磁性氨基酸的另一种方法是通过Pd催化的与顺磁性乙炔和顺磁性硼酸的交叉偶联反应来修饰S-酪氨酸衍生物。