The compound O-(2-[
18
F]fluoroethyl)-L-tyrosine has proven to be particularly suitable for positron emission tomography and has already been tested in clinical practice. Until now, the compound has been prepared according to a relatively laborious method (Wester H. J. et al., J. Nucl. Med. 1999; 40: 205-212).
The invention relates to L-tyrosine derivatives of the formula (1)
whereby R
1
represents a suitable protective group for the carboxy group, R
2
a suitable protective group for the amino group and R
3
a suitable leaving group,
R
1
represents a methylthiomethyl group, a tetrahydrofuranyl group, a diphenylmethyl group, a para-methoxybenzyl group, a piperonyl group or a tert-butyl group, R
2
an alkyl- or an arylalkyl group and R
3
a p-tosyloxy, methanesulfonyloxy, trifluoromethanesulfonyloxy or bromine.
The invention also relates to a method for preparing O-(2-[
18
F]-fluoroethyl)-L-tyrosine from the initial compounds of formula (1) and method for the preparation of these initial compounds.
化合物O-(2-[18F]
氟乙基)-
L-酪氨酸已被证明特别适用于正电子发射断层扫描,并已在临床实践中进行了测试。到目前为止,该化合物已根据相对繁琐的方法制备(Wester H. J. et al.,J. Nucl. Med. 1999; 40: 205-212)。本发明涉及公式(1)的
L-酪氨酸衍
生物,其中R1代表羧基的适当保护基,R2代表
氨基的适当保护基,R3代表适当的离去基,R1代表甲
硫基甲基、
四氢呋喃基、二苯甲基基、对甲氧基苄基、
吡哆醛基或叔丁基,R2代表烷基或芳基烷基,R3代表对
甲苯磺酸酯氧基、
甲磺酸酯氧基、
三氟甲磺酸酯氧基或
溴。本发明还涉及一种从公式(1)的初始化合物制备O-(2-[18F]
氟乙基)-
L-酪氨酸的方法,以及制备这些初始化合物的方法。