The invention provides compound which is an
18
F-radiolabelled S-propylhomocysteine or a derivative thereof. The compound has an enantiomeric purity of at least about 90%.
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F-radiolabelled S-propylhomocysteine may be made by treating an N-protected ester of a substituted S-propylhomocysteine with a complexed F″ salt in the presence of a base to form a protected product and then deprotecting the protected product to form the
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F-radiolabelled S-propylhomocysteine. In this method the N-protected ester has a leaving group on the S-propyl group and has an enantiomeric purity of at least about 90%. The base should be such that it does not cause racemisation of the protected product.
本发明提供了一种化合物,该化合物是18F放射性标记的S-丙基同型半胱
氨酸或其衍
生物。该化合物具有至少约90%的对映异构体纯度。可以通过在碱存在下用复合的F″盐处理替代的S-丙基同型半胱
氨酸的N-保护酯以形成受保护的产物,然后去保护以形成18F放射性标记的S-丙基同型半胱
氨酸来制备18F放射性标记的S-丙基同型半胱
氨酸。在该方法中,N-保护酯在S-丙基基团上具有离去基,并且具有至少约90%的对映异构体纯度。碱应该是不会引起受保护产物的旋光异构化的碱。