Krasikova RN, Zaitsev VV, Ametamey SM, Kuznetsova OF, Fedorova OS, Mosevich IK, Belokon YN, Vyskocil S, Shatik SV, Nader M, Schubiger PA. Catalytic enantioselective synthesis of 18F-fluorinated α-amino acids under phase-transfer conditions using (s)-NOBIN.
Nucl Med Biol 2004;
31:597-603. [PMID:
15219278 DOI:
10.1016/j.nucmedbio.2003.12.010]
[Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
We describe a new method for the asymmetric synthesis of [(18)F]fluorinated aromatic alpha-amino acids (FAA) under phase transfer conditions using achiral glycine derivative NiPBPGly and (S)-NOBIN as a novel substrate/catalyst pair. The key alkylation step proceeds under mild conditions. Substituted [(18)F]fluorobenzylbromides were prepared using nucleophilic [(18)F]fluoride and were used as alkylation agents. Two important FAA, 2-[(18)F]fluoro-L-tyrosine (2-FTYR) and 6-[(18)F]fluoro-L-3,4-dihydroxyphenylalanine (6-FDOPA), were synthesized with an ee of 92 and 96%, respectively. The total synthesis time was 110-120 min and radiochemical yields (d.c.) were 25+/-6% for 2-FTYR and 16+/-5% for 6-FDOPA.
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