B. Herbert et al., Synthesis of 2-fluoro- and 6-fluoro-(2S,3R)-(3,4-dihydroxyphenyl) serine as potential in vivo precursors of fluorinated norepinephrines, J ORG CHEM, 66(14), 2001, pp. 4892-4897
The title compounds were prepared by the aldol condensation of 3,4-dibenzyl
oxy-2-fluorobenzaldehyde and 4,5-dibenzyloxy-2-fluorobenzaldehyde with the
oxazolidinone 2, a chiral glycine equivalent. Removal of the chiral auxilia
ry and blocking groups produced the target amino acids 2-fluoro- and 6-fluo
ro-(2S,3R)-(3,4-dihydroxyphenyl)serine (1b and 1c) in > 98% ee.