Tetrahedron Letters p. 2565 - 2568 (1981)
Update date:2022-08-10
Topics:
Hino, Tohru
Taniguchi, Mikio
Yamamoto, Ichiro
Yamaguchi, Keiichi
Nakagawa, Masako
Two stereoisomeric cyclic tautomers (5 and 6) of cyclo-L-tryptophanyl-L-proline whose stereochemistry was established by x-ray analysis, gave 5- and 6-hydroxytryptophanyl derivatives (10, 11 and 19) on the hydroxylation with lead tetraacetate in trifluoroacetic acid.
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