title: [Studies on the Nin-formyl group as possible protecting group against tryptophan indole side chain tert-butylation (author's transl)].
abstract: Investigations on the Nin-formyl group as a protecting group of the tryptophan indole side chain under the conditions of conventional peptide synthesis using model compounds are described. The protecting group prevents the tert-butylation of tryptophan residues during acidolytic removal of tert-butyloxycarbonyl groups and allows the preparation of tryptophan tert-butylester in good yields. However, because of the observed side reactions, as hydrogenation of the indole to a 2,3-dihydroindole side chain, instability of the protecting group under various experimental conditions, the Nin-formyl group is only of limited use in peptide synthesis.
mesh_terms: D005561:Formates; D007211:Indoles; D008722:Methods; D009904:Optical Rotation; D010455:Peptides / Q000138:chemical synthesis; D013056:Spectrophotometry, Ultraviolet; D014364:Tryptophan
chemical_list: D005561:Formates; D007211:Indoles; D010455:Peptides; D014364:Tryptophan
vernacular_title: Untersuchungen über den Nin-Formylrest als mögliche Schutzgruppe gegen Tryptophan-tert-Butylierung.