Dibenzyl formaminomalonate (IV), carbobenzyloxyaminomalonate (V) and formaminopiperidinomethylmalonate (11) were prepared and tested in condensation reactions with 2-phenyl-and 2-carbethoxy-3-diethylaminoindoles(VI11 and IX). XIII, the condensation product of V with IX, on catalytic debenzylation lost all three benzyl groups and gave 2-carbethoxytryptophan (XIX) in good yield. 2-Phenyltryptophan (XXI) and its ...
