| 摘要 |
A Novel N-substituted peptidyl compound represented by the general formula (1): <IMAGE> (1) where R1 is a straight-chained or branched acyl group having 2-10 carbon atoms, a branched, cyclic or bridged cyclic alkyloxycarbonyl group having 4-15 carbon atoms; a benzyloxycarbonyl group which is unsubstituted or substituted with a halogen atom, nitro group or methoxy group; a 2,2,2-trichloroethyloxycarbonyl group, a 2-(trimethylsilyl)ethyloxycarbonyl group, a p-toluensulfonyl group, an o-nitrophenylsulfenyl group, a diphenylphosphonothioyl group, a triphenylmethyl group, a 2-benzoyl-1-methylvinyl group; R2 is a hydrogen atom or when taken together with R1, may form a phthaloyl group; R3 is an isobutyl group, a n-butyl group or an isopropyl group; R4 is a butyl group, and R5 is a hydrogen atom; provided that R1 can be an unsubstituted benzyloxycarbonyl group only when R3 is a n-butyl group.
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