A short synthesis of chiral peraza-macrocycles through opening of cyclic sulfamidates
摘要:
Efficient and general synthetic methods for novel chiral peraza-macrocycles have been developed. Sequential reactions of the known cyclic sulfamidate 4 derived from N-benzyl-L-serine methyl ester with p-methoxybenzylamine provided a symmetric triamine 3, which served as a building block for the construction of various chiral peraza-macrocycles. Reaction of the triamine. with a proper connecting unit provided [18]-N-6 or [10]-N-3 chiral peraza-macrocycles. (C) 1999 Elsevier Science Ltd. All rights reserved.
A Short Synthesis of Conformationally Constrained Unnatural Bicyclic Amino Acids Containing a Nitrogen Atom at the Ring Juncture: (9a<i>R</i>)- and (9a<i>S</i>)-Octahydropyrido[1,2-<i>a</i>]pyrazine-(3<i>S</i>)-carboxylic Acids (Opc)
A short and efficientroute to conformationally constrained amino acid analogues, (9a R)- and (9a S)-octahydropyrido[1,2- A]pyrazine-(3 S)-carboxylate (Opc) has been developed. The new bicyclic amino acid derivatives can be stored and utilized as a modular unit for the construction of unnatural oligopeptides using conventional peptide coupling methods.