Synthesis of orthogonally protected hydroxylated azalkene-α,α′-bridged bis(α-glycine) and dihydroxylysine derivatives
摘要:
Stereoselective syntheses of hydroxylated azalkene-alpha,alpha'-bridged bis(alpha-glycine) derivatives and lysine derivatives are described. The bridge was formed as a secondary amine by a reductive dimerization process of two azide molecules upon hydrogenolysis over 5% palladium-on-charcoal. Lysine derivatives were formed by reduction of the azide function to a primary amine. In the target amino acids the vicinal dihydroxy functions were protected as acetonides, the N'-amino group as a Z-derivative and the alpha-amino groups as Fmoc-derivatives. (C) 1998 Elsevier Science Ltd. All rights reserved.
Synthesis of orthogonally protected hydroxylated azalkene-α,α′-bridged bis(α-glycine) and dihydroxylysine derivatives
摘要:
Stereoselective syntheses of hydroxylated azalkene-alpha,alpha'-bridged bis(alpha-glycine) derivatives and lysine derivatives are described. The bridge was formed as a secondary amine by a reductive dimerization process of two azide molecules upon hydrogenolysis over 5% palladium-on-charcoal. Lysine derivatives were formed by reduction of the azide function to a primary amine. In the target amino acids the vicinal dihydroxy functions were protected as acetonides, the N'-amino group as a Z-derivative and the alpha-amino groups as Fmoc-derivatives. (C) 1998 Elsevier Science Ltd. All rights reserved.