Precursor compound 1 was prepared in seven steps according to our previously published route for the synthesis of the corresponding phosphoramidite building block for RNA solid-phase synthesis.
Two strategies directed towards the synthesis of a building block suitable for solid-phase peptide synthesis were developed: a chemoenzymatic route, involving l-threonine aldolase, and an enantioselective chemical route; these led to α,γ-diamino-β-hydroxybutanoic acids in diastereoisomerically mixed and enantiopure forms, respectively.
By employing three orthogonally protected Tyr building blocks and a solid-phase sulfation protocol, we demonstrate the synthesis of a library of target N-terminal CCR5 2-22 CCR5 2-22msulfoformsdiscrete and differential sulfation at Tyr10, Tyr14, and Tyr15, from a single resin-bearingntermediscrete
To probe the effect of the sugar-dendrimer linker on binding, carboxypropyl β-thiogalactoside (GalB) was also introduced as the last building block in solid-phase peptide synthesis to provide dendrimers GalA/BG1 and GalA/BG2, and the linear peptides GalA/BG0.
These building blocks were employed in solid-phase PNA synthesis and it was shown that Boc/S-p-methoxybenzyl protection scheme was only satisfactory for the introduction of N-terminal thiol modification while the Fmoc/S-butylthio protected monomer proved to be amenable to elongation.
For the synthesis of 2′-azido building blocks 7 and 17 and for solid-phase synthesis, deprotection, purification, and mass spectrometry of 2′-azido modified RNA, see the Supporting Information.
Instead stick to a long-term strategy and use consistently performing funds (preferably ones with low expenses) as building blocks for a solid portfolio.
A common strategy for the attachment of ligands to peptides is based on the incorporation of artificial amino acid building blocks by solid phase peptide synthesis (Dirscherl and König 2008; Levadala et al. 2004; Cheng et al. 2005; Damian et al. 2010).
Reactions were followed as described for solid-phase binding assays.
This paper proposes new building blocks for the lattice structure of oversampled linear-phase perfect reconstruction filter banks (OLPPRFBs).
