Total synthesis of µ-conotoxin lt5d.

The total synthesis of µ-conotoxin lt5d is presented for the first time employing two different strategies. One involves glutathione-assisted oxidation where all disulphide linkages are formed simultaneously. Another involves orthogonal protection of cysteine residues, allowing the controlled formation of disulphide linkages sequentially. Both methods achieve the same peptide.

Synthesis and bioactivity of nobilamide B.

An alternative and facile solution/solid-phase approach is reported for the total synthesis of neuroactive peptide, nobilamide B. Z-Dhb was formed in solution via EDC/CuCl induced elimination. The solid-phase synthesis employed HBTU/Oxyma Pure™ coupling using Barlos resin. Synthetic nobilamide B was also found to be neuroactive in primary cultures of dorsal root ganglion (DRG) neurons.