We have developed an efficient method for solid phase peptide synthesis which consists of Nα-selective deprotection by dilute methanesulfonic acid, in situ neutralization, and rapid coupling reaction using benzotriazol-1-yl-oxy-tris(dimethylamino)phosphonium hexafluorophosphate or new 2-(benzotriazol-1-yl)oxy-1, 3-dimethylmidazolidinium hexafluorophosphate. This method was successfully used to synthesize several peptides using a new derivative, Boc-Tyr(Dpp) (Dpp : diphenylphosphinyl) and Boc-Arg(HCI) on a phenacylresin. For this method, we employed a fluoride ion final deprotection strategy based on a two-dimensional orthogonal protection scheme.
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Kiso et al. (1990) studied this question.