Abstract
Tetrahydropyranyl (Thp), which exploits the concept of being an S,O-acetal nonaromatic protecting group for cysteine, has been shown to be superior to Trt, Dpm, Acm, and StBu in solid-phase peptide synthesis using the Fmoc/tBu strategy. Thus, Cys racemization and C-terminal 3-(1-piperidinyl)alanine formation were minimized when the Cys was protected with Thp. This nonaromatic protecting group also improved the solubility of Cys-containing protected peptides.
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