Detailed Explanation
Fluorenylmethyloxycarbonyl — the base-labile protecting group used for the α-amino group in modern solid-phase peptide synthesis (SPPS). Fmoc is removed with 20% piperidine in DMF at each deprotection step, releasing dibenzofulvene (which absorbs UV at 301 nm, enabling real-time monitoring of coupling efficiency).
Fmoc/tBu chemistry has become the dominant SPPS method because it uses milder conditions than the older Boc/Bzl approach (which requires hazardous HF for final cleavage). The orthogonality of Fmoc (base-labile) with tBu side-chain protecting groups (acid-labile) allows selective deprotection at each step.
Key Facts
- Fluorenylmethyloxycarbonyl — the base-labile protecting group used for the α-amino group in modern solid-phase peptide synthesis (SPPS).
- Fmoc is removed with 20% piperidine in DMF at each deprotection step, releasing dibenzofulvene (which absorbs UV at 301 nm, enabling real-time monitoring of coupling efficiency).
- Fmoc/tBu chemistry has become the dominant SPPS method because it uses milder conditions than the older Boc/Bzl approach (which requires hazardous HF for final cleavage).
- The orthogonality of Fmoc (base-labile) with tBu side-chain protecting groups (acid-labile) allows selective deprotection at each step.
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