The application of anisole in greener solid-phase peptide synthesis protocols – Compatibility with green bases in Fmoc removal and new green binary mixture for coupling
side product of SPPS. We also introduced a new green solvent mixture, anisole/dimethyl sulfoxide (DMSO) (4:1) for acylation step, which did not cause racemization. The applicability of these new green protocols was shown during SPPS of the pentapeptides Leu-enkephalin and Aib-enkephalin using polystyrene (PS)-based resins. Additionally, we identified the new sequence-dependent side products that formed
Environmentally Friendly SPPS II: Scope of Green Fmoc Removal Protocol Using NaOH and Its Application for Synthesis of Commercial Drug Triptorelin
作者:Adam Přibylka、Viktor Krchňák、Eva Schütznerová
DOI:10.1021/acs.joc.0c00599
日期:2020.7.17
temperature, and reaction time. An alternative 3:1 protocol was examined using various aminoacids, and only Gly required the optimization of the Fmoc removal cocktail composition. The optimizedprotocol used to remove Fmoc from Gly residue was proved by the synthesis of Leu-enkephalin. We also investigated the stability of the conventional aminoacid side-chain-protecting groups, t-Bu, Boc, Trt, and
Improved methods of native chemical ligation are provided. The methods involve reacting a thioacid (e.g. a peptide thioacid) with an aziridinyl compound (e.g. an aziridinyl peptide) under mild conditions without the use of protecting groups, and without requiring that a cysteine residue be present in the ligation product. Initial coupling of the thioacid and the aziridinyl compound yields a ligation product which contains an aziridinyl ring. Subsequent opening of the aziridinyl ring (e.g. via a nucleophilic attack) produces a linearized and modified ligation product.
ligation site. The aziridine-mediated peptide ligation concept is exemplified using H(2)O as the nucleophile, producing a Xaa-Thr linkage (where Xaa can be an epimerizable and hindered aminoacid). The overall process is compatible with a variety of unprotectedaminoacid functionality, most notably the N-terminal and Lys side chain amines.