Abstract
The new photolabile protecting groups 4-allyl-5-methoxy-3-nitrobenzyl (AMNB) and 4-allyl-5-methoxy-3-nitrobenzyloxycarbonyl (AMNBOC) with an allylic side chain can easily be obtained from vanillin. These protecting groups can be introduced on the C- as well as on the N-terminus of peptides, and subsequent ring-closing metatheses provides a straightforward protocol for the synthesis of cyclic peptides. The protecting groups can be removed under UVA irradiation (365 nm).
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