Concise Preparation of Tetra-orthogonally Protected (2<i>S</i>,6<i>R</i>)-Lanthionines
作者:Nathaniel I. Martin
DOI:10.1021/jo802415c
日期:2009.1.16
Lantibiotics are antimicrobial peptides containing the unique bis-amino acids lanthionine and beta-methyllanthionine. While previous syntheses of lanthionine have often involved the coupling of precursors derived from D-serine and L-Cysteine, we here report an inverted strategy whereby D-cysteine and L-serine are employed as building blocks. This approach provides for a concise preparation of tetra-ortogonally protected (2R,6S)-lanthionines while allowing convenient introduction of orthogonal protecting groups not previously incorporated into lanthionines.
The present invention provides a method of synthesizing an intramolecularly bridged polypeptide comprising at least one intramolecular bridge. The present invention further provides a method of synthesizing an intramolecularly bridged polypeptide comprising two intramolecular bridges, wherein the two intramolecular bridges form two overlapping ring, two rings in series, or two embedded rings. The present invention also provides methods for synthesizing lantibiotics, including Nisin A. Additionally, the invention provides intramolecularly bridged polypeptides synthesized by the methods disclosed herein and differentially protected orthogonal lanthionines.