Late-Stage N-Alkylation of Azapeptides

Org Lett. 2022 Mar 11;24(9):1768-1773. doi: 10.1021/acs.orglett.2c00046. Epub 2022 Feb 28.

Abstract

Azapeptides undergo on-resin, late-stage N-alkylations to install side chains with high chemoselectivity for the hydrazide nitrogen atoms. The major product is the N1-alkylated "azapeptoid", with only small amounts (<10%) of alkylation occurring at the other aza-amino acid nitrogen (N2). Dialkylations are also possible and afford highly functionalized, disubstituted azapeptides with side chains installed on both aza-amino acid nitrogen atoms. The site-selectivity was determined using Edman degradation, MS/MS sequencing, and comparative LCMS and NMR analyses.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkylation
  • Amino Acids
  • Aza Compounds* / chemistry
  • Nitrogen
  • Tandem Mass Spectrometry

Substances

  • Amino Acids
  • Aza Compounds
  • Nitrogen