The synthesis of functionalised peptides using α-lithio quinuclidine N-oxide (Li-QNO)
摘要:
Deprotonation of protected peptides using lithiated quinuclidine N-oxide (Li-QNO) as a base at 0 degrees C, followed by addition of an alkyl halide gives C-alkylated peptide derivatives in good yield. (C) 2009 Elsevier Ltd. All rights reserved.
N-Methylation of carbamate derivatives of α-amino acids
作者:Christopher J. Easton、Katherine Kociuba、Steven C. Peters
DOI:10.1039/c39910001475
日期:——
Carbamate derivatives of α-aminoacids react by N-methylation, without racemization, on treatment with tert-butyl perbenzoate in the presence of copper(II) octanoate; the selective reaction of N-tert-butoxycarbonylglycine methyl ester, in preference to the corresponding alanine and valine derivatives, indicates that the relative reactivity of substrates is determined by the comparative ease of their