Efficient Acylation of the N-Terminus of Highly Hindered Cα,α-Disubstituted Amino Acids via Amino Acid Symmetrical Anhydrides
摘要:
GRAPHICSFmoc amino acid symmetrical anhydrides are efficient and readily available reagents for acylation of the N-terminus of highly hindered C-alpha,C-alpha-dialkylated alpha-amino acids. Comparison of a variety of coupling protocols showed that the symmetrical anhydride method always provided the superior results. This method was successfully applied to the solid-phase synthesis of a peptide containing three alphaalphaAAs at alternating positions.
Carpino, Louis A.; Sadat-Aalaee, Dean; Chao, Hann Guang, Journal of the American Chemical Society, 1990, vol. 112, # 26, p. 9651 - 9652
作者:Carpino, Louis A.、Sadat-Aalaee, Dean、Chao, Hann Guang、DeSelms, Robert H.
DOI:——
日期:——
Rapid, Continuous Solution-Phase Peptide Synthesis: Application to Peptides of Pharmaceutical Interest
作者:Louis A. Carpino、Shahnaz Ghassemi、Dumitru Ionescu、Mohamed Ismail、Dean Sadat-Aalaee、George A. Truran、E. M. E. Mansour、Gary A. Siwruk、John S. Eynon、Barry Morgan
DOI:10.1021/op0202179
日期:2003.1.1
The Fmoc/TAEA and Bsmoc/TAEA methods for the rapid, continuous solution synthesis of peptide segments are shown to be applicable to the gram-scale synthesis of short peptides as well as, for the first time, to the synthesis of a relatively long (22-mer) segment, (hPTH 13-34). In the latter case the crude product was of significantly greater purity than a sample obtained via a solid-phase protocol. The Bsmoc methodology was optimized by a new technique involving filtration of the growing partially deprotected peptide at each coupling-deprotection cycle through a short column of silica gel.
STINSON, STEPHEN, CHEM. AND ENG. NEWS , 68,(1990) N2, C. 6