104945-71-3

Upstream product

• 7536-58-5 BOC-L-aspartic acid 4-benzyl ester 
• 2177-63-1 (S)-2-amino-4-(benzyloxy)-4-oxobutanoic acid 
• 24424-99-5 di-tert-butyl dicarbonate 
• 104945-70-2 Boc-Asp(Bzl)-OBt 
• 104945-69-9 H-Met-Glu(Bzl)-Tyr(Bzl)-OMe trifluoroacetic salt 

Downstream Products

• 104945-73-5 H-Asp(Bzl)-Met-Glu(Bzl)-Tyr(Bzl)-OMe trifluoroacetic salt 

Relevant academic research and scientific papers

Synthesis of a putative antigenic heptapeptide from Escherichia coli K88 ab protein fimbriae.

The heptapeptide Tyr-Arg-Glu-Asp-Met-Glu-Tyr-OMe, spanning region 213-219 of Escherichia coli K88 ab protein fimbriae, was synthesized with an overall yield of 37% using dicyclohexylcarbodiimide (DCC) and 1-hydroxybenzotriazole (HOBt) preactivation in all condensation reactions. The C-terminal was protected as the methyl ester. The protection scheme of N alpha-tert-butyloxycarbonyl-(Boc) and benzyl-(Bzl) or benzyloxycarbonyl (Z) groups for side chain protection was found to be orthogonal when a mixture of trifluoroacetic acid (TFA), phenol (PhOH) and p-cresol (CrOH) was used for repetitive deprotection. The final deprotection of Boc-Tyr(Bzl)-Arg(Z2)-Glu(Bzl)-Asp(Bzl)-Met-Glu(Bzl+ ++)-Tyr(Bzl)-OMe (17) was accomplished in 80% yield by prolonged treatment with hydrogen fluoride, dimethyl sulfide, p-cresol and p-thiocresol. The BSA-linked synthetic peptide was used in immunisation experiments on rabbits.