Fmoc-Sec(pMeOBzl)-OH

C₂₆H₂₅NO₅Se

510.44

Building block for the introduction of selenocysteine during Fmoc SPPS [1-3]. Selenocysteine derivatives can undergo enantiomerization during coupling and can form dehydroalanine and β-piperidinylalanine containing side products during subsequent chain elongation [3]. Therefore, activation methods, such as HBTU or PyBOP which involve the addition of a tertiary, base should be avoided for addtion of the Sec and all subsequent residues.



Cleavage and side-chain deprotection of Sec-containing peptides can be effected using tFA-m-cresol-thioanisole-EDT-water (80:5:5:5:5)[2] or TFA-water-DCM-TIS (89:5:51) at 4 °C [3]. As the Se-pMeOBzl bond is stable to TFA, these emthods result in formation of the corresponding Sev(pMeOBzl) peptide.



Peptides containing two Sec(pMeOBzl) residues can be oxidized directly to the corresponding selenocystinyl peptides by treatment with 5-10% DMSO in TFA [1-3].

Color (visual): white to yellow to beige
Appearance of substance (visual): powder
Identity (IR): passes test
Enantiomeric purity: ≥ 99.5 % (a/a)
Purity (TLC(157A)): ≥ 98 %
Assay (HPLC, area%): ≥ 98.0 % (a/a)
Solubility (1 mmole in 2 ml DMF): clearly soluble
For TLC-Systems see our General Catalog

Novabiochem is a registered trademark of Merck KGaA, Darmstadt, Germany

200

Novabiochem^®

≥98% (TLC)
≥98.0% (HPLC)

powder

reaction type: Fmoc solid-phase peptide synthesis

Novabiochem^®

Fmoc

2-8℃

GHS06,GHS08,GHS09

Danger

H301 + H331 - H315 - H335 - H373 - H410

P260 - P273 - P301 + P310 - P302 + P352 - P304 + P340 + P311 - P314

Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Aquatic Acute 1 - Aquatic Chronic 1 - Skin Irrit. 2 - STOT RE 2 - STOT SE 3

Respiratory system

6.1C - Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

WGK 3