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AFR105

[154445-77-9]
Fmoc-Arg(Pbf)-OH

Fmoc-Arg(Pbf)-OH has been introduced to reduce the alkylation of tryptophan-containing peptides during final deprotection. Like the Pmc group, the Pbf group of Fmoc-Arg(Pbf)-OH can be cleaved under moderate acid conditions. However, the amount of tryptophan alkylation is significantly reduced, especially in the absence of scavengers. One example reported in the literature showed a 3 hour cleavage and deprotection treatment with TFA resulted 46% of the desired peptide when Fmoc-Arg(Pmc) was used versus 69% when Fmoc-Arg(Pbf) was used (C.G. Fields, G.B. Fields Tetrahedron Lett. 1993, 34, 6661-6664.)
C34H40N4O7S

648.7
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$ 45
$ 160
$ 455
AFR110

[119831-72-0]
Fmoc-Arg(Pmc)-OH

C35H42N4O7S

662.8
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$ 50
$ 200
$ 600
AFR120

[83792-47-6]
Fmoc-Arg(Tos)-OH

C28H30N4O6S

550.6
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$ 155
$ 450
AFR101

[91000-69-0]
Fmoc-Arg-OH

C21H24N4O4

396.4
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$ 125
$ 375
AFN105

[132388-59-1]
Fmoc-Asn(Trt)-OH

Using Fmoc-Asn(Trt)-OH and Fmoc-Gln(Trt)-OH in peptide synthesis prevents the possibility of the amide side chains of Asn and Gln from undergoing dehydration side reactions during activation, especially with carbodiimide reagents. Fmoc-Asn(Trt)-OH and Fmoc-Gln(Trt)-OH also have better solubility properties than Fmoc-Asn-OH or Fmoc-Gln-OH. Fmoc-Asn(Trt)-OH and Fmoc-Gln(Trt)-OH dissolve readily in all standard peptide synthesis reagents, while Fmoc-Asn-OH and Fmoc-Gln-OH are barely soluble in dimethylformamide (DMF).
C38H32N2O5

596.7
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$ 80
$ 240
AFN101

[71989-16-7]
Fmoc-Asn-OH

C19H18N2O5

354.4
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$ 60
$ 240
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