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Hydroxybenzotriazole (abbreviated HOBt) is an organic compound that is a derivative of benzotriazole.It is a white crystalline powder, which as a commercial product contains some water (~11.7% wt as the HOBt monohydrate crystal).
HBTU (Hexafluorophosphate Benzotriazole Tetramethyl Uronium) is a coupling reagent used in solid phase peptide synthesis. It was introduced in 1978 and shows resistance against racemization. It was introduced in 1978 and shows resistance against racemization.
HCTU is an amidinium coupling reagent used in peptide synthesis.It is analogous to HBTU. [1] The HOBt moiety has a chlorine in the 6 position which improves reaction rates and the synthesis of difficult couplings [2] [3] HCTU and related reagents containing the 6-chloro-1-hydroxybenzotriazole moiety can be prepared by reaction with TCFH under basic conditions. [4]
The Steglich esterification is a variation of an esterification with dicyclohexylcarbodiimide as a coupling reagent and 4-dimethylaminopyridine as a catalyst. The reaction was first described by Wolfgang Steglich in 1978. [ 1 ]
PyAOP ((7-Azabenzotriazol-1-yloxy)tripyrrolidinophosphonium hexafluorophosphate) is a reagent used to prepare amides from carboxylic acids and amines in the context of peptide synthesis. [1] It can be prepared from 1-hydroxy-7-azabenzotriazole (HOAt) and a chlorophosphonium reagent under basic conditions. [ 2 ]
1-Hydroxy-7-azabenzotriazole (HOAt) is a triazole used as a peptide coupling reagent. [2] It suppresses racemization that can otherwise occur during the reaction. [3] HOAt has a melting point of 213-216 °C. [4]
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BOP (benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate) is a reagent commonly used for the synthesis of amides from carboxylic acids and amines in peptide synthesis. [1] [2] It can be prepared from 1-hydroxybenzotriazole and a chlorophosphonium reagent under basic conditions. [3]