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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]
HATU was first reported by Louis A. Carpino in 1993 as an efficient means of preparing active esters derived from 1-hydroxy-7-azabenzotriazole (HOAt). [2] HATU is commonly prepared from HOAt and TCFH under basic conditions [3] and can exist as either the uronium salt (O-form) or the less reactive iminium salt (N-form).
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 ]
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 ]