Hydrogen Bromide → (2R)-2-amino-6-[4-[(2S)-2-amino-2-carboxyethyl]-3-[(3S)-3-amino-3-carboxypropyl]-5-hydroxypyridin-1-ium-1-yl]hexanoate

Participants

Role	Name	HCID	Charge
Reactant	Hydrogen Bromide	HCID 260	—
Reactant	3-Hydroxy-1-(5-benzoxycarbonylamino-5-t-butoxycarbonyl-pentyl)-4-(2-benzyloxycarbonylamino-2-t-butoxycarbonyl-ethyl)-5-(3-benzyloxycarbonylamino-3-butoxycarbonylpropyl) pyridinium	HCID 88012083	—
Product	(2R)-2-amino-6-[4-[(2S)-2-amino-2-carboxyethyl]-3-[(3S)-3-amino-3-carboxypropyl]-5-hydroxypyridin-1-ium-1-yl]hexanoate	HCID 105071	—

reacting the pyridinium salt prepared in step (c) with HBr in an appropriate solvent to provide deoxypyridinoline.