Hydrochloric Acid → (5R,8S)-7-[(S)-2-((S)-2-Amino-2-cyclohexyl-acetylamino)-3,3-dimethyl-butyryl]-10,10-dimethyl-7-aza-dispiro[3.0.4.1]decane-8-carboxylic acid methyl ester

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Reaction Steps

A mixture of (5R,8S)-7-[(S)-2-((S)-2-tert-Butoxycarbonylamino-2-cyclohexyl-acetylamino)-3,3-dimethyl-butyryl]-10,10-dimethyl-7-aza-dispiro[3.0.4.1]decane-8-carboxylic acid methyl ester (0.755 g; 1.31 mmol) and 4.9 mL HCl (4 M in dioxane) in 10 mL dioxane was stirred overnight at ambient temperature. The mixture was concentrated under reduced pressure to yield the title compound which was used in the next step without further purification. LC-MS (method E): Rt=1.47 min; M/z=476 [M+]; HPLC (method A3): Rt=4.27 min

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