Hydrochloric Acid → 1-[4-(pyrazin-2-yl)-phenyl]-4(S)-hydroxy-2-amino-5(S)-N-(N-methoxycarbonyl-(L)-valyl)amino-6-phenyl-2-azahexane hydrochloride

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Reaction Steps

3.4 g (5.5 mmol) of 1-[4-(pyrazin-2-yl)-phenyl]-4(S)-hydroxy-2-(tert-butoxycarbonyl)amino-5(S)-N-(N-methoxycarbonyl-(L)-valyl)amino-6-phenyl-2-azahexane in 100 ml of 4 N hydrogen chloride in dioxane (Aldrich) and 10 ml of methanol are stirred at room temperature for 2 hours. The solvents are removed; dioxane is added twice to the residue and evaporated off. The title compound is obtained in the form of a viscous oil, with the compound crystallising out on trituration with ether. M.p.: 194-198° C. TLC: Rf =0.35 (methylene chloride/methanol 10:1). HPLC20-100 : tRet =9.77.

Provenance & Evidence