Example 4

To a mixture of 1-butanol and MEK (60 mL, 1:1 V/V) was added compound (I) (502 mg, 1 equiv). The slurry was heated at 60° C. and HBr (4.8% solution in 1-butanol and MEK (2.5 mL, 2 equiv) was added. The mixture was stirred at 60° C. for 2 h and then 5° C. overnight. The solid was then recovered by filtration, washed with diethyl ether and characterized as a hydrobromide by XRPD, TGA, IR, Raman and DSC.

TABLE 5
XRPD of Compound (I) Hydrobromide
2θ angleRelative Intensity (%)
5.9100
10.027
11.941
13.830
17.329
19.425
21.329
21.656
22.041

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