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A solution of alkylated salt 2 (2.58 g, 9.65 mmol) in 20% aqueous NaOH solution (29.0 mmol) was heated at reflux for 16 h. The crude reaction mixture was evaporated to dryness and purified by silica gel column chromatography (CHCl3/MeOH, 10:1 (v/v), as eluent), to yield 3 (1.1 g, 93%) as a pale, brown powder; mp: 123-126° C. 1H NMR (CDCl3, 300 MHz) δ: 2.13 (s, 3H), 2.50 (s, 3H), 6.93 (s, 1H). Mass Spectrum: CI, m/z 124 (M+1).

1. temperatureat reflux for 16 h
2. customThe crude reaction mixture
3. customwas evaporated to dryness
4. custompurified by silica gel column chromatography (CHCl3/MeOH, 10:1 (v/v), as eluent)