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A solution of sodium bis(trimethylsilyl)amide (1.7 ml) in tetrahydrofuran (1.0M, 1.7 mmol) was added over 5 minutes to a stirred mixture of 5-chloro-7-(3-methoxybut-1-yn-1-yl)-1,3-benzodioxol-4-amine (0.211 g) and 4-chloro-6,7-dimethoxyquinazoline (0.170 g) in DMF (7.0 ml) cooled to 0° C. under a nitrogen atmosphere; the resultant mixture was stirred for 1 hr at ambient temperature. The reaction mixture was diluted with saturated aqueous ammonium chloride (70 ml) and extracted with ethyl acetate (3×30 ml). The organic extracts were washed with brine (20 ml), dried over sodium sulphate and then evaporated. The residue was purified by column chromatography on silica using increasingly polar mixtures of ethyl acetate and isohexane as eluent. There was thus obtained the title compound as a racemate and in a solid form (0.200 g). NMR Spectrum: (DMSOd6) 1.41 (d, 3H), 3.35 (s, 3H), 3.92 (s, 6H), 4.39 (q, 1H), 6.15 (s, 2H), 7.13 (s, 1H), 7.18 (s, 1H), 7.82 (s, 1H), 8.32 (s, 1H), 9.50 (s, 1H);

1. extractionextracted with ethyl acetate (3×30 ml)
2. washThe organic extracts were washed with brine (20 ml)
3. dry with materialdried over sodium sulphate
4. customevaporated
5. customThe residue was purified by column chromatography on silica using
6. temperatureincreasingly polar mixtures of ethyl acetate and isohexane as eluent