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0 °C

In a 500 ml round-bottomed flask, under argon flush, methyl 3-hydroxybenzoate (5 g, 32.9 mmol) was dissolved in dichloromethane (100 ml) to give a white suspension. The reaction mixture was cooled at 0° C. At that temperature chloro(methyloxy)methane (2.75 ml, 36.1 mmol) and DIPEA (6.89 ml, 39.4 mmol) were added. The reaction mixture was stirred overnight. During that time, the reaction temperature was allowed to reach room temperature. The reaction mixture was then evaporated under vacuum to afford the crude product as a yellow oil which was purified by silica gel chromatography (Biotage SP1 system, 50 g SNAP column) with Cyclohexane/EtOAc as eluents (from 10/0 to 3/1 in 10 CV; then 3/1 for 5 CV). The collected fractions afforded the title compound (5.088 g).

1. customIn a 500 ml round-bottomed flask, under argon flush
2. customto give a white suspension
3. customto reach room temperature
4. customThe reaction mixture was then evaporated under vacuum
5. customto afford the crude product as a yellow oil which
6. customwas purified by silica gel chromatography (Biotage SP1 system, 50 g SNAP column) with Cyclohexane/EtOAc as eluents (from 10/0 to 3/1 in 10 CV