反应详情

The product of Step 1 (4.00 g, 16.05 mmol) was taken up in DCE (80 ml) with triethylsilane (25.6 ml, 160 mmol), and trifluoroacetic acid (24.72 ml, 321 mmol) was added. The reaction was stirred at reflux overnight. The reaction was diluted with toluene and evaporated to dryness. The residue was taken back up in EtOAc, washed with aqueous saturated NaHCO3 and brine, dried over MgSO4, filtered and concentrated. Flash chromatography (0-50% EtOAc/hexanes) afforded methyl 4-(1,3-thiazol-2-ylmethyl)benzoate (3.13 g, 13.42 mmol, 84% yield) as a pale yellow gum that crystallized upon standing. MS ESI: [M+H]+ m/z 234.1.

1. additionwas added
2. temperatureat reflux overnight
3. customevaporated to dryness
4. washwashed with aqueous saturated NaHCO3 and brine
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated