反应详情

To a slurry of 4-hydroxythiophenol (259.4 g, 2.06 mol) and potassium carbonate (284.2 g, 2.06 mol) in 500 mL of DMF at 0° C. was added tert-butyl 3-chloropivaloate (373.8 g, 1.94 mol) dropwise over 2 hours. After stirring to room temperature overnight, the reaction was heated to 110° C. for 3 hours. The reaction was allowed to cool for room temperature and water and ether were added. The layers were separated and the organic layer washed with water and 5% NaOH, dried over MgSO4 and concentrated. The resulting oil was recrystallized from 1:3 CH2Cl2 /pet. ether to afford 328.0 g (60%) of the desired product. mp 100°-100.5° C.; 1H NMR (CDCl3) δ1.22 (s,6H), 1.44 (s,9H), 3.07 (s,2H), 5.42 (br s,1H,--OH), 6.77 (d,2H,J=8.7 Hz); 13C NMR (CDCl3) δ 24.62, 27.73, 44.58, 46.86, 81.00, 116.2, 127.7, 133.5, 155.4, 176.7; IR (KBr, film) 3362, 2971, 1720, 1693, 1600, 1583, 1495, 1472, 1366, 1320, 1223, 1150(s), 835, 817 cm-1.

1. temperaturethe reaction was heated to 110° C. for 3 hours
2. temperatureto cool for room temperature
3. customThe layers were separated
4. washthe organic layer washed with water and 5% NaOH
5. dry with materialdried over MgSO4
6. concentrationconcentrated
7. customThe resulting oil was recrystallized from 1:3 CH2Cl2 /pet. ether