反应详情

温度

100 °C

A mixture of 6-hydroxy-3,4-dihydro-1H-isoquinoline-2-carboxylic acid tert-butyl ester (1.1 g, 4.4 mmol), cesium carbonate (4.3 g, 13 mmol), and methanesulfonic acid 4-tert-butyl-cyclohexyl ester (2.2 g, 8.8 mmol) in t-BuOH (12 mL) and 2-butanone (6.0 mL) was heated in a sealed vial at 100° C. overnight. The mixture was partitioned between water and ether. The organic phase was washed with water, dried over MgSO4, filtered and concentrated. The residue was purified via a silica gel column eluted with EtOAc in hexanes from 0 to 30% to give white precipitate (1.0 g, yield: 58%). 1H NMR (400 MHz, CDCl3) δ 6.99 (d, 1H), 6.74 (dd, 1H), 6.67 (d, 1H), 4.49 (s, 2H), 4.07 (m, 1H), 3.61 (s, 2H), 2.78 (m, 2H), 2.18 (d, 2H), 1.85 (d, 2H), 1.48 (s, 9H), 1.37 (m, 2H), 1.18-1.00 (m, 3H), 0.87 (s, 9H).

1. customThe mixture was partitioned between water and ether
2. washThe organic phase was washed with water
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated
6. customThe residue was purified via a silica gel column
7. washeluted with EtOAc in hexanes from 0 to 30%