反应详情

A mixture of D47 (395 mg, 0.978 mmol) and lithium hydroxide monohydrate (82 mg, 1.95 mmol) in water (5 ml) and 1,4-dioxane (10 ml) was stirred at room temperature for 3 days. The solvents were removed in vacuo and the residue dissolved in water. The solution was washed with ether, acidified to pH4 with 1M HCl then extracted with DCM (×2). The combined organics were dried (Na2SO4) and concentrated in vacuo to give the title compound as a yellow foam (316 mg). δH (CDCl3, 250 MHz) 7.35 (4H, m), 4.11 (2H, br), 3.71 (2H, br), 2.67 (2H, br), 2.17 (2H, br), 1.61 (6H, s), 1.46 (9H, s), 1.33 (6H, br d). MS (ES): MH+ 391, (M−H+) 389.

1. customThe solvents were removed in vacuo
2. dissolutionthe residue dissolved in water
3. washThe solution was washed with ether
4. extractionthen extracted with DCM (×2)
5. dry with materialThe combined organics were dried (Na2SO4)
6. concentrationconcentrated in vacuo