反应详情

A mixture of 2-amino-5-bromo-4-chlorophenol (29). (865 mg, 3.89 mmol), trifluoromethanesulfonic acid Ytterbium (III) salt (24 mg, 1% mol) and trimethyl orthoformate (511 μl, 1.2 eq.) in 2 ml EtOH was heated at 90° C. for 2 h. After cooling down to r.t., the reaction mixture was taken up in EA, washed with aq. NaHCO3 and brine, dried over Na2SO4, concentrated to dryness. The resulting brown solid was dissolved in DCM and subjected to silica gel column purification using 0-100% B (A: hexane; B: 50% EA in hexane) to furnish 590 mg 30 as yellow solid (yield: 65.2%).

1. washwashed with aq. NaHCO3 and brine
2. dry with materialdried over Na2SO4
3. concentrationconcentrated to dryness
4. dissolutionThe resulting brown solid was dissolved in DCM
5. customsubjected to silica gel column purification