反应详情

To 25.0 g (62.90 mmol) tert-butyl 1-(4-((4-ethoxyphenyl)ethynyl)phenyl)ethyl-carbamate (I62) in 375 mL EtOAc are added 79 mL (315 mmol) HCl (4M in dioxane). The mixture is stirred at r.t. over night, filtered and the obtained precipitate is dried. The crude product is suspended in DCM and sat. NaHCO3 is added until a clear solution is obtained. The layers are separated and the aqueous layer is extracted two more times with DCM. The organic layers are combined, washed with brine (1×), dried with Na2SO4 and the solvent is removed in vacuo. The residue is purified by column chromatography (silica gel, heptane/EtOAc/TEA 75/25/1→0/100/1).

1. filtrationfiltered
2. customthe obtained precipitate is dried
3. additionsat. NaHCO3 is added until a clear solution
4. customis obtained
5. customThe layers are separated
6. extractionthe aqueous layer is extracted two more times with DCM
7. washwashed with brine (1×)
8. dry with materialdried with Na2SO4
9. customthe solvent is removed in vacuo
10. customThe residue is purified by column chromatography (silica gel, heptane/EtOAc/TEA 75/25/1→0/100/1)