Hydrogen Bromide → HCID 23119569, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 3-(p-methoxyphenylsulfonylamino)-1-propinyl 3,4,5-trimethoxy-phenyl ketone (2.02 g, 2.78 mmol, Example 94c) in CH2Cl2 (10 ml) a solution of HBr (732 μl, 1.5 equiv., 33% in acetic acid) is added at 4° C. The reaction mixture is stirred for 45 min at 4° C., and poured onto ice, saturated aqueous NaHCO3 solution and ethyl acetate. The organic layer is dried (MgSO4), the solvents are evaporated and the residue chromatographed on SiO2 with ethyl acetate/hexane (1:3) to yield the title compound (2.0 g, 86.3%) as a pink solid. 1H-NMR (300 MHz, DMSO-d6): 7.65 (d, J=1.9, 1H); 7.38 (d, J=9.0, 2H); 7.02 (d, J=9.0, 2H); 6.40 (m, 3H); 3.82 (s, MeO); 3.72 (s, MeO); 3.69 (s, 2MeO).

Provenance & Evidence