反应详情

温度

-78 °C

34 g (13.0 mmol) N-[2-(3-methoxy-4-pent-2-ynyloxy-phenyl)-ethyl]-formamide and 4.3 ml (32 mmol) triethylamine are dissolved in 13 ml CH2Cl2. 1.4 g (4.7 mmol) bis(trichloromethyl) carbonate (triphosgene) in 9 ml CH2Cl2 is added at +5° C. The mixture is stirred for 4 hours at +5° C. and then cooled to −78° C. A solution of 1.43 ml (13.0 mmol) TiCl4 in 20 ml CH2Cl2 is added and the mixture is stirred for 2 hours at −40° C. 2.5 g (12.9 mmol) 3,4-dichlorobenzal-dehyde in 7 ml CH2Cl2 is added dropwise and the mixture is stirred for 17 h at room temperature. The mixture is hydrolysed with 7 ml HCl 5N, stirred 30 minutes at room temperature and washed with water. After evaporation the residue is submitted to flash-chromatography (ethyl acetate 6,hexanes 4) to give the 2-(3,4-dichloro-phenyl)-2-hydroxy-N-[2-(3-methoxy-4-pent-2-ynyloxy-phenyl)-ethyl]-acetamide.

1. stirringthe mixture is stirred for 2 hours at −40° C
2. stirringthe mixture is stirred for 17 h at room temperature
3. stirringstirred 30 minutes at room temperature
4. washwashed with water
5. customAfter evaporation the residue