[CH2:1]([C:3]1[CH:11]=[CH:10][C:6]([C:7]([OH:9])=O)=[CH:5][CH:4]=1)[CH3:2].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[NH2:31][C:32]([CH3:36])([CH3:35])[CH2:33]O.C(N(CC)CC)C>C(#N)C.CCCCCC.C(OCC)(=O)C.ClC(Cl)(Cl)Cl>[CH2:1]([C:3]1[CH:4]=[CH:5][C:6]([C:7]2[O:9][CH2:33][C:32]([CH3:36])([CH3:35])[N:31]=2)=[CH:10][CH:11]=1)[CH3:2]
To a solution of 4-ethylbenzoic acid (3.80 g) in anhydrous acetonitrile (100 mL) was added under a nitrogen atmosphere, triphenylphosphine (20 g), 2-amino-2-methyl-1-propanol (2.74 mL) and triethylamine (28.2 mL). The mixture was cooled on an ice bath and then tetrachloromethane (5.36 mL) was added. The reaction mixture was allowed to stand at room temperature and stirred for 18 hours. To the reaction mixture was added ethyl acetate and hexane and the precipitate was removed by filtration. The concentration of the filtrate left a residue, which was purified by column chromatography on silica gel (hexane/ethyl acetate/=9/1/ to 6/1) to give the subject compound (1.15 g).
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