反应详情

p-Toluenesulfonic acid monohydrate (103.0 mg, 0.54 mmol) was added to a solution of 2,5-bis[(tetrahydropyran-2-yl)oxymethyl]benzoic acid (1.62 g, 4.64 mmol) obtained from Example 1-(3) in methanol (30 ml), and the mixture was stirred at room temperature for 2 hours. The resulting solution was concentrated under reduced pressure to afford a solid residue. This residue was subjected to chromatography on a silica gel (50 g) column (eluent; ethyl acetate:hexane=1:1˜1:0) to give the title compound (587.5 mg, 77% yield) as a colorless solid (mp. 107-108° C.).

1. concentrationThe resulting solution was concentrated under reduced pressure
2. customto afford a solid residue