反应详情

A solution of 130.15 g of sodium methoxide in 2.4 l methanol is added at room temperature to a solution of 5469 g of ethyl 8-(p-chlorophenylsulfonamido)-4-[3-(3-pyridyl)propyl]-octanoate in 52.3 l of methanol. The mixture is stirred for 40 h under nitrogen. Glacial acetic acid (145.5 g) is added and the reaction mixture is evaporated to dryness at 60° and 3 mm Hg (=4.00 mbar). The residue is dissolved in 40 l of ethyl acetate, the solution is washed with dilute sodium bicarbonate solution and then with 5% sodium bisulfite, dried over sodium sulfate, treated with charcoal and evaporated to dryness to yield crude methyl 8-(p-chlorophenylsulfonamido)-4-[3-(3-pyridyl)propyl]-octanoate (compound of example 4a).

1. customthe reaction mixture is evaporated to dryness at 60°
2. dissolutionThe residue is dissolved in 40 l of ethyl acetate
3. washthe solution is washed with dilute sodium bicarbonate solution
4. dry with materialwith 5% sodium bisulfite, dried over sodium sulfate
5. additiontreated with charcoal
6. customevaporated to dryness