反应详情

A solution of ethyl 2-isopropylthiazole-5-carboxylate (example 55, step a) (0.33 g) in methanol (6 mL) was treated with a solution of lithium hydroxide (0.079 g) in water (3 mL) and the resultant mixture stirred for 2 hours at 20° C. The methanol was evaporated off under reduced pressure and the residue partitioned between ether and brine. The aqueous layer was acidified by dropwise addition of dilute hydrochloric acid and the mixture extracted with ethyl acetate. The organic layer was washed with brine, dried over sodium sulphate, filtered and the solvent evaporated under reduced pressure to afford the subtitled compound. Yield 0.185 g.

1. customThe methanol was evaporated off under reduced pressure
2. customthe residue partitioned between ether and brine
3. additionThe aqueous layer was acidified by dropwise addition of dilute hydrochloric acid
4. extractionthe mixture extracted with ethyl acetate
5. washThe organic layer was washed with brine
6. dry with materialdried over sodium sulphate
7. filtrationfiltered
8. customthe solvent evaporated under reduced pressure