Hydrochloric Acid → Methyl 3-(2-fluorophenyl)-2-(2-(isopropylamino)benzo[d]thiazol-6-yl)-3-oxopropanoate

Participants

Reaction Conditions

Reaction Steps

To a solution of lithium bis(trimethylsilyl)amide (1.0 M in THF, 15.1 mL) in THF (30 mL) was added a solution of methyl 2-(2-(isopropylamino)benzo[d]thiazol-6-yl)acetate (1.60 g, 6.05 mmol) in THF (20 mL) at −78° C. over 40 min. The resulting solution was stirred at −78° C. for 15 min before a solution of methyl 2-fluorobenzoate (1.08 mL, 8.48 mmol) in THF (10 mL) was added over 5 min. The mixture was stirred at −78° C. for 1 hr and then at rt for 3 hr before it was poured into ice-cold water (100 mL). After its pH value was adjusted to 9 with 6 N HCl, the mixture was extracted with AcOEt (3×40 mL). The combined extract was washed with brine and dried over anhydrous MgSO4. Evaporation of solvent under vacuum give the title compound (2.81 g) as an orange yellowish oil. This product was 63% pure by LCMS, but it was used in the next step without further purification.

Provenance & Evidence