Phthalic Anhydride → HCID 66731461, compound

Temperature

-78 °C

A dry 250 mL RBF under nitrogen was charged with THF (35.3 mL, 0.4 M), and cooled to −78° C., via dry ice bath in acetone. n-Butyllithium (6.3 mL, 15.8 mmol) was added via syringe. While keeping reaction mixture at −78° C., 4-methylthiazole (1.4 g, 15.1 mmol) in 40 mL of THF was added via addition funnel over 15 minutes. The reaction mixture was stirred at −78° C. for 2 hrs, allowed to warm up to 0° C. over half an hour, then cooled back to −78° C. and isobenzofuran-1,3-dione (3.4 g, 22.7 mmol) in 25 ml of THF rapidly added. The reaction was allowed to warm up to RT and stirred overnight. Reaction mixture was concentrated down to 30 mL, diluted with 60 mL of water, cooled to 0° C. and acidified with 6N HCl to pH4, and extracted with DCM (3×100 mL). The organic layers were combined, dried over sodium sulfate and concentrated to dryness under reduced pressure. The resulting residue was triturated with DCM to afford 2-(4-methylthiazole-2-carbonyl)benzoic acid. MS m/z=248 [M+H]+. Calc'd for C12H9NO3S: 247.3.

1. customreaction mixture at −78° C.
2. temperatureto warm up to 0° C. over half an hour
3. temperaturecooled back to −78° C.
4. temperatureto warm up to RT
5. stirringstirred overnight
6. customReaction mixture
7. concentrationwas concentrated down to 30 mL
8. additiondiluted with 60 mL of water
9. temperaturecooled to 0° C.
10. extractionextracted with DCM (3×100 mL)
11. dry with materialdried over sodium sulfate
12. concentrationconcentrated to dryness under reduced pressure
13. customThe resulting residue was triturated with DCM

ORD record

ord-c31c315b03bd4785bfc97f749259fd0f

Source dataset

uspto-grants-2011_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08022221B2