Hydrochloric Acid → HCID 45121755, compound

A 1.0 M diisobutylaluminum hydride/toluene solution (165 ml) was added dropwise to a solution of 25.05 g of 5-ethynyl-4-methoxycarbonylthiazole in 450 ml of toluene under an argon atmosphere at −40° C. The mixture was stirred at the same temperature for one hr. Thereafter, the reaction solution was poured into brine, and 200 ml of 1 N aqueous hydrochloric acid was added thereto. The insolubles were removed by filtration through Celite, and the filtrate was extracted four times with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, was filtered, and was concentrated under the reduced pressure. The residue was dissolved in 300 ml of ethanol and 150 ml of THF. Sodium borohydride (2.2 g) was added to the solution in an argon atmosphere, under ice cooling, and the mixture was stirred at room temperature for one hr. Brine was added to the reaction solution, the mixture was adjusted to pH 3 by the addition of 1 N aqueous hydrochloric acid, and the organic solvent was removed by distillation under the reduced pressure. The residue was extracted three times with ethyl acetate. The extract was dried over anhydrous magnesium sulfate, was filtered, and was concentrated under the reduced pressure. The residue was purified by column chromatography on silica gel (chloroform:ethyl acetate=3:1 to 1:1) to give 19.25 g of 5-ethynyl-4-hydroxymethylthiazole.

1. additionwas added
2. customThe insolubles were removed by filtration through Celite
3. extractionthe filtrate was extracted four times with ethyl acetate
4. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
5. filtrationwas filtered
6. concentrationwas concentrated under the reduced pressure
7. dissolutionThe residue was dissolved in 300 ml of ethanol
8. additionSodium borohydride (2.2 g) was added to the solution in an argon atmosphere, under ice cooling
9. stirringthe mixture was stirred at room temperature for one hr
10. additionBrine was added to the reaction solution
11. additionthe mixture was adjusted to pH 3 by the addition of 1 N aqueous hydrochloric acid
12. customthe organic solvent was removed by distillation under the reduced pressure
13. extractionThe residue was extracted three times with ethyl acetate
14. dry with materialThe extract was dried over anhydrous magnesium sulfate
15. filtrationwas filtered
16. concentrationwas concentrated under the reduced pressure
17. customThe residue was purified by column chromatography on silica gel (chloroform:ethyl acetate=3:1 to 1:1)

ORD record

ord-ac3a08ed2268481dba3b9a9c44767136

Source dataset

uspto-grants-2013_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08344154B2