Thiazole → HCID 67258520, Verbindung

Thiazole (21.3 g, 250 mmol) in THF (160 mL) was cooled to −70° C. and then n-BuLi (100 mL, 250 mmol) was added slowly over 5 minutes, keeping the temperature at −60° C. or lower. The resulting slurry was stirred for 45 minutes at this temperature and then the product of Step 1 (48.55 g, 228 mmol) in THF (50 mL) was added dropwise, maintaining the temperature at −60° C. The solution was stirred for one hour and then the cooling bath removed. At −20° C., 2M HCl (114 mL) was added and upon warming to RT the homogeneous solution was diluted with EtOAc (150 mL). The phases were separated and the aqueous layer was extracted with EtOAc (150 mL). The combined organic layers were washed with aqueous saturated NaHCO3 (150 mL), brine (150 mL) and then concentrated to a thick syrup. This was dissolved in EtOAc (140 mL) and then treated with hexane (210 mL) and the slurry filtered to afford tert-butyl 4-hydroxy-4-(1,3-thiazol-2-yl)azepane-1-carboxylate as a white solid (68.0 g, 220 mmol) and the material was then subjected to chiral chromatography to afford tert-butyl (4R)-4-hydroxy-4-(1,3-thiazol-2-yl)azepane-1-carboxylate (14.5 g, 48.6 mmol).

1. customat −60° C.
2. stirringThe solution was stirred for one hour
3. customthe cooling bath removed
4. additionAt −20° C., 2M HCl (114 mL) was added
5. temperatureupon warming to RT the homogeneous solution
6. additionwas diluted with EtOAc (150 mL)
7. customThe phases were separated
8. extractionthe aqueous layer was extracted with EtOAc (150 mL)
9. washThe combined organic layers were washed with aqueous saturated NaHCO3 (150 mL), brine (150 mL)
10. concentrationconcentrated to a thick syrup
11. dissolutionThis was dissolved in EtOAc (140 mL)
12. additiontreated with hexane (210 mL)
13. filtrationthe slurry filtered

ORD-Eintrag

ord-685f1a01ce5b45249d581516ead790a1

Quelldatensatz

uspto-grants-2014_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08759366B2