Thiazole → Methyl 3-[(dipropylamino)carbonyl]-5-(1,3-thiazol-2-yl)benzoate

Temperatur

0 °C

To a −78° C. solution of thiazole (1.2 g) in THF (25 mL) was added n-butyl lithium (1.6 M in hexanes, 10 mL). The mixture was stirred for 30 min and then allowed to warm to 0° C. in an ice/water bath. Zinc chloride (1M in ethyl ether, 40 mL) was added and the mixture was stirred for 1 h, at which time methyl 3-[(dipropylamino)carbonyl]-5-iodobenzoate (5.1 g) in THF (20 mL) was added, followed by Pd(PPh3)4 (palladium tetrakis triphenylphosphine) (0.68 g). The mixture was then heated at 80° C. for 2 h, at which time it was allowed to cool and partitioned between ethyl acetate and water. The organic layers were washed with brine, dried (magnesium sulfate), and concentrated. The residue was chromatographed on silica gel using ethyl acetate/heptane (50/50) to give 4.5 g of methyl 3-[(dipropylamino)carbonyl]-5-(1,3-thiazol-2-yl)benzoate.

1. additionwas added
2. temperatureThe mixture was then heated at 80° C. for 2 h, at which time it
3. temperatureto cool
4. custompartitioned between ethyl acetate and water
5. washThe organic layers were washed with brine
6. dry with materialdried (magnesium sulfate)
7. concentrationconcentrated
8. customThe residue was chromatographed on silica gel

ORD-Eintrag

ord-8c15277c81ef4130b983117271cafa80

Quelldatensatz

uspto-grants-2010_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07727997B2