Ethyl benzoylacetate → Ethyl 2-amino-4-phenyl-1,3-thiazole-5-carboxylate

Temperatur

65 °C

To a solution of ethyl 3-phenyl-3-oxopropionate (5.0 g, 26.0 mmol) in 100 mL of acetonitrile was added hydroxy(tosyloxy)iodobenzene (11.2 g, 28.6 mmol). The resulting suspension was stirred at 65° C. for 1 h at which time the reaction was a homogeneous solution. Thiourea (2.2 g, 28.6 mmol) was added and stirring was continued at 65° C. for 2 h. The mixture was cooled and concentrated, and the residue was taken up in ethyl acetate, washed with saturated aq Na2CO3 and brine, dried (MgSO4) and concentrated. The residue was triturated with ethyl ether to afford 4.9 g (70%) of the title compound as a yellow solid. 1H NMR (CDCl3) d 7.65 (m, 2H), 7.39 (m, 3H), 5.98 (broad s, 2H), 4.18 (q, 2H), 1.22 (t, 3H).

1. stirringstirring
2. waitwas continued at 65° C. for 2 h
3. temperatureThe mixture was cooled
4. concentrationconcentrated
5. washwashed with saturated aq Na2CO3 and brine
6. dry with materialdried (MgSO4)
7. concentrationconcentrated
8. customThe residue was triturated with ethyl ether

ORD-Eintrag

ord-0f7ec75b59b14721884206e1f615b0c5

Quelldatensatz

uspto-grants-2003_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06602895B2