Hydrochloric Acid → HCID 178470750, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of sodium ethoxide 21% in ethanol (1.8 mL; 4.8 mmol) in dry ethanol (30 mL) under a nitrogen atmosphere was added (2-amino-4,5,6,7-tetrahydrobenzo[b]thiophen-3-yl)(p-tolyl)methanone (1.09 g; 4 mmol) and diethyl succinate (0.929 mL; 5.6 mmol). The mixture was heated to 100° C. for 24 h. The reaction mixture was dissolved with water (8 ml) and acidified with a solution of hydrochloric acid 1N to pH 1 and the aqueous layer was extracted with ethyl acetate. The organics were combined, dried over sodium sulphate and concentrated under reduced pressure. The crude was suspended in dry ethanol (30 mL) and a catalytic amount of concentrated sulfuric acid (10 drops) was carefully added. The reaction mixture was heated to reflux for 21 h. The volatiles were removed under reduced pressure and the remaining residue was purified by flash-chromatography on silica gel using a gradient of methanol (1-20%) in ethyl acetate as eluent to furnish 0.358 g (19.6%) of ethyl[2-hydroxy-4-(p-tolyl)-5,6,7,8-tetrahydro[1]benzothieno[2,3-b]pyridin-3-yl]acetate as an ochre solid. ESI/APCI(+): 382 (M+H).

Provenance & Evidence