Phosphorus oxychloride → HCID 59854662, compound

Participants

Reaction Steps

Commercially available ethyl 2-amino-4,5,6,7-tetrahydrobenzo(b)-thiophene-3-carboxylate (6.0 g, 26.6 mmol, 100 mol-%) and N-benzyl-3,4,5-trimethoxybenzamide (10.4 g, 34.6 mmol, 130 mol-%) were dissolved in dry 1,2-dichloroethane. The reaction mixture was cooled with an ice-salt-bath and POCl3 (1.7 ml, 24.6 mmol, 130 mol-%) was added. The reaction mixture was refluxed for 24 hours. During refluxing POCl3 (340 μl) was added twice. The reaction mixture was poured into ice-water and after neutralization with sodium acetate the product was extracted into dichloromethane. The organic phases combined were washed with sodium bicarbonate sat. (3×50 ml) and dried with MgSO4. The yield after recrystallization from i-propanol was 8.3 g (yield 68%).

Provenance & Evidence