Water → 5-Methyl-4,5-dihydro-thieno[2,3-c]-pyridine

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Reaction Steps

A solution of 6.6 g (33.1 mmol) N-(1-methyl-2-thiphen-2-yl-ethyl)-formamide in 200 ml acetonitrile is cooled in the ice bath and slowly combined with a solution of 6.1 ml (66.3 mmol) phosphorus oxychloride in 50 ml acetonitrile. The mixture is first of all stirred for a further three hours in the ice bath and then for 16 hours at RT. Then it is poured onto 200 ml of water, made alkaline with 9 g of solid sodium hydroxide and extracted three times with ethyl acetate. The combined organic phases are combined with activated charcoal and sodium sulphate, filtered and evaporated down i. vac.

Provenance & Evidence