Dimethylformamide → 5-tert-Butyl 2-ethyl 6,7-dihydrothieno[3,2-c]pyridine-2,5(4H)-dicarboxylate

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Reaction Steps

5-tert-butyl 2-ethyl 6,7-dihydrothieno[3,2-c]pyridine-2,5(4H)-dicarboxylate was prepared according to the procedure as outlined in Example 1, (Step 1). Starting from tert-butyl-1-piperidinecarboxylate (9.9 g, 50 mmol), POCl3 (6.3 g, 40 mmol) and DMF (3.8 g, 50 mmol). The chloroformyl intermediate was reacted with ethyl mercaptoacetate (6.0 g, 50 mmol) and Et3N. The product was purified by SiO2 column chromatography by eluting it with 3:1 hexane; ethylacetae. Yield: 8.7 g, 56%; White liquid. (M+H) 312.

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