Formaldehyde → 2-(4-chloro-phenyl)-6-[3-methoxy-4-(1-methyl-azetidin-3-yloxy)-phenyl]-6H-thieno[2,3-c]pyridin-7-one

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Reaction Steps

Mix 6-[4-(azetidin-3-yloxy)-3-methoxy-phenyl]-2-(4-chloro-phenyl)-6H-thieno[2,3-c]pyridin-7-one trifluoroacetic acid salt (210 mg, 0.48 mmol) with methanol (10 mL) and acetic acid (0.3 mL). Add a solution of formaldehyde (0.20 mL, 2.66 mmol, 37% aqueous solution) and stir the mixture for 15 min. Add sodium cyanoborohydride (110 mg, 1.75 mmol) and stir the mixture at RT overnight. Concentrate the mixture in vacuo and partition the crude material between saturated NaHCO3 (25 mL) and CH2Cl2 (25 mL). Remove the organic solution and extract the aqueous phase with additional CH2Cl2 (2×25 mL). Combine the organic solutions and concentrate in vacuo. Purify the crude material by flash chromatography, using 5% MeOH (2N NH3) in CH2Cl2 as eluent, to give 133 mg (61%) of 2-(4-chloro-phenyl)-6-[3-methoxy-4-(1-methyl-azetidin-3-yloxy)-phenyl]-6H-thieno[2,3-c]pyridin-7-one as a white solid.

Provenance & Evidence