Acetylacetone → 1-(2-Methyl-4-thiophen-2-yl-5,6,7,8-tetrahydro-benzo[4,5]thieno[2,3-b]pyridin-3-yl)-ethanone

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 50 mg (0.19 mmol) (2-amino-4,5,6,7-tetrahydro-benzo[b]thiophen-3-yl)-thiophen-2-yl-methanone (the preparation of which is described in example 6) in 1.5 ml acetic acid was added 0.020 ml (0.21 mmol) of pentane-2,4-dione and one drop of sulfuric acid. The mixture was then stirred at 100° C. for 10 minutes in a microwave and then concentrated in vacuo. Flash chromatography (heptane/ethyl acetate 9:1) afforded 46 mg (74%) 1-(2-methyl-4-thiophen-2-yl-5,6,7,8-tetrahydro-benzo[4,5]thieno[2,3-b]pyridin-3-yl)-ethanone as a yellow oil. ES-MS m/e (%): 328 (M+H+, 100).

Provenance & Evidence