Toluene-4-sulfonic acid 1-methyl-piperidin-3-ylmethyl ester → (4-Isopropyl-piperazin-1-yl)-[1-(1-methyl-piperidin-3-ylmethyl)-1H-indol-5-yl]-methanone

Participants

Reaction Steps

A mixture of 1.06 g (3.9 mmol) (1H-indol-5-yl)-(4-isopropyl-piperazin-1-yl)-methanone (intermediate 1); 0.484 g (4.3 mmol) KOtBu and 1.33 g (4.7 mmol) toluene-4-sulfonic acid 1-methyl-piperidin-3-ylmethyl ester (intermediate 6) in 20 mL THF was shaken at 60° C. for 3 h. After evaporation of all volatiles a mixture ethyl acetate was added and washed with water. The organic phase was dried with MgSO4 and evaporated to dryness. The residue was purified by column chromatography on silica eluting with a solvent mixture formed from DCM, methanol NEt3. The combined product fractions were evaporated to yield 1.44 g (91%) of the title compound as light yellow gum. MS(m/e): 383.5 (MH+).

Provenance & Evidence