N,N'-Dimethylethylenediamine → HCID 69359054, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of ethyl 3-ethyl-7-iodo-1H-indole-5-carboxylate (D190) (1 g, 2.91 mmol, 1 equiv) in toluene (10 ml) were added 2-piperidinone (346 mg, 3.50 mmol, 1.2 equiv), K3PO4 (1.24 g, 5.83 mmol, 2 equiv), CuI (56 mg, 0.29 mmol, 0.1 equiv) and dimethyl ethylene diamine (62 μl, 0.58 mmol, 0.2 equiv) and the resulting mixture was stirred at 100° C. for 15 h then cooled to room temperature and concentrated in vacuo. The residue was partitioned between AcOEt and H2O and the layers were separated. The organic phase was dried under MgSO4 and concentrated in vacuo. Purification of the residue by flash chromatography on silica gel (AcOEt/iso-hexane: 1/0) gave ethyl 3-ethyl-7-(2-oxo-1-piperidinyl)-1H-indole-5-carboxylate (B165) (250 mg, 27%) as an off-white solid. [M+H]+=315.4, RT=2.98 min.

Provenance & Evidence