5,6-Dimethoxyindoline → 5,6-dimethoxy-1-(2-(4-nitro-1H-pyrazol-1-yl)ethyl)indoline

Participants

Reaction Steps

To a solution of 2-(4-nitro-1H-pyrazol-1-yl)acetaldehyde (942 mg, 6.08 mmol) in DCM (60.0 mL), 5,6-dimethoxyindoline (from step 1) (1.09 g, 6.08 mmol) and STAB (1.55 g, 7.29 mmol) was added. After stirring at rt for 1 h, the reaction mixture was quenched with water and extracted with DCM (2×). The combined org. layers were concentrated and purification was performed by FC (EtOAc/hex 1:4 to 1:1) to yield 5,6-dimethoxy-1-(2-(4-nitro-1H-pyrazol-1-yl)ethyl)indoline as a brown solid. LC-MS conditions B: tR=0.65 min, [M+H]+=319.19.

Provenance & Evidence