Potassium Carbonate → 5-Amino-3,3-dimethyl-6-nitro-1-(pent-2-ynyl)-1,3-dihydro-indol-2-one

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Reaction Steps

Analogously to general procedure (I) N-(3,3-dimethyl-6-nitro-2-oxo-2,3-dihydro-1H-indol-5-yl)-acetamide (4 g) is alkylated using 1-bromo-2-pentyne (3.1 ml; 30.4 mmol) and K2CO3 (4.2 g; 30.4 mmol) at 40° C. for 20 h. After aqueous work-up only a part of the crude material (1 g; 3.04 mmol) is de-acetylated under reflux using DBU (0.9 ml) in MeOH (80 ml). After aqueous work-up the crude 5-amino-3,3-dimethyl-6-nitro-1-(pent-2-ynyl)-1,3-dihydro-indol-2-one (0.87 g) is used without further purification.

Provenance & Evidence