1,3,3-Trimethyl-2-methyleneindoline → HCID 19388550, compound

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A solution of 4-(p-diethylaminophenyl)-1-nitroso-2 -hydroxynaphthalene (0.85 g; 0.0027 mol) and 1,3-dihydro-1,3,3-trimethyl-2-methyleneindoline (0.5 g; 0.0029 mol) in methanol (60 ml) under nitrogen, was heated under reflux for 24 hours. The solution was then evaporated and chromatographed over silica (1 part diethyl ether to 10 parts pet. ether) to afford 1,3-dihydro-1,3,3-trimethyl-6'-(p-diethylaminophenyl)spiro[2H-indole-2,3'-[3H]naphth[2,1-b][1,4]oxazine] (0.47 g; 36%) as a yellow solid.

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