[CH3:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[CH2:4][CH2:5][C:6]2=O.[NH:12]1[C:20]2[C:15](=[CH:16][CH:17]=[CH:18][CH:19]=2)[CH2:14][C:13]1=[O:21].N1CCCCC1.Cl>CN(C)C=O>[CH3:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[CH2:4][CH2:5][C:6]2=[C:14]1[C:15]2[C:20](=[CH:19][CH:18]=[CH:17][CH:16]=2)[NH:12][C:13]1=[O:21]A mixture of 0.5 g 4-methyl-1-indanone, 1.37 g oxindole and 3 ml piperidine in 5 ml dimethylforamide was heated in a sealed tube at 130° C. for 3 days to yield a reddish-black suspension. The mixture was added to 1N hydrochloric acid solution and extracted with ethyl acetate. The organic layer was washed with brine dried over magnesium sulfate and concentrated. The resulting solid was precipitated from ethyl acetate/hexanes (2×) followed by methylene chloride/hexanes to afford 400 mg of 3-(4-methyl-indan-1-ylidene)-1,3-dihydroindol-2-one as a yellow solid.
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