[CH3:1][CH:2]([N:10]1[C:18](=[O:19])[C:17]2[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=2)[C:11]1=[O:20])[CH:3](OS(C)(=O)=O)[CH3:4].[Cl:21][C:22]1[CH:23]=[C:24]([C:28]#[N:29])[NH:25][C:26]=1[CH3:27].C([O-])([O-])=O.[K+].[K+]>CN(C=O)C.CCOCC>[Cl:21][C:22]1[CH:23]=[C:24]([C:28]#[N:29])[N:25]([CH2:4][CH2:3][CH:2]([N:10]2[C:18](=[O:19])[C:17]3[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=3)[C:11]2=[O:20])[CH3:1])[C:26]=1[CH3:27]
A solution of 4.23 g (14.2 mmol) of 2-[1-methyl-2-[(methylsulfonyl)oxy]propyl]-1H-isoindole-1,3(2H)-dione, 2.05 g (14.2 mmol) of 4-chloro-5-methyl-1H-pyrrole-2-carbonitrile and 2.35 g (14.2 mmol) of K2CO3 in 60 mL DMF was heated at 60° C. overnight. The mixture was diluted with ether and washed 4 times with water. Drying (MgSO4) and removal of solvent gave an oil which was chromatographed on silica gel (15% ethyl acetate in hexanes) to give 3.2 g of 4-chloro-1-[3-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)butyl]-5-methyl-1H-pyrrole-2-carbonitrile as a solid, 1NMR (CDCl3) δ1.5 (d, 3H), 2.2 (s, 3H and m, 1H), 2.7 (m, 1H), 3.9 (m, 1H), 4.05 (m, 1H), 4.4 (m, 1H), 6.6 (s, 1H), 7.85 (m, 2H), 7.9 (m, 2H).
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