[CH2:1]([N:9]1[C:13](=[O:14])[CH:12]=[CH:11][C:10]1=[O:15])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH3:8].[CH2:16]([NH2:24])[CH2:17][CH2:18][CH2:19][CH2:20][CH2:21][CH2:22][CH3:23].C(N(CC)CC)C>C(#N)C>[CH2:1]([N:9]1[C:10](=[O:15])[CH2:11][CH:12]([NH:24][CH2:16][CH2:17][CH2:18][CH2:19][CH2:20][CH2:21][CH2:22][CH3:23])[C:13]1=[O:14])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH3:8]A mixture of N-octyl maleimide (0.01 M) prepared as described in Example 10 above, octylamine (0.01 M), triethylamine [catalytic, 0.1 equivalent] in acetonitrile (25 ml) was stirred for 24 hours at room temperature. Acetonitrile was removed under vacuum to leave a residual liquid product which was flash chromatographed (25% ethyl acetate in petroleum ether) to yield a white solid as the desired product.
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