[OH:1][C:2]1[CH:10]=[CH:9][C:8]2[N:7]([CH3:11])[C:6]3[C:12](=O)[CH2:13][CH2:14][C:5]=3[C:4]=2[CH:3]=1.[NH2:16][CH2:17][CH2:18][N:19]1[CH2:24][CH2:23][O:22][CH2:21][CH2:20]1>C(#N)C.CC(C)[O-].[Ti+4].CC(C)[O-].CC(C)[O-].CC(C)[O-]>[CH3:11][N:7]1[C:8]2[CH:9]=[CH:10][C:2]([OH:1])=[CH:3][C:4]=2[C:5]2[CH2:14][CH2:13][C:12](=[N:16][CH2:17][CH2:18][N:19]3[CH2:24][CH2:23][O:22][CH2:21][CH2:20]3)[C:6]1=2To a stirred solution of 7-hydroxy-4-methyl-1,4-dihydrocyclopent[b]indol-3-one (8.00 g) in acetonitrile (125 ml) under nitrogen were added 4-(2-aminoethyl)morpholine (10.35 g) and titanium isopropoxide (22.60 g). The reaction was monitored by TLC and after two hours additional equivalents of 4-(2-aminoethyl)morpholine (5.17 g) and titanium isopropoxide (11.30 g) were added. Fourteen hours later the reaction was quenched with water (200 ml). EtOAc (200 ml) was added and the mixture stirred for fifteen minutes and filtered. The layers were separated, the aqueous layer was extracted with ethyl acetate, and the combined organics were dried (Na2SO4) and concentrated in vacuo. The resulting yellow solid was dried yielding 6.65 g. of product. A 2 g sample of the solid was further purified by crystallization from CH2Cl2 /hexane to afford 1.2 g of 4-methyl-3-[2-(4-morpholinyl)ethyl]imino-1,2,3,4-tetrahydrocyclopent[b]indol-7-ol.
Loading…
