Size Does Matter. Sterically Demanding Metallocene-Substituted 3-Methylidene-Oxindoles Exhibit Poor Kinase Inhibitory Action
作者:John Spencer、Jahangir Amin、Peter Coxhead、John McGeehan、Christopher J. Richards、Graham J. Tizzard、Simon J. Coles、John P. Bingham、John A. Hartley、Li Feng、Eric Meggers、Matthew Guille
DOI:10.1021/om200278j
日期:2011.6.13
1,3-Dihydro-2H-indol-2-one (1) undergoes microwave-mediated Knoevenagel condensations with 1,2,3,4,5-pentaphenylferrocene carboxaldehyde (2b) or (eta(4)-tetraphenyl-cyclobutadiene)(eta(5)-cyclopentadienylcarboxaldehyde)cobalt (2c) to afford metallocene-substituted 3-methylidene-1,3-dihydro-2H-indol-2-one 4 or 5, respectively, in excellent yields as separable E,Z-sfereoisomeric mixtures. Both 4 and 5 exhibited poor kinase inhibition and no appreciable cytotoxicity toward a leukemia cell line, attributed to the steric bulk of the metallocene substituents.