Abstract
A facile one-pot synthesis of 3-(2-hydroxyphenyl)indolin-2-ones has been developed via the TiCl 4-mediated Baylis–Hillman (B–H) reaction of N-substituted isatins and cyclohex-2-enone, followed by treatment of the in situ generated B–H alcohols with aq HBr. Baylis–Hillman reaction of aromatic cyclic 1,2-diones with cycloalk-2-enones under the influence of TiCl 4 has been successfully performed and the resulting Baylis–Hillman adducts have been conveniently transformed into pentacyclic and hexacyclic fused furan derivatives.
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