Titanium tetraisopropoxide promoted reactions for the synthesis of substituted coumarins
2010
Substituted coumarins are synthesized by the reaction of salicylaldehyde derivatives with malonitrile, isopropyl cyanoacetate or diisopropyl malonate promoted by Ti(O-i-Pr) 4 . When i-PrOH is used as a solvent, these reactions proceeded by the catalytic amount of Ti(O-i-Pr) 4 (~0.1 equivalent).
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