Abstract
Aluminum-MCM-41 was found to promote the reaction of aldehydes and diazoesters. Thus, the cation-exchange reaction of a mesoporous silica-ammonium composite with Al(III) in water followed by calcinative removal of the organic cations gave the Al-MCM-41 catalyst. Al-MCM-41 catalyzed the reaction of heptanal with ethyl diazoacetate in CH2Cl2 to give β-keto ester 2 in 99% yield. The catalyst was readily recovered by simple filtration and reused three times without any loss of catalytic activity.
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