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ORGANIC LETTERS
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.3c00047
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Catalytic CO2 reduction with phenylsilane under solvent-free conditions was utilized to synthesize 3,4-dihydropyrans from beta dicarbonyl compounds and styrenes in a one-pot reaction. The synthesis involves three steps: (1) formation of bis(silyl)acetal from CO2 and phenylsilane, followed by a domino reaction of (2) Knoevenagel condensation and (3) inverse-electron-demand oxa-Diels-Alder reaction. The first step is catalyzed by a pentanuclear ZnII complex (0.07 mol %) to generate bis(silyl)acetals, which are then hydrolyzed into formaldehyde for the second step.
Catalytic CO2 reduction with phenylsilane under solvent-free conditions was linked with the one-pot synthesis of 3,4-dihydropyrans from beta dicarbonyl compounds and styrenes. The synthesis includes three processes: (1) bis(silyl)acetal formation from CO2 and phenylsilane and a domino reaction of (2) Knoevenagel condensation and (3) inverse-electron-demand oxa-Diels-Alder reaction. The first process was catalyzed by a pentanuclear ZnII complex (0.07 mol %) to generate bis(silyl)acetals, which were hydrolyzed into formaldehyde to be used in the second step.
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