Formal [4 + 2] cycloaddition of alkoxy-substituted donor-acceptor cyclobutanes and aldehydes catalyzed by Yb(OTf)3.
作者： Mahmoud M. Abd Rabo Moustafa , Andrew C. Stevens , Ben P. Machin , Brian L. Pagenkopf
DOI: 10.1021/OL102063F
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摘要: The cycloaddition between 2-alkoxy-1,1-cyclobutane diesters and aromatic, heteroaromatic, or aliphatic aldehydes under Yb(OTf)3 catalysis generates tetrahydropyrans in high yields with exclusive cis-stereochemistry.
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