Formal [4 + 2] Cycloaddition of Alkoxy-Substituted Donor−Acceptor Cyclobutanes and Aldehydes Catalyzed by Yb(OTf)<sub>3</sub>
作者:Mahmoud M. Abd Rabo Moustafa、Andrew C. Stevens、Ben P. Machin、Brian L. Pagenkopf
DOI:10.1021/ol102063f
日期:2010.11.5
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.