Stereo- and regioselective photocycloaddition of coumarin and thymine derivatives using molecular recognition catalyst

摘要

The photocycloaddition of coumarin and thymine derivatives in the presence of molecular recognition catalyst in acetonitrile solution afforded two crossadducts cis-syn and cis-anti. Remarkably, the ratio of cis-syn and cis-anti crossadducts was greater by a factor of 12.5 than that of the adducts formed in the reaction using 18-crown-6-ether as the catalyst.