Studies on Tumor Promoters. 11. A New Cycloaddition Method and Its Application to the Synthesis of BC Ring Precursors of Phoboids

Article abstract of DOI:10.1021/jo00022a009

A new method for the generation of oxidopyrylium zwitterions has been developed that allows for its use in the <5+2> cycloaddition of substrates incorporating thermally unstable functionalities, providing for the synthesis of previously inaccessible precu