The preparation of 4-substituted pyrylium salts and their use in dienal synthesis
作者:Patchanee Charoenying、Karl Hemming、Darren McKerrecher、Richard J. K. Taylor
DOI:10.1002/jhet.5570330415
日期:1996.7
The unsubstituted pyrylium nucleus is shown to undergo reaction with cuprate or secondary Grignard organometallic reagents to give intermediate 4-substituted pyrans which are converted into the corresponding 4-substituted pyrylium salts (7 examples) in fair to good overall yield. The synthetic utility of the 4-substituted pyrylium heterocycles is demonstrated by their reaction with organolithium reagents