REACTION OF 4-t-BUTYLDIMETHYLSILOXY-1-BENZOPYRYLIUM SALT WITH ENOL SILYL ETHERS AND ACTIVE METHYLENES

Article abstract of DOI:10.1016/S0040-4039(01)91372-3

4-t-Butyldimethylsiloxy-1-benopyrylium salt (2) was prepared in situ from chromone (1) and t-butyldimethylsilyl triflate and the salt reacted with enol silyl ethers, ketene silyl acetals and active methylene compounds to afford 2-substituted 4-t-butyldime