Reaction of 4-t-butyldimethylsiloxy-1-be
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Hideharu Iwasaki; Takashi Kume; Yohsuke Yamamoto; Kin-ya Akiba
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Article
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1987
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Elsevier Science
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French
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4-t-Butyldimethylsiloxy-l-benzopyrylium salt (2,) was prepared in situ from chromone (1) and t-butvldimethvlsilvl triflate and the salt reacted with enol silyl ethe?s, ketene silyl acetals and active methylene compounds to afford 2-substituted 4-t-butyldimethylsiloxy-2H-l-benzopyrans (33, in high yi