Scheme 2.
Triflation of chromanone 11 yields unexpected cyclopentyl‐chromene 12, which is also found in ganocin B (3). TMSCl=trimethylsilyl chloride, NaHMDS=sodium bis(trimethylsilyl)amide, 9‐BBN=9‐borabicyclo[3.3.1]nonane.
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