drop of trifluoromethanesulfonic acid. After 25 min at 0 °C, the reaction mixture was poured into saturated sodium bicarbonate solution and extracted with dichloromethane. The combined extracts were washed with saturated sodium bicarbonate solution and water prior to drying and careful solvent removal at 0-10 °C. Column chromatography of the residue on silica gel (elution with 5% ethyl acetate in petroleum ether) gave an alcohol presumed to be 15 (3-7 mg) as a white solid: mp (unrecrystallized) [120][121][122][123][124] °C; IR (CC14, cm"1) 3620,2930,1470; NMR (CDC13,300 MHz)5.3 (br s, 1 ), 2.1-1.0 (series of m with clear triplet at 1.05 (J
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