To (2S,3R,4R,5S,6R)-2-(4-chloro-3-(4-hydroxybenzyl)phenyl)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol (intermediate D1) (30 mg) in anhydrous DMF were added 2-(cyclohex-2-enyloxy)ethyl 4-methylbenzenesulfonate (intermediate BV) (1.5 eq) and Cs2CO3 (2 eq). The mixture was stirred at room temperature for 16 h, after which LC-MS showed the reaction was complete. The reaction mixture was poured into water, extracted with EA, washed with water and brine, and then dried with anhydrous Na2SO4 and concentrated to an oil. The crude oil was purified by preparative-HPLC to obtain compound BW (17.1 mg). 1H NMR (CD3OD, 400 MHz): δ 7.32 (m, 3H), 7.11 (d, J=8.8 Hz, 2H), 6.86 (d, J=8.8 Hz, 2H), 5.87˜5.76 (s, 2H), 4.59 (s, 1H), 4.11˜3.89 (m, 6H), 3.89˜3.76 (m, 3H), 3.72˜3.68 (m, 1H), 3.49˜3.40 (m, 3H), 2.03˜1.98 (m, 2H), 1.89˜1.84 (m, 1H), 1.80˜1.62 (m, 2H), 1.79˜1.51 (m, 1H); MS ESI (m/z) 506 (M+H)+, calc. 505.
