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Procedure for the Preparation of (1
R
,3
R
,4
R
,5
R
,7
R
)-7-Benzyloxymethyl-4-methyl-2,6-dioxa-5,1-bicyclo[3.2.1]oct-3-yl-methoxytriisopropylsilane (
15): To a stirred solution of 13 (12 mg, 0.023 mmol) in 1.5 mL THF cooled to -78 °C was added dropwise KHMDS (0.52 µL of 0.5 M solution in hexane, 0.026 mmol). After stirring at this temperature for 2 h, 0.6 mL sat. NH4Cl solution was added and the mixture was allowed to warm to r.t. The product was then extracted with Et2O, and the organic layer washed with brine and dried. The solvent was removed on a rotary evaporator, and the residue was flash-chromatographed (pentane-methyl-tert-butylether, 3:1) to give 7 mg of 15 (93%) as a colorless oil. Analytical data for 15: 1H NMR (400 MHz, CDCl3): δ = 7.38-7.26 (m, 5 H, H-11), 4.65-4.57 (m, 2 H, H-10), 4.36-4.34 (m, 1 H, H-7), 4.22 (d, J = 6.5 Hz, 1 H, H-5), 4.08 (dt, J = 2.3, 6.5 Hz, 1 H, H-8), 3.84-3.76 (m, 2 H, H-9), 3.71 (dq, J = 3.2, 11 Hz, 2 H, H-1), 3.47 (dt, J = 3.2, 7.1 Hz, 1 H, H-2), 1.99-1.94 (m, 1 H, H-6), 1.81 (dd, J = 1.5, 11.5 Hz, 1 H, H-6), 1.76-1.68 (m, 1 H, H-3), 1.05 (s, 21 H, H-12), 0.94 (d, J = 6.7 Hz, 3 H, H-4). 13C NMR (100 MHz, CDCl3): δ = 138.34 (s, C-11), 128.32 (d, C-11), 127.69 (d, C-11), 81.71 (d, C-8), 79.52 (d, C-5), 79.16 (d, C-2), 74.52 (d, C-7), 73.27 (t, C-10), 68.39 (t, C-9), 65.22 (t, C-10), 38.15 (t, C-6), 37.00 (d, C-3), 17.99 (dq, C-12), 16.04 (q, C-4), 12.02 (dq, C-12). IR (neat): 2927, 2866, 1496, 1463, 1380, 1258, 1129, 1100, 1066, 1017, 883, 661 cm-1. MS (CI): m/z = 435.1 (100) [M + H]+, 391.2 (89), 357.2 (7), 309.2 (10), 261.2 (50), 243.2 (10), 191.1 (6), 119.1 (10), 91.1 (28). HRMS: m/z calcd for C25H42O4Si [M]+: 434.2852. Found: 434.2853.
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