Reaction Steps
General procedure A using using methyl 3,4-di-O-benzyl-6-O-(tert-butyldiphenylsilyl)-β-D-glucopyranoside (0.124 g, 0.202 mmol), NaH (15 mg, 0.303 mmol, 60% in mineral oil) and 4-chlorobenzylchloride (34.2 mg, 0.212 mmol) and gave 72 mg (48%) of 23 as a colorless oil after purification by flash column chromatography on silica gel (10% EtOAc/Hexanes). [α]24D: +6.9° (c 1.16, CH2Cl2); IR (thin film) 2929, 1492, 1428, 1072 cm−1; 1H-NMR (CDCl3) δ 7.82 (dd, J=1.5, 7.9 Hz, 2H), 7.76 (dd, J=1.2, 7.9 Hz, 2H), 7.49-7.31 (m, 18H), 7.27-7.24 (m, 2H), 4.97-4.88 (m, 4H), 4.76 (d, J=10.7 Hz, 1H), 4.75 (d, J=11.3 Hz, 1H), 4.37 (d, J=7.6 Hz, 1H), 3.99 (s, 2H), 3.83 (dd, J=9.2, 9.5 Hz, 1H), 3.71 (dd, J=9.2, 9.2 Hz, 1H), 3.64 (s, 3H), 3.49 (dd, J=7.9, 8.8 Hz, 1H), 3.41-3.39 (m, 1H), 1.12 (s, 9H); 13C-NMR (CDCl3) δ 138.7, 138.4, 137.4, 136.1, 135.8, 135.0, 133.8, 133.5, 133.3, 129.8, 129.5, 128.7, 128.6, 128.1, 128.0, 127.9, 127.8, 104.6, 84.8, 82.7, 77.9, 76.1, 75.8, 75.4, 74.1, 62.8, 56.9, 27.0, 26.8, 19.5; FAB MS m/z (M)+: calcd 759.2885, obsd 759.2881.
