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Experimental procedure for Table 3, entry 5: Octyl β-D- glucopyranoside (58.5 mg, 0.20 mmol, 1 (1.7 mg, 2.0 μmol, and 2,4,6-collidine (40 μL, 0.30 mmol) were dissolved in CHCl3 (2.0 mL) at 20°C. After the solution was cooled at -20°C, isobutyric anhydride (36 μL, 0.22 mmol) was added. The resulting mixture was stirred at -20°C for 24 h. The reaction mixture was quenched with saturated aqueous NH4Cl solution and extracted with ethyl acetate. The organic layer was washed with H2O and brine, dried over MgSO4, filtered, and concentrated in vacuo. The residue was purified by SiO2 column chromatography (ethyl acetate/hexane, 30:70 to 100:0) to give a 99:1 mixture of octyl 4-O-isobutyryl-β-D-glucopyranoside and octyl 3-O-isobutyryl-β-D-glucopyranoside in a combined yield of 98, 71 mg, Identification of the regioisomeric products was unambiguously perf
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2 column chromatography (ethyl acetate/hexane = 30:70 to 100:0) to give a 99:1 mixture of octyl 4-O-isobutyryl-β-D-glucopyranoside and octyl 3-O-isobutyryl-β-D-glucopyranoside in a combined yield of 98% (71 mg). Identification of the regioisomeric products was unambiguously performed by the comparison with pure regioisomers prepared independently by a conventional protection/deprotection procedure (see Supporting Information).
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