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77949909293
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Note
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General Experimental Procedure Typically, H2SO4 (0.3 equiv, 16 ?L) was added to the mixture of D-glucal (1 mmol, 272 mg), 4 ? MS (272 mg) and alcohol (1.5 equiv) in CH2Cl2, and the reaction mixture was stirred for 5 min at r.t. After the reaction was completed, the reaction mixture was filtered and washed with CH2Cl2. The combined organic layer was washed with sat. NaHCO3 solution (10 mL) and sat. brine (10 mL), and then dried over anhyd Na2SO4. After evaporation of the solvent under reduced pressure, the crude products were purified by silica gel column chromatography (PE?EtOAc = 10:1). (34)
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Selected Spectral Data n-Pentyl 4,6-Di-O-acetyl-2,3-dideoxy-a-D-erythro- hex-2- enopyranoside (5b) 1H NMR (500 MHz, CDCl3): δ= 0.91 (t, J = 6.7 Hz, 3 H), 1.34?1.37 (m, 4 H), 1.59?1.63 (m, 2 H), 2.07?2.10 (m, 6 H), 3.48?3.53 (m, 1 H), 3.75?3.80 (m, 1 H), 4.09?4.27 (m, 3 H, H-5, H-6a, H-6b), 5.03 (s, 1 H, H-1), 5.30?5.32 (dd, 1 H, J = 9.6 Hz, H-4), 5.83?5.89 (m, 2 H, H-2, H-3) ppm. 13C NMR (125 MHz, CDCl3): δ= 13.94, 20.69, 20.88, 22.40, 28.31, 29.32, 62.99, 65.27, 66.81, 68.87, 94.31, 127.92, 128.89, 170.22, 170.71 ppm. ESI-MS: m/z = 323.10 [M +Na+]. n-Decyl 4,6-Di-O-acetyl-2,3-dideoxy-a-D-erythro-hex-2- enopyranoside (6b) 1H NMR (500 MHz, CDCl3): δ= 0.86 (t, 3 H), 1.26?1.35 (m, 16 H), 2.07?2.09 (m, J = 9.2 Hz, 6 H), 3.49 (m, 1 H), 4.09? 4.26 (m, 3 H, H-5, H-6a, H-6b), 5.01 (s, 1 H, H-1), 5.29?5.32 (dd, J = 1.3, 9.7 Hz, 1 H, H-4), 5.83?5.88 (m, 2 H, H-2, H- 3) ppm. 13C NMR (125 MHz, CDCl3): δ= 14.00, 20.69, 20.87, 22.58, 25.67, 26.16, 29.23, 29.36, 29.47, 31.81, 32.70, 62.92, 64.37, 66.80, 68.94, 94.32, 127.90, 128.88, 170.27, 170.76 ppm. ESI-MS: m/z = 393.20 [M + Na+] 2-Ethylhexyl 4,6-Di-O-acetyl-2,3-dideoxy-a-D-erythrohex- 2-enopyranoside (12b) 1H NMR (500 MHz, CDCl3): δ= 0.86?0.91 (m, 6 H), 1.26? 1.33 (m, 8 H), 1.34?1.42 (m, 1 H), 2.09?2.10 (m, J = 5.7 Hz, 6 H), 3.36?3.38 (q, 1 H), 3.54?3.55 (d, 1 H), 3.70?3.71 (t, 1 H), 4.08?4.25 (m, 3 H, H-5, H-6a, H-6b), 5.00 (s, 1 H, H-1), 5.29?5.31 (dd, J = 9.7 Hz, 1 H, H-4), 5.82?5.94 (m, 2 H, H-2, H-3) ppm. 13C NMR (125 MHz, CDCl3): δ= 11.02, 13.99, 20.67, 20.87, 22.94, 23.68, 28.93, 30.49, 39.57, 63.03, 65.28, 66.87, 72.64, 94.45-94.53, 127.95, 128.74, 170.21, 170.71 ppm. ESI-MS: m/z = 365.14 [M + Na+]. 2-yanoethyl 4,6-Di-O-acetyl-2,3-dideoxy-a-D-erythrohex- 2-enopyranoside (15b) 1H NMR (500 MHz, CDCl3): δ= 2.08?2.10 (m, J = 10.0 Hz, 6 H), 2.64?2.71 (m, 2 H), 3.76?3.97 (m, 2 H), 4.12?4.22 (m, 3 H, H-5, H-6a, H-6b), 5.07 (s, 1 H, H-1), 5.29?5.31 (dd, 1 H, J = 1.0, 9.5 Hz, H-4), 5.81?5.93 (m, 2 H, H-2, H-3) ppm. 13C NMR (125 MHz, CDCl3): δ= 18.96, 20.56, 20 72, 62.69, 63.26, 64.85, 67.14, 94.60, 117.58, 126.70, 129.57, 170.13, 170.59 ppm. ESI-MS: m/z = 306.07 [M + Na+]. Trichloroethyl 4,6-Di-O-acetyl-2,3-dideoxy-a-D- erythrohex- 2-enopyranoside (17b) 1H NMR (500 MHz, CDCl3): δ= 2.07?2.13 (m, J = 10.8 Hz, 6 H), 4.17?4.18 (d, 2 H), 4.27?4.36 (m, 3 H, H-5, H-6a, H- 6b), 5.31 (s, 1 H, H-1), 5.37?5.38 (dd, J = 9.2 Hz, 1 H, H-4), 5.97?6.00 (m, 2 H, H-2, H-3) ppm. 13C NMR (125 MHz, CDCl3): δ= 20.76, 20.87, 62.66, 65.01, 67.49, 76.15, 79.61, 96.37, 126.38, 130.20, 170.39, 170.92 ppm. ESI-MS: m/z = 382.94 [M + Na+].
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