반응 #2146752

반응 방정식

(2R,3R,4R,5R)-2,4-dibenzoyloxy-5-benzoyloxymethyl-3-ethynyl-tetrahydro-furan-3-ol

K2CO3

→

(2R,3R,4R,5R)-4-benzoyloxy-5-benzoyloxymethyl-3-ethynyl-tetrahydrofuran-2,3-diol

용매

THF

methanol

반응 조건

후처리

1. 1
   여과filtered on silica gel
2. 2
   농축concentrated
3. 3
   기타purified by flash chromatography

실험 절차

Intermediate (2R,3R,4R,5R)-2,4-dibenzoyloxy-5-benzoyloxymethyl-3-ethynyl-tetrahydro-furan-3-ol (2.048 g, 4.21 mmol, 1.0 equiv.) is dissolved in methanol (10 ml) and THF (10 ml). K2CO3 (176 mg, 1.26 mmol, 0.3 equiv.) is added, The reaction is stirred at ambient temperature for 2 h, filtered on silica gel, concentrated and purified by flash chromatography to give (2R,3R,4R,5R)-4-benzoyloxy-5-benzoyloxymethyl-3-ethynyl-tetrahydrofuran-2,3-diol as a foam. 1H-NMR (400 MHz, CDCl3): δ 8.06-7.96 (m, 4H), 7.54-7.26 (m, 6H), 5.88 (d, 0.26H, J=6.4 Hz), 5.54 (s, 0.72H), 5.53 (d, 0.72H, J=5.2 Hz), 5.41 (s, 0.28H), 5.28 (bs, 1H), 4.67-4.49 (m, 3H), 4.22 (bs, 1H), 2.67 (s, 0.26H), 2.59 (s, 0.71H); 13C-NMR (100 MHz, CDCl3): δ 166.74, 166.61, 165.74, 165.66, 133.79, 133.71, 133.52, 133.33, 133.24, 130.11, 130.05, 130.02, 129.89, 129.81, 129.44, 129.41, 128.86, 128.75, 128.57, 128.41, 128.36, 81.87, 80.07, 79.23, 77.89, 77.21, 76.61, 76.39, 75.77, 75.58, 72.83, 65.29, 64.26.

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