تفاعل #90567

معادلة التفاعل

317

Allyl (3,4,6-tri-O-acetyl-2-deoxy-2-trichloroacetamido-β-D-glucopyranosyl)-(1→2)-3,4-di-O-benzyl-α-L-rhamnopyranoside

→

318

المردود 83.1%

(3,4,6-tri-O-acetyl-2-deoxy-2-trichloroacetamido-β-D-glucopyranosyl)-(1→2)-3,4-di-O-benzyl-α-L-rhamnopyranose

المردود 83.1%

المذيبات

tetrahydrofuran

tetrahydrofuran

ظروف التفاعل

المعالجة

1. 1
   أخرىthe resulting red solution was degassed in an argon stream
2. 2
   أخرىHydrogen was then bubbled through the solution
3. 3
   أخرىThe solution was then degassed again in an argon stream
4. 4
   workup.ADDITIONadded
5. 5
   تركيزThe mixture was concentrated
6. 6
   workup.ADDITIONwater (3 mL) was added
7. 7
   workup.STIRRINGThe mixture was stirred for 2 h at rt
8. 8
   تركيزconcentrated
9. 9
   غسيلwashed three limes with sat. aq. KI
10. 10
    أخرىThe organic phase was dried
11. 11
    تركيزconcentrated
12. 12
    أخرىThe residue was purified by column chromatography (cyclohexane-EtOAc 4:1)

الإجراء التجريبي

1,5-Cyclooctadiene-bis(methyldiphenylphosphine)iridium hexafluorophosphate (120 mg, 140 μmol) was dissolved tetrahydrofuran (10 mL), and the resulting red solution was degassed in an argon stream. Hydrogen was then bubbled through the solution, causing the colour to change to yellow. The solution was then degassed again in an argon stream. A solution of 317 (1.46 g, 1.75 mmol) in tetrahydrofuran (20 mL) was degassed and added. The mixture was stirred at rt overnight. The mixture was concentrated. The residue was taken up in acetone (27 mL), and water (3 mL) was added. Mercuric bromide (949 mg, 2.63 mmol) and mercuric oxide (761 mg, 3.5 mmol) were added to the mixture, protected from light. The mixture was stirred for 2 h at rt, then concentrated. The residue was taken up in CH2Cl2 and washed three limes with sat. aq. KI, then with brine. The organic phase was dried and concentrated. The residue was purified by column chromatography (cyclohexane-EtOAc 4:1) to give 318 (1.13 g, 81%) as a white foam. [α]D+4° (c 1, CHCl3). 1H NMR: δ 7.35-7.05 (m, 10H, Ph), 6.74 (d, 1H, J2,NH=8.5 Hz, NHD), 5.10 (d, 1H, J1,2=1.1 Hz, H-1A), 5.02 (m, 2H, H-3D, 4D), 4.80-4.50 (m, 4H, CH2Ph), 4.61 (d, 1H, J1,2=8.5 Hz, H-1D), 4.15-4.08 (m, 2H, J5,6=4.5, J6a,6b=12.3 Hz, H-6aD, 6bD), 4.00 (m, 1H, H-2D), 3.90 (dd, 1H, J2,3=3.3, H-2A), 3.86 (dd, 1H, J3,4=9.5 Hz, H-3A), 3.85 (dq, 1H, J4,5=9.5, J5,6=6.2 Hz, H-5A), 3.50 (m, 1H, H-5D), 3.30 (pt, 1H, H-4A), 2.85 (d, 1H, J1,OH=3.5 Hz, OH), 2.02, 1.97, 1.94 (3s, 9H, OAc), 1.23 (d, 3H, H-6A); 13C NMR: δ 171.1, 170.0, 169.6, 162.1 (C═O), 138.5-127.1 (Ph), 101.7 (C-1D), 94.1 (C-1A), 92.6 (CCl3), 81.4 (C-4A), 79.9 (C-2A), 77.3 (C-3A), 75.9, 74.1 (2C, CH2Ph), 72.7 (C-3D), 72.5 (C-5D), 68.6 (C-4D), 68.4 (C-5A), 62.2 (C-6D), 56.1 (C-2D), 21.1, 21.0, 20.9 (3C, OAc), 18.3 (C-6A). FAB-MS for C34H40Cl3NO13 (M, 775), m/z 789 [M+Na]+. Anal. Calcd for C34H40Cl3NO13: C, 52.55; H, 5.19; N, 1.80%. Found: C, 52.48; H, 5.37; N, 1.67%.

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