(6R,6aS,14aR)-methyl 1,6,8,14a-tetrahydroxy-11-((2S,3R,4R,5R,6S)-4-hydroxy-3,5-dimethoxy-6-methyltetrahydro-2H-pyran-2-ylamino)-6a-methoxy-3-methyl-7,9,12,14-tetraoxo-5,6,6a,7,9,12,14,14a-octahydrobenzo[a]tetracene-2-carboxylate → HCID 56601588, compound

HRID 406169Notes

Reaction equation

HRID 406169 reaction equation
[OH:1][C:2]1[C:7]2[C@@:8]3([OH:45])[C@@:21]([O:25][CH3:26])([C@H:22]([OH:24])[CH2:23][C:6]=2[CH:5]=[C:4]([CH3:46])[C:3]=1[C:47]([O:49][CH3:50])=[O:48])[C:20](=[O:27])[C:19]1[C:10](=[CH:11][C:12]2[C:13](=[O:43])[C:14]([NH:30][C@@H:31]4[C@H:36]([O:37][CH3:38])[C@H:35]([OH:39])[C@@H:34]([O:40][CH3:41])[C@H:33]([CH3:42])[O:32]4)=[CH:15][C:16](=[O:29])[C:17]=2[C:18]=1[OH:28])[C:9]3=[O:44].[F:51][C:52]1[CH:57]=[CH:56][C:55]([Mg]Br)=[CH:54][CH:53]=1>C1COCC1>[F:51][C:52]1[CH:57]=[CH:56][C:55]([C:13]2([OH:43])[C:12]3[CH:11]=[C:10]4[C:19]([C:20](=[O:27])[C@@:21]5([O:25][CH3:26])[C@@:8]([OH:45])([C:9]4=[O:44])[C:7]4[C:2]([OH:1])=[C:3]([C:47]([O:49][CH3:50])=[O:48])[C:4]([CH3:46])=[CH:5][C:6]=4[CH2:23][C@H:22]5[OH:24])=[C:18]([OH:28])[C:17]=3[C:16](=[O:29])[CH:15]=[C:14]2[NH:30][C@@H:31]2[C@H:36]([O:37][CH3:38])[C@H:35]([OH:39])[C@@H:34]([O:40][CH3:41])[C@H:33]([CH3:42])[O:32]2)=[CH:54][CH:53]=1

Participants

4

Reactant 2

HCID 67121454(6R,6aS,14aR)-methyl 1,6,8,14a-tetrahydroxy-11-((2S,3R,4R,5R,6S)-4-hydroxy-3,5-dimethoxy-6-methyltetrahydro-2H-pyran-2-ylamino)-6a-methoxy-3-methyl-7,9,12,14-tetraoxo-5,6,6a,7,9,12,14,14a-octahydrobenzo[a]tetracene-2-carboxylateHCID 178418676HCID 178418676, compound

Product 1

HCID 56601588HCID 56601588, compound

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of (6R,6aS,14aR)-methyl 1,6,8,14a-tetrahydroxy-11-((2S,3R,4R,5R,6S)-4-hydroxy-3,5-dimethoxy-6-methyltetrahydro-2H-pyran-2-ylamino)-6a-methoxy-3-methyl-7,9,12,14-tetraoxo-5,6,6a,7,9,12,14,14a-octahydrobenzo[a]tetracene-2-carboxylate (200 mg, 0.28 mmol) in THF (5 mL) was added 4-fluorophenylmagnesium bromide (4.30 mL, 1.0 M solution in THF, 4.30 mmol) at −30° C. The mixture was stirred under nitrogen for 30 min. The reaction mixture was quenched with water (0.30 mL), the reaction was brought to room temperature and pH was adjusted to 7 with 1N HCl. The reaction mixture was extracted with dichloromethane (3×50 mL). The combined organic phase was washed with brine, dried (Na2SO4), filtered and concentrated. The crude material was purified by preparative HPLC (10:90 acetonitrile/water to 60:40 acetonitrile/water with 0.05% TFA over 10 min, then isocratic) to afford (6R,6aS,14aR)-methyl 12-(4-fluorophenyl)-1,6,8,12,14a-pentahydroxy-11-((2S,3R,4R,5R,6S)-4-hydroxy-3,5-dimethoxy-6-methyltetrahydro-2H-pyran-2-ylamino)-6a-methoxy-3-methyl-7,9,14-trioxo-5,6,6a,7,9,12,14,14a-octahydrobenzo[a]tetracene-2-carboxylate as a diastereomer A (13 mg, 7%) and as a yellow solid: 1H NMR (500 MHz, CD3OD) δ 7.58-7.55 (m, 2H), 7.53 (s, 1H), 7.13-7.07 (m, 2H), 6.60 (s, 1H), 5.69 (s, 1H), 4.93 (br s, 1H), 4.87 (s, 1H), 3.86 (s, 3H), 3.69-3.66 (m, 1H), 3.65 (s, 3H), 3.58-3.46 (m, 5H), 3.37-3.33 (m, 2H), 3.25-3.21 (m, 1H), 2.92 (t, J=9.0 Hz, 1H), 2.41 (s, 3H), 1.35-1.25 (m, 2H), 1.17 (d, J=6.5 Hz, 3H); MS (ESI+) m/z 794 (M+H); HPLC 95.4% (AUC), tR 13.49 min.

Workup

  1. customThe reaction mixture was quenched with water (0.30 mL)
  2. customwas brought to room temperature
  3. extractionThe reaction mixture was extracted with dichloromethane (3×50 mL)
  4. washThe combined organic phase was washed with brine
  5. dry with materialdried (Na2SO4)
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customThe crude material was purified by preparative HPLC (10:90 acetonitrile/water to 60:40 acetonitrile/water with 0.05% TFA over 10 min

Sources & evidence

ORD record
ord-85b33ae76a914269a74e8243280db929
Source dataset
uspto-grants-2014_06
Patent number
US08754054B2

Reaction notes

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