Nitric acid monohydrate → (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-4-nitro-7,9,12,14-tetraoxo-5,6,6a,7,9,12,14,14a-octahydrobenzo[a]tetracene-2-carboxylate

HRID 406155Notes

Reaction equation

HRID 406155 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].O.[N+:52]([O-])([OH:54])=[O:53]>C(#N)C>[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[C:5]([N+:52]([O-:54])=[O:53])=[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]

Participants

4

Reactant 2

HCID 22472390Nitric acid monohydrateHCID 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-carboxylate

Product 1

HCID 56600592(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-4-nitro-7,9,12,14-tetraoxo-5,6,6a,7,9,12,14,14a-octahydrobenzo[a]tetracene-2-carboxylateYield 33%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Conditions

Temperature
70 °C

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 (100 mg, 0.14 mmol) in acetonitrile (1 mL) was added zirconyl(IV) nitrate hydrate (36 mg, 0.16 mmol). The reaction mixture was heated to 70° C. for 1 h. After cooled to room temperature, the reaction mixture was filtered through a micro filter and the filtrate was concentrated under reduced pressure. The crude material was purified by preparative TLC (silica gel, 96:4 chloroform/methanol) and semi-preparative HPLC to afford (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-4-nitro-7,9,12,14-tetraoxo-5,6,6a,7,9,12,14,14a-octahydrobenzo[a]tetracene-2-carboxylate (34 mg, 33%) as a dark red solid: 1H NMR (500 MHz, CDCl3) δ 14.23 (s, 1H), 12.27 (br s, 1H), 8.19 (s, 1H), 6.86 (d, J=8.0 Hz, 1H), 5.89 (s, 1H), 5.31 (s, 1H), 5.19 (s, 1H), 4.69 (d, J=8.5 Hz, 1H), 4.61 (s, 1H), 3.91 (s, 3H), 3.79 (s, 3H), 3.76-3.65 (m, 2H), 3.61 (s, 3H), 3.49 (dd, J=19.5, 6.5 Hz, 1H), 3.40 (s, 3H), 3.39-3.35 (m, 1H), 3.28 (d, J=19.5 Hz, 1H), 3.13 (t, J=9.5 Hz, 1H), 2.47 (d, J=4.5 Hz, 1H), 2.40 (s, 3H), 1.36 (d, J=6.0 Hz, 3H); MS (ESI+) m/z 743 (M+H); HPLC 98.0% (AUC), tR 13.79 min.

Workup

  1. temperatureAfter cooled to room temperature
  2. filtrationthe reaction mixture was filtered through
  3. filtrationa micro filter
  4. concentrationthe filtrate was concentrated under reduced pressure
  5. customThe crude material was purified by preparative TLC (silica gel, 96:4 chloroform/methanol) and semi-preparative HPLC

Sources & evidence

ORD record
ord-152a66fb70fb42c8960402f6dab11a44
Source dataset
uspto-grants-2014_06
Patent number
US08754054B2

Reaction notes

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