Pyridine → HCID 87277104, compound

HRID 406162Notes

Reaction equation

HRID 406162 reaction equation
[OH:1][C:2]1[C:7]2[C@@:8]3([OH:46])[C@@:21]([O:25][CH3:26])([C@H:22]([OH:24])[CH2:23][C:6]=2[CH:5]=[C:4]([CH3:47])[C:3]=1[C:48]([O:50][CH3:51])=[O:49])[C:20](=[O:27])[C:19]1[C:10](=[CH:11][C:12]2[C:13](=[O:44])[C:14]([NH:30][C@@H:31]4[C@H:36]([O:37][CH3:38])[C:35](=[N:39][OH:40])[C@@H:34]([O:41][CH3:42])[C@H:33]([CH3:43])[O:32]4)=[CH:15][C:16](=[O:29])[C:17]=2[C:18]=1[OH:28])[C:9]3=[O:45].Cl.O(N)[CH3:54].N1C=CC=CC=1>CO>[CH3:38][O:37][C@H:36]1[C@@H:31]([NH:30][C:14]2[C:13](=[O:44])[C:12]3[CH:11]=[C:10]4[C:19]([C:20](=[O:27])[C@@:21]5([O:25][CH3:26])[C@@:8]([OH:46])([C:9]4=[O:45])[C:7]4[C:2]([OH:1])=[C:3]([C:48]([O:50][CH3:51])=[O:49])[C:4]([CH3:47])=[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]=2)[O:32][C@@H:33]([CH3:43])[C@H:34]([O:41][CH3:42])/[C:35]/1=[N:39]/[O:40][CH3:54]

Participants

5

Reactant 3

HCID 1049PyridineHCID 521874O-Methylhydroxylamine hydrochlorideHCID 86660839HCID 86660839, compound

Product 1

HCID 87277104HCID 87277104, compoundYield 54%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a solution of the ketone from Step A of the preparation of (6R,6aS,14aR)-methyl 1,6,8,14a-tetrahydroxy-11-((2S,3R,5R,6S)-4-(hydroxyimino)-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 [Isomer A] (Example 48) (53 mg, 0.076 mmol) in methanol (1 mL) was added methoxylamine hydrochloride (6.4 mg, 0.076 mmol) and pyridine (0.1 mL) at room temperature. The mixture was stirred under nitrogen for 2 h. The reaction mixture was quenched with 1N HCl and extracted with ethyl acetate. The combined extracts were washed with brine, dried (Na2SO4), filtered and concentrated. The residue was purified by preparative TLC (silica gel, 95:5 chloroform/methanol) to afford (6R,6aS,14aR)-methyl 11-((2S,3R,5R,6S,Z)-3,5-dimethoxy-4-(methoxyimino)-6-methyltetrahydro-2H-pyran-2-ylamino)-1,6,8,14a-tetrahydroxy-6a-methoxy-3-methyl-7,9,12,14-tetraoxo-5,6,6a,7,9,12,14,14a-octahydrobenzo[a]tetracene-2-carboxylate (30 mg, 54%) as a red solid: 1H NMR (500 MHz, CDCl3) δ 14.15 (s, 1H), 12.09 (s, 1H), 8.20 (s, 1H), 7.00 (d, J=8.0 Hz, 1H), 6.54 (s, 1H), 5.86 (s, 1H), 5.21 (s, 1H), 4.98-4.94 (m, 2H), 4.67-4.64 (m, 2H), 3.97 (s, 3H), 3.84 (s, 3H), 3.71 (d, J=9.5 Hz, 1H), 3.59 (s, 3H), 3.57-3.52 (m, 2H), 3.47 (s, 3H), 3.40 (s, 3H), 3.34 (d, J=19.5 Hz, 1H), 2.40 (s, 3H), 1.38 (d, J=6.0 Hz, 3H); MS (ESI+) m/z 725 (M+H); HPLC 95.9% (AUC), tR 17.05 min.

Workup

  1. customThe reaction mixture was quenched with 1N HCl
  2. extractionextracted with ethyl acetate
  3. washThe combined extracts were washed with brine
  4. dry with materialdried (Na2SO4)
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe residue was purified by preparative TLC (silica gel, 95:5 chloroform/methanol)

Sources & evidence

ORD record
ord-1271083bcbaa4836ad43f47312ec7f1b
Source dataset
uspto-grants-2014_06
Patent number
US08754054B2

Reaction notes

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