Water → (6aR,7S,9aS,11R,12S,13aS)-12-acetoxy-5-benzyloxy-2-(t-butoxycarbonyl)-2,3,6,6a,7,8,9,9a,10,11,12,13-dodecahydro-11-hydroxy-6a,7,10,10-tetramethyl-3-oxo-1H-benzo[8,8a][1]benzopyrano[2,3-e]isoindole

HRID 1417624Notes

Reaction equation

HRID 1417624 reaction equation
[CH2:1]([O:8][C:9]1[C:10]2[CH2:29][C@:28]3([CH3:43])[C@@H:30]([CH3:42])[CH2:31][CH2:32][C@H:33]4[C:34]([CH3:41])([CH3:40])[C@@H:35]([OH:39])[C@@H:36]([OH:38])[CH2:37][C@@:27]34[O:26][C:11]=2[C:12]2[CH2:13][N:14]([C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[C:15](=[O:18])[C:16]=2[CH:17]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.CN(C1C=CC=CN=1)C.[C:53](Cl)(=[O:55])[CH3:54].O>ClCCl>[C:53]([O:38][C@@H:36]1[C@H:35]([OH:39])[C:34]([CH3:41])([CH3:40])[C@H:33]2[C@@:27]3([O:26][C:11]4[C:12]5[CH2:13][N:14]([C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[C:15](=[O:18])[C:16]=5[CH:17]=[C:9]([O:8][CH2:1][C:2]5[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=5)[C:10]=4[CH2:29][C@:28]3([CH3:43])[C@@H:30]([CH3:42])[CH2:31][CH2:32]2)[CH2:37]1)(=[O:55])[CH3:54]

Participants

6

Reactant 4

HCID 962WaterHCID 6367Acetyl chlorideHCID 218852-DimethylaminopyridineHCID 86753824(6aR,7S,9aS,11R,12S,13aS)-5-benzyloxy-2-(t-butoxycarbonyl)-2,3,6,6a,7,8,9,9a,10,11,12,13-dodecahydro-11,12-dihydroxy-6a,7,10,10-tetramethyl-3-oxo-1H-benzo[8,8a][1]benzopyrano[2,3-e]isoindole

Product 1

HCID 86753827(6aR,7S,9aS,11R,12S,13aS)-12-acetoxy-5-benzyloxy-2-(t-butoxycarbonyl)-2,3,6,6a,7,8,9,9a,10,11,12,13-dodecahydro-11-hydroxy-6a,7,10,10-tetramethyl-3-oxo-1H-benzo[8,8a][1]benzopyrano[2,3-e]isoindoleYield 90%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of Compound (48a) (51 mg, 0.086 mmol) in 5.0 ml of dichloromethane were added 32 mg (0.26 mmol) of dimethylaminopyridine and 9.2 μl (0.13 mmol) of acetyl chloride under ice-cooling, and the mixture stirred for 30 min at the same temperature. After addition of water, the reaction mixture was extracted with ethyl acetate. The extract was washed sequentially with 1N HCl, water, an aqueous saturated hydrogen carbonate solution, and water, dried with anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by a column chromatography (Merck, Lobar column, size A; toluene:ethyl acetate=2:1) to give 49 mg (90%) of Compound (48b).

Workup

  1. temperaturecooling
  2. extractionthe reaction mixture was extracted with ethyl acetate
  3. washThe extract was washed sequentially with 1N HCl, water
  4. dry with materialan aqueous saturated hydrogen carbonate solution, and water, dried with anhydrous magnesium sulfate
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified by a column chromatography (Merck, Lobar column, size A

Sources & evidence

ORD record
ord-7a5457ec09b844d7ab700ee91f1edbf3
Source dataset
uspto-grants-1999_03
Patent number
US05876984

Reaction notes

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