Acetic Anhydride → (2S,4aR,6aR,7R,9S,10aS,10bR)-9-(Acetylamino)-2-(3-furanyl)-dodecahydro-6a,10b-dimethyl-4,10-dioxo-2H-naphtho[2,1-c]pyran-7-carboxylic acid methyl ester

HRID 12325Notes

Reaction equation

HRID 12325 reaction equation
[CH3:1][O:2][C:3]([C@@H:5]1[CH2:18][C@H:17]([NH2:19])[C:16](=[O:20])[C@H:15]2[C@@:6]1([CH3:28])[CH2:7][CH2:8][C@@H:9]1[C@:14]2([CH3:21])[CH2:13][C@@H:12]([C:22]2[CH:26]=[CH:25][O:24][CH:23]=2)[O:11][C:10]1=[O:27])=[O:4].[C:29](OC(=O)C)(=[O:31])[CH3:30]>CN(C1C=CN=CC=1)C.C(Cl)Cl>[CH3:1][O:2][C:3]([C@@H:5]1[CH2:18][C@H:17]([NH:19][C:29](=[O:31])[CH3:30])[C:16](=[O:20])[C@H:15]2[C@@:6]1([CH3:28])[CH2:7][CH2:8][C@@H:9]1[C@:14]2([CH3:21])[CH2:13][C@@H:12]([C:22]2[CH:26]=[CH:25][O:24][CH:23]=2)[O:11][C:10]1=[O:27])=[O:4]

Participants

5

Reactant 2

HCID 7918Acetic AnhydrideHCID 44415859(2S,4aR,6aR,7R,9S,10aS,10bR)-9-(Amino)-2-(3-furanyl)-dodecahydro-6a,10b-dimethyl-4,10-dioxo-2H-naphtho[2,1-c]pyran-7-carboxylic acid methyl ester

Product 1

HCID 11561040(2S,4aR,6aR,7R,9S,10aS,10bR)-9-(Acetylamino)-2-(3-furanyl)-dodecahydro-6a,10b-dimethyl-4,10-dioxo-2H-naphtho[2,1-c]pyran-7-carboxylic acid methyl esterYield 58%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent

Procedure

A solution of 39 (0.06 g, 0.16 mmol), acetic anhydride (0.4 mL, 4.23 mmol) and a catalytic amount of DMAP in CH2Cl2 (30 mL) was stirred at room temperature for 2 h. The mixture was washed with 2N HCl (30 mL), 2N NaOH (30 mL), and H2O (30 mL) and dried (Na2SO4). Removal of the solvent under reduced pressure afforded a crude solid. The crude solid was purified by column chromatography (eluent: 4% MeOH/CH2Cl2) to afford 0.04 g (58%) of 40 as a white solid, mp 222-224° C. (EtOAc/n-hexanes).

Workup

  1. washThe mixture was washed with 2N HCl (30 mL), 2N NaOH (30 mL), and H2O (30 mL)
  2. dry with materialdried (Na2SO4)
  3. customRemoval of the solvent under reduced pressure
  4. customafforded a crude solid
  5. customThe crude solid was purified by column chromatography (eluent: 4% MeOH/CH2Cl2)

Sources & evidence

ORD record
ord-0a37b151aa0046209d46305b4b391f88
Source dataset
uspto-grants-2010_06
Patent number
US07728001B2

Reaction notes

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