1,8-Diazabicyclo(5.4.0)undec-7-ene → (E)-5-amino-3,3-dimethyl-6-nitro-1-(pent-2-enyl)-1,3-dihydro-indol-2-one

HRID 2235337Notes

Reaction equation

HRID 2235337 reaction equation
[CH3:1][C:2]1([CH3:19])[C:10]2[C:5](=[CH:6][C:7]([N+:15]([O-:17])=[O:16])=[C:8]([NH:11]C(=O)C)[CH:9]=2)[NH:4][C:3]1=[O:18].Br[CH2:21]/[CH:22]=[CH:23]/[CH2:24][CH3:25].CC([O-])(C)C.[K+].C1CCN2C(=NCCC2)CC1>CO>[NH2:11][C:8]1[CH:9]=[C:10]2[C:5](=[CH:6][C:7]=1[N+:15]([O-:17])=[O:16])[N:4]([CH2:21]/[CH:22]=[CH:23]/[CH2:24][CH3:25])[C:3](=[O:18])[C:2]2([CH3:1])[CH3:19]

Participants

6

Reactant 4

HCID 811841,8-Diazabicyclo(5.4.0)undec-7-eneHCID 54630001-Bromo-2-pentene, predominantly transHCID 23092658N-(3,3-Dimethyl-6-nitro-2-oxo-2,3-dihydro-1H-indol-5-yl)acetamideHCID 23665647Potassium tert-butoxide

Product 1

HCID 23092652(E)-5-amino-3,3-dimethyl-6-nitro-1-(pent-2-enyl)-1,3-dihydro-indol-2-oneYield 37.1%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

Analogously to general procedure (I) N-(3,3-dimethyl-6-nitro-2-oxo-2,3-dihydro-1H-indol-5-yl)-acetamide (1.47 g) is alkylated using (E)-1-bromo-2-pentene (1 g; 6.71 mmol) and KOtBu (0.75 g; 6.71 mmol) at RT for 20 h. After aqueous work-up and flash chromatography on silica gel eluting with light petroleum/EtOAc (2.5:1) the pure alkylated acetamide (0.85 g; 2.58 mmol) is de-acetylated under reflux conditions using DBU (0.6 ml) in MeOH (60 ml). (E)-5-amino-3,3-dimethyl-6-nitro-1-(pent-2-enyl)-1,3-dihydro-indol-2-one (0.6 g) is obtained after an aqueous work-up.

Workup

  1. customat RT
  2. customfor 20 h

Sources & evidence

ORD record
ord-1395ff5ab8d047fa81987882a2c23df4
Source dataset
uspto-grants-2010_05
Patent number
US07714010B2

Reaction notes

Loading…