Benzyl Bromide → 3,3-Dibenzyl-5-(3,4,5-trimethoxy-phenyl)-1,3-dihydro-pyrrolo[2,3-b]pyridin-2-one

HRID 712564Notes

Reaction equation

HRID 712564 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([C:13]2[CH:14]=[C:15]3[CH2:21][C:20](=[O:22])[NH:19][C:16]3=[N:17][CH:18]=2)[CH:6]=[C:7]([O:11][CH3:12])[C:8]=1[O:9][CH3:10].CN(CCN(C)C)C.[Li][CH2:32][CH2:33][CH2:34][CH3:35].[CH2:36](Br)[C:37]1[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=1.[CH2:44]1[CH2:48]OC[CH2:45]1>>[CH2:35]([C:21]1([CH2:36][C:37]2[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=2)[C:15]2[C:16](=[N:17][CH:18]=[C:13]([C:5]3[CH:6]=[C:7]([O:11][CH3:12])[C:8]([O:9][CH3:10])=[C:3]([O:2][CH3:1])[CH:4]=3)[CH:14]=2)[NH:19][C:20]1=[O:22])[C:34]1[CH:48]=[CH:44][CH:45]=[CH:32][CH:33]=1

Participants

6

Reactant 5

HCID 7498Benzyl BromideHCID 8028Tetrahydrofuran2×HCID 8037N,N,N',N'-TetramethylethylenediamineHCID 667786575-(3,4,5-Trimethoxy-phenyl)-1,3-dihydro-pyrrolo[2,3-b]pyridin-2-oneHCID 178418339Butyllithium

Product 1

HCID 462360463,3-Dibenzyl-5-(3,4,5-trimethoxy-phenyl)-1,3-dihydro-pyrrolo[2,3-b]pyridin-2-oneYield 38%

Procedure

5-(3,4,5-Trimethoxy-phenyl)-1,3-dihydro-pyrrolo[2,3-b]pyridin-2-one (95 mg, 0.316 mmol) and TMEDA (96 μl, 0.623 mmol) were dissolved in anhydrous THF (4 ml) and cooled to −78° C. n-BuLi (1.6 M in hexanes, 415 μl, 0.664 mmol) was added dropwise. After completed addition stirring was continued for 1 hr at −78° C. Benzyl bromide (41.3 μl, 0.348 mmol) was added dropwise as a 10% solution in anh. THF. After completed addition the reaction was allowed to warm up to room temperature while stirring overnight. The reaction was quenched by the addition of MeOH, evaporated and partitioned between water and DCM. Silica gel chromatography eluting with 0-50% EtOAc:Hexanes yielded the title compound (47 mg, 38%). 1H NMR (CDCl3, 300 MHz): δ 8.83 (s, 1H), 8.18 (d, J=1.2 Hz, 1H), 7.19 (d, J=1.2 Hz, 1H), 7.14 (m, 6H), 6.99 (m, 4H), 6.61 (s, 2H), 3.96 (s, 6H), 3.90 (s, 3H), 3.30 (d, J=8.0 Hz, 2H), 3.26 (d, J=8.0 Hz, 2H).

Workup

  1. additionwas added dropwise
  2. additionaddition
  3. additionaddition the reaction
  4. stirringwhile stirring overnight
  5. customThe reaction was quenched by the addition of MeOH
  6. customevaporated
  7. custompartitioned between water and DCM
  8. washSilica gel chromatography eluting with 0-50% EtOAc

Sources & evidence

ORD record
ord-87017fa9f02840809f1973a95990282a
Source dataset
uspto-grants-2015_11
Patent number
US09181247B2

Reaction notes

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