Sodium hydride → 4,4-Dimethyl-2-phenyl-1,2,3,4-tetrahydro-pyrrolo[1,2-a]pyrimidine-8-carboxylic acid ethyl ester

HRID 63775Notes

Reaction equation

HRID 63775 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[CH:10]=[CH:9][NH:8][C:7]=1[NH2:11])=[O:5])[CH3:2].[H-].[Na+].[CH3:14][C:15]([CH3:25])=[CH:16][C:17]([C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)=O.[BH4-].[Na+]>CN(C=O)C.CCOC(C)=O.CCO>[CH2:1]([O:3][C:4]([C:6]1[CH:10]=[CH:9][N:8]2[C:15]([CH3:25])([CH3:14])[CH2:16][CH:17]([C:19]3[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=3)[NH:11][C:7]=12)=[O:5])[CH3:2]

Participants

8

Reactant 4

HCID 24758Sodium hydrideHCID 976742-Buten-1-one, 3-methyl-1-phenyl-HCID 4311764Sodium borohydrideHCID 12111022Ethyl 2-amino-1H-pyrrole-3-carboxylate

Product 1

HCID 576321734,4-Dimethyl-2-phenyl-1,2,3,4-tetrahydro-pyrrolo[1,2-a]pyrimidine-8-carboxylic acid ethyl esterYield 63.8%

Reagents, catalysts & solvents 3

HCID 702EthanolSolventHCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

Compound 1 (0.68 g, 4.41 mmol) was dissolved in DMF (5 mL). NaH (60% in mineral oil, 0.19 g, 4.7 mmol) was added at room temperature affording rapid gas evolution. The reaction stirred for 0.5 h upon which 3-methyl-1-phenyl-but-2-en-1-one (0.50 g, 3.15 mmol) was added. The reaction stirred for 0.5 h upon which EtOH (5 mL) and NaBH4 (1.19 g) were added. The solution was brought to 60° C. for 0.5 h. and then cooled to room temperature. The solution was quenched with water, extracted with Et2O (3 times), dried (Na2SO4) and concentrated. Flash chromatography (10% AcOEt) to give the desired product as a tan solid (0.60 g, 63% yield). MS Calcd.: 298. Found 299 (M+H).

Workup

  1. customaffording rapid gas evolution
  2. additionwas added
  3. additionwere added
  4. customThe solution was quenched with water
  5. extractionextracted with Et2O (3 times)
  6. dry with materialdried (Na2SO4)
  7. concentrationconcentrated

Sources & evidence

ORD record
ord-22b71515135e4ad28d902d2602262a95
Source dataset
uspto-grants-2016_09
Patent number
US09447100B2

Reaction notes

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