Acetic Anhydride → (E)-3-(4-Acetyl-2,3,4,5-tetrahydro-1H-pyrido[2,3-e][1,4]diazepin-7-yl)-N-methyl-N-(3-methylbenzofuran-2-ylmethyl)acrylamide

HRID 340827Notes

Reaction equation

HRID 340827 reaction equation
[CH3:1][N:2]([CH2:18][C:19]1[O:20][C:21]2[CH:28]=[CH:27][CH:26]=[CH:25][C:22]=2[C:23]=1[CH3:24])[C:3](=[O:17])/[CH:4]=[CH:5]/[C:6]1[CH:16]=[N:15][C:9]2[NH:10][CH2:11][CH2:12][NH:13][CH2:14][C:8]=2[CH:7]=1.CCN(CC)CC.[C:36](OC(=O)C)(=[O:38])[CH3:37]>C(Cl)Cl>[C:36]([N:13]1[CH2:14][C:8]2[CH:7]=[C:6](/[CH:5]=[CH:4]/[C:3]([N:2]([CH3:1])[CH2:18][C:19]3[O:20][C:21]4[CH:28]=[CH:27][CH:26]=[CH:25][C:22]=4[C:23]=3[CH3:24])=[O:17])[CH:16]=[N:15][C:9]=2[NH:10][CH2:11][CH2:12]1)(=[O:38])[CH3:37]

Participants

5

Reactant 3

HCID 7918Acetic AnhydrideHCID 8471TriethylamineHCID 45487682(E)-N-Methyl-N-(3-methylbenzofuran-2-ylmethyl)-3-(2,3,4,5-tetrahydro-1H-pyrido[2,3-e][1,4]diazepin-7-yl)acrylamide

Product 1

HCID 24891457(E)-3-(4-Acetyl-2,3,4,5-tetrahydro-1H-pyrido[2,3-e][1,4]diazepin-7-yl)-N-methyl-N-(3-methylbenzofuran-2-ylmethyl)acrylamideYield 76%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

A solution of (E)-N-methyl-N-(3-methylbenzofuran-2-ylmethyl)-3-(2,3,4,5-tetrahydro-1H-pyrido[2,3-e][1,4]diazepin-7-yl)acrylamide (105 mg, 0.280 mmol) in CH2Cl2 (6 mL) was treated with Et3N (0.05 mL, 0.36 mmol) followed by acetic anhydride (27 μL, 0.29 mmol). After stirring for 1.5 h, the mixture was diluted with CH2Cl2 (100 mL) and washed with H2O (25 mL). The organic layer was dried over Na2SO4, filtered and concentrated to a tan residue. Purification by flash column chromatography (silica gel, CH2Cl2/MeOH, 96:4) gave the title compound (89 mg, 76%) as a colorless residue and as a mixture of amide rotamers: MS (ESI) m/e 419 (M+H)+.

Workup

  1. washwashed with H2O (25 mL)
  2. dry with materialThe organic layer was dried over Na2SO4
  3. filtrationfiltered
  4. concentrationconcentrated to a tan residue
  5. customPurification by flash column chromatography (silica gel, CH2Cl2/MeOH, 96:4)

Sources & evidence

ORD record
ord-03671de67e0a46e9a9fa63050854063b
Source dataset
uspto-grants-2014_11
Patent number
US08895545B2

Reaction notes

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