Diisopropylethylamine → N'-(8-Bromo-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene-2-carbonyl)-N'-isopropyl-hydrazinecarboxylic acid tert-butyl ester

HRID 2044529Notes

Reaction equation

HRID 2044529 reaction equation
[Br:1][C:2]1[CH:18]=[CH:17][C:5]2[C:6]3[N:10]([CH2:11][CH2:12][O:13][C:4]=2[CH:3]=1)[CH:9]=[C:8]([C:14]([OH:16])=O)[N:7]=3.[C:19]([O:23][C:24]([NH:26][NH:27][CH:28]([CH3:30])[CH3:29])=[O:25])([CH3:22])([CH3:21])[CH3:20].CCN(C(C)C)C(C)C.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F>CN(C=O)C>[C:19]([O:23][C:24]([NH:26][N:27]([C:14]([C:8]1[N:7]=[C:6]2[N:10]([CH2:11][CH2:12][O:13][C:4]3[CH:3]=[C:2]([Br:1])[CH:18]=[CH:17][C:5]=32)[CH:9]=1)=[O:16])[CH:28]([CH3:30])[CH3:29])=[O:25])([CH3:22])([CH3:21])[CH3:20]

Participants

6

Reactant 4

HCID 81531DiisopropylethylamineHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 11217534N'-(propan-2-yl)(tert-butoxy)carbohydrazideHCID 582043519-Bromo-5,6-dihydrobenzo[F]imidazo[1,2-D][1,4]oxazepine-2-carboxylic acid

Product 1

HCID 58204773N'-(8-Bromo-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene-2-carbonyl)-N'-isopropyl-hydrazinecarboxylic acid tert-butyl esterYield 104.7%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent2×

Procedure

To a mixture of 8-bromo-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene-2-carboxylic acid (1.92 g, 6.2 mmol) and N′-isopropyl-hydrazinecarboxylic acid tert-butyl ester (1.30 g, 7.5 mmol) in DMF (20 mL) at 0° C. was added DIPEA (2.70 mL, 15.5 mmol) and HATU (3.54 g, 9.3 mmol). The reaction mixture was stirred for 7 h at RT before the addition of DMF (40 mL) and stirring overnight. The reaction mixture was concentrated in vacuo and the resultant residue partitioned between DCM and water. The aqueous phase was extracted with DCM (×2) before the combined organic extracts were washed sequentially with 10% citric acid solution, saturated sodium bicarbonate solution then brine, dried (Na2SO4) and concentrated in vacuo. The resultant residue was subjected to flash chromatography (SiO2, gradient 0-90% ethyl acetate in cyclohexane) to give N′-(8-Bromo-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene-2-carbonyl)-N′-isopropyl-hydrazinecarboxylic acid tert-butyl ester as a white solid (3.02 g, quantitative yield). LCMS RT=4.76 min, [M+H]+=465/467. 1H NMR 400 MHz (DMSO-d6) δ: 8.62 (1H, s), 8.40 (1H, d, J=8.59 Hz), 7.69 (1H, s), 7.23-7.22 (2H, m), 4.81 (1H, s), 4.44 (4H, s), 1.32 (9H, s), 1.13 (6H, d, J=6.64 Hz)

Workup

  1. concentrationThe reaction mixture was concentrated in vacuo
  2. customthe resultant residue partitioned between DCM and water
  3. extractionThe aqueous phase was extracted with DCM (×2) before the combined organic extracts
  4. washwere washed sequentially with 10% citric acid solution, saturated sodium bicarbonate solution
  5. dry with materialbrine, dried (Na2SO4)
  6. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-ab79159e80fc42cc8b802db73d2f3169
Source dataset
uspto-grants-2013_11
Patent number
US08586574B2

Reaction notes

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