Dichloromethane → 1,1-dimethylethyl 7-(6-amino-5-nitropyridin-3-yl)-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate

HRID 473883Notes

Reaction equation

HRID 473883 reaction equation
[NH2:1][C:2]1[C:7]([N+:8]([O-:10])=[O:9])=[CH:6][C:5](Br)=[CH:4][N:3]=1.[CH3:12][C:13]([O:16][C:17]([N:19]1[CH2:25][C:24]2[CH:26]=[C:27](B(O)O)[CH:28]=[CH:29][C:23]=2[O:22][CH2:21][CH2:20]1)=[O:18])([CH3:15])[CH3:14].ClCCl.C(N(C(C)C)CC)(C)C>O1CCOCC1>[NH2:1][C:2]1[N:3]=[CH:4][C:5]([C:27]2[CH:28]=[CH:29][C:23]3[O:22][CH2:21][CH2:20][N:19]([C:17]([O:16][C:13]([CH3:14])([CH3:12])[CH3:15])=[O:18])[CH2:25][C:24]=3[CH:26]=2)=[CH:6][C:7]=1[N+:8]([O-:10])=[O:9]

Participants

6

Reactant 4

HCID 6344DichloromethaneHCID 81531DiisopropylethylamineHCID 1388782-Amino-5-bromo-3-nitropyridineHCID 59604707(4-(Tert-butoxycarbonyl)-2,3,4,5-tetrahydrobenzo[f][1,4]oxazepin-7-yl)boronic acid

Product 1

HCID 668202001,1-dimethylethyl 7-(6-amino-5-nitropyridin-3-yl)-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylateYield 48.4%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Conditions

Temperature
90 °C

Procedure

A mixture of 2-amino-5-bromo-3-nitropyridine (0.70 g, 3.2 mmol), (4-{[(1,1-dimethylethyl)oxy]carbonyl}-2,3,4,5-tetrahydro-1,4-benzoxazepin-7-yl)boronic acid (example 1, step 2) (1.0 g, 3.1 mmol), [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) complex with dichloromethane (0.15 mg, 0.2 mmol), diisopropylethylamine (1.8 g, 14 mmol) in 50% aqueous 1,4-dioxane (40 mL) was degassed with nitrogen for 5 minutes and then stirred at 90° C. for one hour. The reaction mixture was cooled to room temperature, diluted with ethyl acetate (80 mL) then filtered over celite. The filtrate was washed twice with brine (50 mL), filtered and the filtrate dried over sodium sulfate, filtered again and concentrated. The residue was purified by silica gel chromatography (25% to 95% ethyl acetate in hexanes gradient) to give 1,1-dimethylethyl 7-(6-amino-5-nitropyridin-3-yl)-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate (0.58 g, 48% yield); MS (EI) for C19H22N4O5: 389 (MH+).

Workup

  1. customwas degassed with nitrogen for 5 minutes
  2. temperatureThe reaction mixture was cooled to room temperature
  3. additiondiluted with ethyl acetate (80 mL)
  4. filtrationthen filtered over celite
  5. washThe filtrate was washed twice with brine (50 mL)
  6. filtrationfiltered
  7. dry with materialthe filtrate dried over sodium sulfate
  8. filtrationfiltered again
  9. concentrationconcentrated
  10. customThe residue was purified by silica gel chromatography (25% to 95% ethyl acetate in hexanes gradient)

Sources & evidence

ORD record
ord-2652eb9281204a459e8ca915cc319252
Source dataset
uspto-grants-2014_01
Patent number
US08637499B2

Reaction notes

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