Potassium Carbonate → tert-butyl 6-(6-(methoxycarbonyl)-5-(3-phenoxypropoxy)pyridin-2-yl)-2H-benzo[b][1,4]oxazine-4(3H)-carboxylate

HRID 1896626Notes

Reaction equation

HRID 1896626 reaction equation
CC1(C)C(C)(C)OB([C:9]2[CH:25]=[CH:24][C:12]3[O:13][CH2:14][CH2:15][N:16]([C:17]([O:19][C:20]([CH3:23])([CH3:22])[CH3:21])=[O:18])[C:11]=3[CH:10]=2)O1.Br[C:28]1[N:33]=[C:32]([C:34]([O:36][CH3:37])=[O:35])[C:31]([O:38][CH2:39][CH2:40][CH2:41][O:42][C:43]2[CH:48]=[CH:47][CH:46]=[CH:45][CH:44]=2)=[CH:30][CH:29]=1.C([O-])([O-])=O.[K+].[K+]>[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.O1CCOCC1.CCOC(C)=O.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[CH3:37][O:36][C:34]([C:32]1[N:33]=[C:28]([C:9]2[CH:25]=[CH:24][C:12]3[O:13][CH2:14][CH2:15][N:16]([C:17]([O:19][C:20]([CH3:21])([CH3:22])[CH3:23])=[O:18])[C:11]=3[CH:10]=2)[CH:29]=[CH:30][C:31]=1[O:38][CH2:39][CH2:40][CH2:41][O:42][C:43]1[CH:48]=[CH:47][CH:46]=[CH:45][CH:44]=1)=[O:35]

Participants

8

Reactant 3

HCID 11430Potassium CarbonateHCID 59418692tert-Butyl 6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,3-dihydro-4H-1,4-benzoxazine-4-carboxylateHCID 59418768HCID 59418768, compound

Product 1

HCID 59418702tert-butyl 6-(6-(methoxycarbonyl)-5-(3-phenoxypropoxy)pyridin-2-yl)-2H-benzo[b][1,4]oxazine-4(3H)-carboxylate

Reagents, catalysts & solvents 4

HCID 74236Tetrabutylammonium BromideCatalystHCID 178418476HCID 178418476, compoundCatalystHCID 8857Ethyl AcetateSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
90 °C

Procedure

A mixture of tert-butyl 6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2H-benzo[b][1,4]oxazine-4(3H)-carboxylate (53B) (72 mg, 0.20 mmol), methyl 6-bromo-3-(3-phenoxypropoxy)picolinate (26C) (72 mg, 0.20 mmol), K2CO3 (30 mg, 0.22 mmol in 0.5 mL of water), tetrabutyl ammonium bromide (64 mg, 0.20 mmol) and dichlorobis(triphenylphosphine)palladium (II) (10 mg, catalytic amount) in 1,4-dioxane (5 mL) was heated to 90° C. for 6 hours. The reaction mixture was cooled to rt, diluted with EtOAc, filtered through Celite, and concentrated under reduced pressure. The crude material was purified by column chromatography on silica gel eluting with 20% EtOAc in hexanes to provide the desired product tert-butyl 6-(6-(methoxycarbonyl)-5-(3-phenoxypropoxy)pyridin-2-yl)-2H-benzo[b][1,4]oxazine-4(3H)-carboxylate (53C). 1H NMR (300 MHz, CDCl3): 8.49 (1H, s), 7.74 (1H, d), 7.60 (1H, d), 7.38 (1H, d), 7.24 (2H, m), 6.90 (4H, m), 4.31 (2H, t), 4.18 (2H, t), 4.25 (2H, t), 3.95 (3H, s), 3.85 (2H, t), 2.3 (2H, m), 1.58 (9H, s). LCMS (APCI): m/z 521.1 (M+H).

Workup

  1. temperatureThe reaction mixture was cooled to rt
  2. filtrationfiltered through Celite
  3. concentrationconcentrated under reduced pressure
  4. customThe crude material was purified by column chromatography on silica gel eluting with 20% EtOAc in hexanes

Sources & evidence

ORD record
ord-29f8eb80881141288d766acc8725d3bd
Source dataset
uspto-grants-2013_08
Patent number
US08518970B2

Reaction notes

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