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

HRID 2178277
Notes
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Reaction equation

HRID 2178277 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+].S1C2C=CC=CC=2N=C1NC(N1C2C(=CC=C(C3SC(C4C=CC(OC)=CC=4)=C(C(O)=O)N=3)C=2)CCC1)=O>[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.O1CCOCC1.CCOC(C)=O>[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]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

8

Reactant 4

HCID 11430Potassium CarbonateHCID 468407902-(1-(Benzo[d]thiazol-2-ylcarbamoyl)-1,2,3,4-tetrahydroquinolin-7-yl)-5-(4-methoxyphenyl)thiazole-4-carboxylic acidHCID 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 59418702
tert-butyl 6-(6-(methoxycarbonyl)-5-(3-phenoxypropoxy)pyridin-2-yl)-2H-benzo[b][1,4]oxazine-4(3H)-carboxylate

Reagents, catalysts & solvents 3

HCID 74236Tetrabutylammonium BromideCatalystHCID 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 (1) (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-c8da16e38ae54d8f8f399c6840bfc934
Source dataset
uspto-grants-2015_06
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US09067928B2

Reaction notes

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