Potassium Carbonate → 3-(4-Methyl-3-oxo-7-phenyl-2,3,4,10-tetrahydro-9-oxa-1,2,4a-triaza-phenanthren-6-ylamino)-azetidine-1-carboxylic acid tert-butyl ester

HRID 518950Notes

Reaction equation

HRID 518950 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:11][CH:10]([NH:12][C:13]2[CH:14]=[C:15]3[C:24](=[CH:25][C:26]=2Br)[O:23][CH2:22][C:21]2[N:16]3[CH:17]([CH3:29])[C:18](=[O:28])[NH:19][N:20]=2)[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[C:30]1(B(O)O)[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=1.C([O-])([O-])=O.[K+].[K+]>O1CCOCC1.O>[C:1]([O:5][C:6]([N:8]1[CH2:11][CH:10]([NH:12][C:13]2[CH:14]=[C:15]3[C:24](=[CH:25][C:26]=2[C:30]2[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=2)[O:23][CH2:22][C:21]2[N:16]3[CH:17]([CH3:29])[C:18](=[O:28])[NH:19][N:20]=2)[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 66827Phenylboronic AcidHCID 867272933-(7-Bromo-4-methyl-3-oxo-2,3,4,10-tetrahydro-9-oxa-1,2,4a-triaza-phenanthren-6-ylamino)-azetidine-1-carboxylic acid tert-butyl ester

Product 1

HCID 867272923-(4-Methyl-3-oxo-7-phenyl-2,3,4,10-tetrahydro-9-oxa-1,2,4a-triaza-phenanthren-6-ylamino)-azetidine-1-carboxylic acid tert-butyl esterYield 71.4%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
110 °C

Procedure

A mixture of 3-(7-bromo-4-methyl-3-oxo-2,3,4,10-tetrahydro-9-oxa-1,2,4a-triaza-phenanthren-6-ylamino)-azetidine-1-carboxylic acid tert-butyl ester (1 g, 2.1 mmol), phenylboronic acid (0.79 g, 6.4 mmol), 1,1′-bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex (0.351 g, 0.43 mmol) and K2CO3 (0.890 g, 6.4 mmol) in dioxane (24 mL) and water (4 mL) was heated at 110° C. overnight. The reaction mixture was cooled to ambient temperature and the solvent was removed in vacuo to give the crude product, which was purified by column chromatography (eluting with 10-40% EtOAc in petroleum ether) to give 3-(4-methyl-3-oxo-7-phenyl-2,3,4,10-tetrahydro-9-oxa-1,2,4a-triaza-phenanthren-6-ylamino)-azetidine-1-carboxylic acid tert-butyl ester (0.710 g racemate, 1.5 mmol, 71%) as an off-white powder. The racemic material was further separated by chiral SFC (Table 2, Method 1) to give two isomers: 3-(4(R)-methyl-3-oxo-7-phenyl-2,3,4,10-tetrahydro-9-oxa-1,2,4a-triaza-phenanthren-6-ylamino)-azetidine-1-carboxylic acid tert-butyl ester (Enantiomer 1, SFC (Table 1, Method 1), Rt=3.374 min., 0.281 g, 0.61 mmol, 29%) and 3-(4(S)-methyl-3-oxo-7-phenyl-2,3,4,10-tetrahydro-9-oxa-1,2,4a-triaza-phenanthren-6-ylamino)-azetidine-1-carboxylic acid tert-butyl ester (Enantiomer 2, SFC (Table 1, Method 1), Rt=4.333 min., 0.252 g, 26%). LC/MS (Table 1, Method 2) Rt=1.25 min.; MS m/z: 464 [M+H]+.

Workup

  1. temperatureThe reaction mixture was cooled to ambient temperature
  2. customthe solvent was removed in vacuo
  3. customto give the crude product, which
  4. customwas purified by column chromatography (eluting with 10-40% EtOAc in petroleum ether)

Sources & evidence

ORD record
ord-a9d0d348e53c483682393f2affa9375d
Source dataset
uspto-grants-2015_08
Patent number
US09115151B2

Reaction notes

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