Methyl(2-phenoxyethyl)amine → ethyl 2-(4-acetyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-(methyl(2-phenoxyethyl)amino)thiazole-4-carboxylate

HRID 2178220Notes

Reaction equation

[C:1]([N:4]1[CH2:9][CH2:8][O:7][C:6]2[CH:10]=[CH:11][C:12]([C:14]3[S:15][C:16](Cl)=[C:17]([C:19]([O:21][CH2:22][CH3:23])=[O:20])[N:18]=3)=[CH:13][C:5]1=2)(=[O:3])[CH3:2].[CH3:25][NH:26][CH2:27][CH2:28][O:29][C:30]1[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=1>CN(C=O)C>[C:1]([N:4]1[CH2:9][CH2:8][O:7][C:6]2[CH:10]=[CH:11][C:12]([C:14]3[S:15][C:16]([N:26]([CH3:25])[CH2:27][CH2:28][O:29][C:30]4[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=4)=[C:17]([C:19]([O:21][CH2:22][CH3:23])=[O:20])[N:18]=3)=[CH:13][C:5]1=2)(=[O:3])[CH3:2]

Participants

Conditions

Temperature: 70 °C

Procedure

To ethyl 2-(4-acetyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-chlorothiazole-4-carboxylate (7D) (0.15 g, 0.41 mmol) and methyl-(2-phenoxy-ethyl)-amine (1.24 g, 8.1 mmol) was added DMF (10 mL). The reaction mixture was allowed to heat to 70° C. for 48 hours. The reaction mixture was cooled to rt and concentrated under reduced pressure. The crude residue was purified by column chromatography on silica gel eluting with a gradient of 0 to 80% EtOAc in hexanes to provide 0.102 g (52%) of the desired product ethyl 2-(4-acetyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-(methyl(2-phenoxyethyl)amino)thiazole-4-carboxylate (20A): LC/MS (APCI): m/z 482.1 (M+H).

Workup

temperatureThe reaction mixture was cooled to rt
concentrationconcentrated under reduced pressure
customThe crude residue was purified by column chromatography on silica gel eluting with a gradient of 0 to 80% EtOAc in hexanes

Sources & evidence

ORD record: ord-c0cc5b43c9fc4586863ee3a17df0b544
Source dataset: uspto-grants-2015_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09067928B2

Reaction notes

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