Potassium Carbonate → ethyl 6-chloro-7-[(3,3-dimethylbutyl)amino]-2-(trifluoromethyl)-2H-chromene-3-carboxylate

HRID 855077Notes

Reaction equation

[Cl:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][C:11]=1F)[O:8][CH:7]([C:13]([F:16])([F:15])[F:14])[C:6]([C:17]([O:19][CH2:20][CH3:21])=[O:18])=[CH:5]2.[CH3:22][C:23]([CH3:28])([CH3:27])[CH2:24][CH2:25][NH2:26].C([O-])([O-])=O.[K+].[K+]>CN(C=O)C>[Cl:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][C:11]=1[NH:26][CH2:25][CH2:24][C:23]([CH3:28])([CH3:27])[CH3:22])[O:8][CH:7]([C:13]([F:16])([F:15])[F:14])[C:6]([C:17]([O:19][CH2:20][CH3:21])=[O:18])=[CH:5]2

Participants

Conditions

Temperature: 90 °C

Procedure

A mixture of ethyl 6-chloro-7-fluoro-2-(trifluoromethyl)-2H-chromene-3-carboxylate (Example 7a, Step 2) (0.5 g, 1.54 mmole) and 3,3-dimethylbutylamine (0.21 mL, 1.54 mmole) was dissolved in anhydrous DMF (5 mL), warmed to 90° C. and treated with K2CO3 (0.25 g, 1.84 mmole). The mixture was maintained at 90° C. for 24 hrs, cooled to room temperature, filtered through celite and condensed to a viscous oil. The oil was purified by flash chromatography (silica gel) with 40% methylene chloride in hexane to give light yellow solid (0.54 g, 87%): GCMS ml/z 405.00 (M+). 1H NMR (CDCl3/400 MHz) 7.58 (s, 1H), 7.08 (s, 1H), 6.22 (s, 1H), 5.64 (q, 1H, J=7.0 Hz), 4.26 (m, 2H), 3.16 (m, 2H), 1.57 (m, 2H), 1.33 (m, 3H), 0.98 (s, 9H).

Workup

temperatureThe mixture was maintained at 90° C. for 24 hrs
temperaturecooled to room temperature
filtrationfiltered through celite and condensed to a viscous oil
customThe oil was purified by flash chromatography (silica gel) with 40% methylene chloride in hexane

Sources & evidence

ORD record: ord-ba0417181d9145fe87a697014a5f22c4
Source dataset: uspto-grants-2007_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07259266B2

Reaction notes

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