Methylamine → N-{[8-(2-chlorophenyl)-3,4-dihydro-2H-chromen-2-yl]methyl}-N-methylamine

HRID 902291Notes

Reaction equation

HRID 902291 reaction equation
CC1C=CC(S(O[CH2:12][CH:13]2[CH2:22][CH2:21][C:20]3[C:15](=[C:16]([C:23]4[CH:28]=[CH:27][CH:26]=[CH:25][C:24]=4[Cl:29])[CH:17]=[CH:18][CH:19]=3)[O:14]2)(=O)=O)=CC=1.[CH3:30][NH2:31]>CS(C)=O.C(OCC)C>[Cl:29][C:24]1[CH:25]=[CH:26][CH:27]=[CH:28][C:23]=1[C:16]1[CH:17]=[CH:18][CH:19]=[C:20]2[C:15]=1[O:14][CH:13]([CH2:12][NH:31][CH3:30])[CH2:22][CH2:21]2

Participants

5

Reactant 2

HCID 6329MethylamineHCID 86609095[8-(2-chlorophenyl)-3,4-dihydro-2H-chromen-2-yl]methyl 4-methylbenzenesulfonate

Product 1

HCID 15942184N-{[8-(2-chlorophenyl)-3,4-dihydro-2H-chromen-2-yl]methyl}-N-methylamineYield 79.9%

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolventHCID 3283Diethyl EtherSolvent

Conditions

Temperature
60 °C

Procedure

To a suspension of [8-(2-chlorophenyl)-3,4-dihydro-2H-chromen-2-yl]methyl 4-methylbenzenesulfonate (0.13 g, 0.30 mmol) in dimethylsulfoxide (0.5 mL) was added a solution of methylamine (2.0 M in tetrahydrofuran, 1.5 mL, 3.0 mmol) and the mixture heated to 60° C. in a sealed vial for 24 hours. The cooled reaction mixture was then diluted with diethyl ether (10 mL), washed with water (5×5 mL) and saturated brine (5 mL), dried over magnesium sulfate, filtered and concentrated under reduced pressure to afford a yellow oil. Purification by flash chromatography using a solvent gradient of 0.5 to 5% ammonia saturated methanol solution in dichloromethane gave 69 mg (79%) of N-{[8-(2-chlorophenyl)-3,4-dihydro-2H-chromen-2-yl]methyl}-N-methylamine. The product was dissolved in diethyl ether (1 mL) and a solution of hydrogen chloride (1.0 M in diethyl ether, 0.25 mL, 0.25 mmol) was added followed by 2-propanol (3 drops). The resulting white precipitate was filtered to afford 74 mg (76%) of N-{[8-(2-chlorophenyl)-3,4-dihydro-2H-chromen-2-yl]methyl}-N-methylamine hydrochloride as a white solid. HRMS: calcd for C17H18ClNO+H+, 288.11497. found (ESI, [M+H]+), 288.1143.

Workup

  1. customThe cooled reaction mixture
  2. washwashed with water (5×5 mL) and saturated brine (5 mL)
  3. dry with materialdried over magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customto afford a yellow oil
  7. customPurification by flash chromatography

Sources & evidence

ORD record
ord-4a752fdecd7041c589442c3712920bac
Source dataset
uspto-grants-2008_04
Patent number
US07365095B2

Reaction notes

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