Isopropylamine → Methyl 2-(4-chlorophenyl)-3-[(propan-2-yl)amino]propanoate

HRID 2191542Notes

Reaction equation

HRID 2191542 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](=[CH2:13])[C:9]([O:11][CH3:12])=[O:10])=[CH:4][CH:3]=1.[CH:14]([NH2:17])([CH3:16])[CH3:15]>C1COCC1>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([CH:8]([CH2:13][NH:17][CH:14]([CH3:16])[CH3:15])[C:9]([O:11][CH3:12])=[O:10])=[CH:6][CH:7]=1

Participants

4

Reactant 2

HCID 6363IsopropylamineHCID 11735736Methyl 2-(4-chlorophenyl)acrylate

Product 1

HCID 66617943Methyl 2-(4-chlorophenyl)-3-[(propan-2-yl)amino]propanoate

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

Methyl 2-(4-chlorophenyl)acrylate (1.00 g, 5.09 mmol) was added as a solution in THF (2.5 mL) to a stirring solution of i-PrNH2 (650 uL, 7.63 mmol) in THF (10 mL) The reaction was allowed to stir at room temperature overnight to completion by LCMS analysis. The solvent was removed under reduced pressure to give methyl 2-(4-chlorophenyl)-3-(isopropylamino)propanoate (LCMS (APCI+) [M-Boc+H]+ 256.1, Rt: 1.97 min), which was re-dissolved in DCM (15 mL) at room temperature. The Boc2O (1.29 mL, 5.59 mmol) was added to the stirring amine via pipette followed by a catalytic amount (1 mg) of DMAP. The reaction was allowed to stir overnight to completion by LCMS and TLC analysis of the mixture. The solution was concentrated in vacuo to afford methyl 3-(tert-butoxycarbonyl(isopropypamino)-2-(4-chlorophenyl)propanoate as an oily residue (LCMS (APCI+) [M-Boc+H]+ 256.1, Rt: 4.13 min) which was re-dissolved in THF (12.0 mL) and water (4.0 mL). The solution was treated with LiOH—H20 (1.07 g, 25.4 mmol) and allowed to stir for 4 hours to completion by LCMS analysis. The solution was diluted with water and washed with diethyl ether (discarded). The aqueous was treated with 1M HCl solution until a pH of about 2 to about 3 was achieved and extracted with ethyl acetate several times. The organics were combined, washed with brine, separated, dried over MgSO4, filtered, and concentrated in vacuo to afford 3-(tert-butoxycarbonyl(isopropyl)amino)-2-(4-chlorophenyl)propanoic acid as an oil (1.04 g, 60%). LCMS (APCI+) [M-Boc+H]+ 242.0.

Workup

  1. customThe solvent was removed under reduced pressure

Sources & evidence

ORD record
ord-8939680db82740829be1b6b340e4c4ed
Source dataset
uspto-grants-2012_12
Patent number
US08329701B2

Reaction notes

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