Hydrochloric Acid → 1-(p-Tolyl)cyclopropanamine

Temperature

-78 °C

In a flame dried round-bottomed flask equipped with a magnetic stir bar and under inert atmosphere (N2), a solution of p-tolunitrile (1195 mg, 10.00 mmol) in dry Et2O (50 mL) was treated at −78° C. with Ti(Oi-Pr)4 (3.22 mL, 11.00 mmol) followed by EtMgBr (7.33 mL of a 3.0 M solution in Et2O, 22.00 mmol). The resulting yellow suspension was stirred at −78° C. for 10 min, then warmed up to rt. To the resulting black suspension was added BF3.Et2O (2.47 mL, 20.00 mmol) and the reaction mixture was stirred at rt for 1 h. Aqueous 1N HCl (30 mL) was carefully added, followed by Et2O and then 10% aqueous NaOH (100 mL). The layers were separated and the aq. layer extracted with Et2O. The combined org. extracts were dried over MgSO4, filtered and concentrated under reduced pressure. The crude residue was purified by FC(CH2Cl2/MeOH/NH4OH, 1:0:0→90:10:0.5) to get the title amine as a yellow oil. TLC: rf (CH2Cl2/MeOH/NH4OH, 95:5:0.5)=0.46. LC-MS-conditions 07b: tR=0.49 min; [M+H]+=148.29.

1. temperaturewarmed up to rt
2. stirringthe reaction mixture was stirred at rt for 1 h
3. customThe layers were separated
4. extractionthe aq. layer extracted with Et2O
5. dry with materialextracts were dried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe crude residue was purified by FC(CH2Cl2/MeOH/NH4OH, 1:0:0→90:10:0.5)

ORD record

ord-c621c4a3013d41f8950fe26d5a0c8e7b

Source dataset

uspto-grants-2016_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09284288B2