Ammonia → 1-(4-Bromo-2-chlorophenyl)ethanamine

Temperatur

45 °C

A solution of 1-(4-bromo-2-chlorophenyl)ethanone (2.430 g, 10 mmol), ammonia, 2.0m solution in methanol (26 ml, 52 mmol) and titanium (iv) isopropoxide (6 ml, 21 mmol) was stirred for 16 h in a sealed vessel. Reaction then added to a freshly made suspension of sodium borohydride powder, 98% (4 g, 104 mmol) in MeOH (20 mL). Exothermic reaction started at 9:45 am, then continued to stir with a 45° C. external heating bath for 45 min. Water (10 mL ) then added to reaction and stirred for an additional 10 min. Resulting white solid removed via filtration through Celite, and filtrated reduced in volume under reduced pressure. This suspension then partioned between 9:1 CHCl3/IPA (30 mL) and 1M NaOH (10 mL). Aqueous further extracted with 9:1 CHCl3/IPA (2×10 mL). Combined organics dried over MgSO4, concentrated, then purified on silica (80 g) eluting with 0>5% 2M NH3 in MeOH/DCM. MS (ESI pos. ion) m/z: 234/236 (MH+). Calc'd exact mass for C8H9BrClN: 233/235. 1-(4-bromo-2-chlorophenyl)ethanamine isolated as a colorless oil.

1. customReaction
2. customExothermic reaction
3. stirringstirred for an additional 10 min
4. customResulting white solid
5. customremoved via filtration through Celite
6. filtrationfiltrated
7. extractionAqueous further extracted with 9:1 CHCl3/IPA (2×10 mL)
8. dry with materialCombined organics dried over MgSO4
9. concentrationconcentrated
10. custompurified on silica (80 g)
11. washeluting with 0>5% 2M NH3 in MeOH/DCM

ORD-Eintrag

ord-3ae8fec9193e4688b46b77208d843d05

Quelldatensatz

uspto-grants-2012_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08198448B2