Aluminum(III) Chloride → 1-Methyl-1,2,3,4-tetrahydroisoquinoline

Temperature

150 °C

200 g (647.17 mmole) of N-(2-bromoethyl)-α-methylbenzylamine hydrobromide produced in Example 5(2) or Example 6(1) above was suspended in 700 ml of decalin and then heated to 150° C. 261.5 g (1961 mmole) of anhydrous aluminum chloride was added thereto over 40 minutes. The reaction solution was stirred for s further 30 minutes at constant temperature and then cooled to room temperature. The supernatant was removed and the lower layer was poured onto 3500 g of ice-water with stirring. 210 ml of con. hydrochloric acid was added thereto and the mixture was stirred for 10 minutes. This solution was washed three times, each time with 2500 ml of ethyl acetate, and then the aqueous layer was separated, adjusted to pH 12 with sodium hydroxide, and then extracted three times, each time with 3000 ml of ethyl acetate. The extracts were combined, washed with 550 ml of saturated saline, dehydrated with anhydrous magnesium sulfate, and then evaporated under reduced pressure to remove ethyl acetate. The residue was distilled to obtain 78.9 g of the title compound.

1. temperaturecooled to room temperature
2. customThe supernatant was removed
3. additionthe lower layer was poured onto 3500 g of ice-water
4. stirringwith stirring
5. additionhydrochloric acid was added
6. stirringthe mixture was stirred for 10 minutes
7. washThis solution was washed three times
8. customeach time with 2500 ml of ethyl acetate, and then the aqueous layer was separated
9. extractionextracted three times
10. washwashed with 550 ml of saturated saline
11. customevaporated under reduced pressure
12. customto remove ethyl acetate
13. distillationThe residue was distilled

ORD record

ord-1657bc5c259b4ae894b0eda5c7e8c27c

Source dataset

uspto-grants-2001_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06252076B1