Ethylamine → (E)-N-ethyl-6-methoxy-6-methyl-2-hepten-4-ynylamine hydrochloride

To a solution of 232.4 ml (4.1 mol) of 70% ethylamine aqueous solution in 386 ml of tetrahydrofuran was added 43.4 ml (0.47 mol) of 1,3-dichloropropene (E/Z=9/1) under ice cooling. The solution was stirred for 2 hours at the same temperature and for one hour at room temperature. Then, 4.65 g (24.4 mmol) of copper (I) iodide, 1.74 g (9.8 mmol) of palladium chloride, 4.83 9 (18.4 mmol) of triphenylphosphine and 20.0 g (0.204 mol) of 3-methoxy-3-methyl-1-butyne were added therein under ice cooling and the mixture was stirred at 30°-40° C. for 10 hours. The solvent was distilled off under reduced pressure and the residue was extracted with 300 ml of ethyl acetate. The organic layer was washed with 100 ml of saturated sodium chloride aqueous solution and 100,ml of 10% sodium carbonate aqueous solution, and then dried over anhydrous magnesium sulfate. The organic layer was concentrated under reduced pressure and the residue was distilled under reduced pressure to obtain 47 g of slightly yellow oil at 95° C./4 mmhg. The oil was dissolved in 100 mi of dichloromethane and 94 ml of 23% hydrogen chloride methanol solution was added thereto to acidify, and then the solvent was distilled off under reduced pressure. Precipitated crystals were suspended in ether, collected by filtration, washed with ether and then dried under reduced pressure to obtain 24.4 g (yield: 55%1 of the above identified compound as slightly purple crystalline powder.

1. stirringunder ice cooling and the mixture was stirred at 30°-40° C. for 10 hours
2. distillationThe solvent was distilled off under reduced pressure
3. extractionthe residue was extracted with 300 ml of ethyl acetate
4. dry with materialdried over anhydrous magnesium sulfate
5. concentrationThe organic layer was concentrated under reduced pressure
6. distillationthe residue was distilled under reduced pressure
7. customto obtain 47 g of slightly yellow oil at 95° C./4 mmhg
8. additionwas added
9. distillationthe solvent was distilled off under reduced pressure
10. customPrecipitated crystals
11. filtrationcollected by filtration
12. washwashed with ether
13. customdried under reduced pressure
14. customto obtain 24.4 g (yield

ORD record

ord-e4e1f4c62f4c4a399ad7ff94b22b4e4f

Source dataset

uspto-grants-1994_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05296612