反应详情

A slurry of 10 g (25 mmol) of 1-aminomethyl-5,6-dimethoxy-3-phenyl-3,4-dihydronaphthalene hydrochloride, from Step 2, in 150 mL of 1,2-dichloroethane was cooled to 10° C. under a nitrogen atmosphere. Boron trichloride was passed through the reaction mixture until 27 g (230 mmol) had been added. The reaction mixture was allowed to warm to ambient temperature and stirred for 18 h. The reaction mixture was then cooled in ice and 100 mL of methanol was added dropwise. The reaction mixture was again allowed to warm to ambient temperature and concentrated in vacuo. Twice, 500 mL portions of methanol were added to the residue and it was reconcentrated. The resultant foam was dissolved in 40 mL of ethanol, filtered and the solution was treated with 40 mL of methylene chloride and 80 mL of heptane. Off-white crystals of 1-aminomethyl-5,6-dihydroxy-3-phenyl-3,4-dihydronaphthalene hydrochloride (5.1 g, 56% yield) were collected by filtration, m.p. 204°-205° C. The 1H NMR spectrum was identical to the spectrum for the product of Example 2A.

1. additionhad been added
2. temperatureThe reaction mixture was then cooled in ice
3. temperatureto warm to ambient temperature
4. concentrationconcentrated in vacuo
5. additionTwice, 500 mL portions of methanol were added to the residue and it
6. dissolutionThe resultant foam was dissolved in 40 mL of ethanol
7. filtrationfiltered
8. additionthe solution was treated with 40 mL of methylene chloride and 80 mL of heptane