Triethylamine → 3-(Chloromethyl)-1-methoxynaphthalene

Temperature

-5 °C

15.0 g (79.7 mmol) of (4-methoxy-naphthalen-2-yl)-methanol [Chem. Pharm. Bull. 19(6), 1245-1256 (1971)] were dissolved in 100 ml of dichloromethane, the solution treated with 20 ml of triethylamine, cooled to −5° C. and treated slowly with 9.3 ml (119.5 mmol) methanesulfonyl chloride. Then, the reaction mixture was stirred at room temperature for 23 hours, concentrated in a water-jet vacuum, redissolved in 80 ml of tetrahydrofuran, treated with 11.25 g of sodium hydrogen carbonate and stirred for another 2 hours. The suspension was then diluted with 500 ml of water and extracted three times with 300 ml of ethyl acetate, the organic phases were washed once with distilled water, then dried over magnesium sulphate, filtered and concentrated in a water-jet vacuum. The thus-obtained crude product was chromatographed on silica gel with pentane/dichloromethane (4/1). There were thus obtained 11.9 g (57.5 mmol), 72.5% 3-chloromethyl-1-methoxy-naphthalene as a colorless solid; MS: 206 (M)+.

1. concentrationconcentrated in a water-jet vacuum
2. dissolutionredissolved in 80 ml of tetrahydrofuran
3. additiontreated with 11.25 g of sodium hydrogen carbonate
4. stirringstirred for another 2 hours
5. additionThe suspension was then diluted with 500 ml of water
6. extractionextracted three times with 300 ml of ethyl acetate
7. washthe organic phases were washed once with distilled water
8. dry with materialdried over magnesium sulphate
9. filtrationfiltered
10. concentrationconcentrated in a water-jet vacuum
11. customThe thus-obtained crude product
12. customwas chromatographed on silica gel with pentane/dichloromethane (4/1)

ORD record

ord-00190b21218241359aa447830dbfba99

Source dataset

uspto-grants-2004_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06673931B2