Tyramine → N-[2-(4-Hydroxyphenyl)ethyl]-2-methylprop-2-enimidic acid

Temperature

0 °C

12.4 Gram of 4-(2-aminoethyl)phenol and 9.15 g of triethylamine were dissolved in 100 mL of N-methylpyrrolidone, and the solution was cooled to 0° C. in a nitrogen stream. Thereto, 9.45 g of methacryloyl chloride was added dropwise over 0.2 hours, and the obtained reaction solution was stirred at 0° C. for 1 hour and further stirred at room temperature for 4 hours. After adding 500 mL of ethyl acetate, the organic layer was washed, in sequence, twice with an aqueous saturated sodium hydrogencarbonate solution and twice with water and dried over sodium sulfate. The solvent was concentrated to obtain 12.2 g of N-(4-hydroxyphenethyl)methacrylamide as a brown oil. Thereafter, 7.49 g of the oil and 11.5 g of 1,1,2,2,3,3-hexafluoropropane-1,3-disulfonyl difluoride were dissolved in 100 mL of THF, and the resulting solution was cooled to 0° C. Thereto, 4.43 g of triethylamine was added dropwise over 0.3 hours, and the obtained reaction solution was stirred at 0° C. for 1 hour and further stirred at room temperature for 3 hours. After adding 200 mL of ethyl acetate, the organic layer was washed, in sequence, twice with an aqueous saturated sodium hydrogencarbonate solution and twice with water and dried over sodium sulfate. The solvent was concentrated, and the brown oil as residue was dissolved in 100 ml of methanol. Thereto, 10 g of sodium hydrogencarbonate as solid was added, and the mixture was stirred at 50° C. for 6 hours. After adding 200 mL of ethyl acetate, the organic layer was washed, in sequence, twice with saturated brine and twice with water and dried over sodium sulfate to obtain 15.7 g of 3-((4-(2-methacrylamido)ethyl)phenoxy)sulfonyl)-1,1,2,2,3,3-hexafluoropropane-1-sulfonylfluoride as a brown oil. Thereafter, 7.29 g of this brown oil was dissolved in 100 mL of methanol, and 4.81 g of triphenylsulfonium bromide was added thereto, followed by stirring at room temperature for 3 hours. After adding 200 mL of chloroform, the organic layer was washed with water, and the solvent was concentrated, as a result, 10.1 g of a brown transparent oily compound was obtained. 1H-NMR (300 MHz, CDCl3) δ 1.91 (s, 3H), 2.87 (t, 2H), 3.50 (quartet, 2H), 5.27 (s, 1H), 5.66 (s, 1H), 6.39 (bs, 1H), 7.14 (d, 2H), 7.23 (d, 2H), 7.67-7.76 (m, 15H), 19F-NMR (300 MHz, CDCl3) δ −107.4 (m, 2F), −114.0 (m, 2F), −118.1 (m, 2F).

1. customthe obtained reaction solution
2. stirringfurther stirred at room temperature for 4 hours
3. washthe organic layer was washed, in sequence, twice with an aqueous saturated sodium hydrogencarbonate solution and twice with water
4. dry with materialdried over sodium sulfate
5. concentrationThe solvent was concentrated

ORD record

ord-6ed066d9a6ed4ea99022be6071226e27

Source dataset

uspto-grants-2015_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09051403B2