تفاعل #1747875
ord-2ebd9019e30c48799df0326dac194be3
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The compound of Formula II, 4-ally-L-tyrosine, is synthesized according to the scheme set forth in FIG. 13. A protected tyrosine, e.g., an Nboc or Fmoc protected tyrosine, is reacted with allyl bromide, resulting in a protected allyl tyrosine, which is then typically deprotected to yield 4-allyl-L-tyrosine. For example, N-(tert-Butoxycarbonyl)-L-tyrosine (2.95 g, 10 mmole) was dissolved in 80 ml of DMF. The solution was chilled to 5° C. and NaH (0.63 g, 26 mmole) was added. The reaction mixture was allowed to warm up to 10° C. and stirred for additional 2 hours. After that, allyl bromide (1.33 g, 11 mmole) was added to the mixture and reaction was warmed to room temperature. The reaction mixture was stirred for 4 hours. Water was added to work up the reaction. The aqueous layer was extracted with ethyl acetate and CH2Cl2. The organic layer was dried over anhydrous MgSO4. The organic solvent was removed to give white solid. This compound was then refluxed in 4M HCl in 1.4-dioxane for 4 hours. All the solvent was evaporated to give the desired product as white solid (1.9 g, 86%). 1HNMR (CD3OD): d ppm 3.1 (m, 2H), 4.1 (t, 1H), 4.5 (d, 2H), 5.3 (q, 1H), 5.9 (m, 1H), 6.9 (d, 2H), 7.1 (d, 2H). Calculated molecular weight: 221, obtained molecular weight: 222.