Hydrochloric Acid → 5-((R)-1-carboxy-2-((2E,6E)-3,7,11-trimethyldodeca-2,6,10-trienylthio)ethylamino)-5-oxopentanoic acid

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S-trans, trans-Farnesyl-L-cysteine (500 mg, 1.54 mmol) was dissolved in mixture of THF (6 mL) and first portion of K2CO3 (3 mmol) and the resulting solution was cooled to 5° C. with vigorous stirring. To this stirred solution glutaric anhydride (263 mg, 2.30 mmol) was added slowly while maintaining the pH at 9.0-9.5 with another portion of K2CO3 (3 mmol). The mixture was stirred at RT for 3 h, TLC showed completion of the reaction. The pH of the reaction mixture then adjusted to 2.0 by the addition of 2 N hydrochloric acid. The acidic solution was extracted with ethyl acetate (10 mL×3). The combined organic extract was washed with water, brine and dried over Na2SO4, the solvent was removed on rotary evaporator to afford crude Compound E, which was further purified by preparative HPLC (459 mg, 68%) to yield Compound E. 1H-NMR (500 MHz, CD3OD): δ 1.60 (s, 6H), 1.70 (s, 3H), 1.72 (s, 3H), 2.02-1.95 (m, 4H), 2.15-2.05 (m, 4H), 2.32 (t, 2H), 2.40 (t, 2H), 2.75 (m, 2H), 3.05 (dd, 1H), 3.15 (dd, 1H), 3.30 (d, 2H), 4.60 (dd, 1H), 5.14 (t, 2H), 5.25 (t, 1H). 13C-NMR (125 MHz, CD3OD): δ 16.1, 17.7, 18.4, 22.2, 26.3, 27.4, 27.7, 35.7, 40.6, 53.3, 121.5, 125.2, 125.4, 131.8, 136.1, 140.1, 173.7, 175.3, 177.6; ES-MS: mass calcd for Chemical Formula: C23H32NO5S 439.6. Found (M+Na) m/z 462.3.

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