Hydrochloric Acid → 3-[4-(Cyclopropyl-methyl-amino)-5,6,7,8-tetrahydro-[1]benzothiopheno[2,3-d]pyrimidin-2-yl]-propionic acid

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Reaction Steps

The LiOH (0.047 g, 0.0018 mol) dissolved in water (2 ml) was added to a solution of 3-[4-(cyclopropyl-methyl-amino)-5,6,7,8-tetrahydro-[1]benzothiopheno[2,3-d]pyrimidin-2-yl]-propionic acid methyl ester (0.5 g, 0.0014 mol) in THF (3 ml), and the resulting solution was stirred at R.T for 3 hrs. The reaction mixture was diluted with water, acidified with dilute HCl (up to pH 5) and extracted with ethyl acetate (3×15 ml). The combined organic layers were dried over Na2SO4, concentrated, and the crude was purified by preparative HPLC to give 0.25 g (54%) of 3-[4-(cyclopropyl-methyl-amino)-5,6,7,8-tetrahydro-[1]benzothiopheno[2,3-d]pyrimidin-2-yl]-propionic acid. 1H NMR (400 MHz, CDCl3) δ ppm=0.53 (m, 2H), 0.87 (m, 2H), 1.76 (m, 2H), 1.92 (m, 2H), 2.84 (m, 7H), 3.1 (s, 3H), 3.22 (t, 2H), 14.75 (s, 1H). LC-MS: [M+H]=331.9.

Provenance & Evidence