2-Aminothiazole → 1-methyl-1H-pyrrole-2-ethylamine

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An isothiocyanate of 2-(2-aminoethyl)-1-methylpyrrole was prepared according to Ann 657, 104-107 (1962). 1H-NMR (CDCl3) δ2.95 (t, 2H), 3.55 (s, 1H), 3.65 (t, 2H), 5.9-5.95 (m, 1H), 6.05 (t, 1H), 6.55 (t, 1H). This isothiocyanate was dissolved in DMF (4 ml). To this solution was added 200 mg (2 mmol) of 2-aminothiazole and the solution was heated at 100° C. for about 16 h. EtOAc was added and the organic phase was washed with sat. NH4Cl-solution and brine. After drying (Na2SO4), the product was purified on a silica gel column, using EtOAc/Hexane 1:1, as eluent. This gave almost pure titled product. Recrystallization from toluene/hexanes gave 150 mg of the titled product.

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