反应详情

According to the procedure described for 5-isopropylisoxazol-3-amine in Example 133A Step 4, 2-(2-cyclopentyl-1,3-dioxolan-2-yl)-N′-hydroxyacetimidamide (1.99 g, 93 mmol) was dissolved in ethanol (2 mL) and acidified with 37% aq. hydrochloric acid to give 5-cyclopentylisoxazol-3-amine (875 mg, 62%) as a white solid. 1H NMR (300 MHz, CDCl3) δ 5.52 (s, 1H), 3.86 (bs, 2H), 3.09-3.04 (m, 1H), 2.04 (d, 2H), 1.75-1.62 (m, 6H); LC-MS (ESI) m/z 153 (M+H)+.