反应详情

To a solution of t-butyl 1-(4-chlorobutyl)-1-cyclopropanecarboxylate (104a, 10.6 g, 45.7 mmol) in 2-butanone (50 mL) was added NaI (8.23 g, 54.5 mmol). The reaction mixture was stirred under reflux overnight, diluted with Et2O (100 mL), washed with a mixture of H2O (100 mL) and aqueous Na2S2O4 (0.5 M, 10 mL) and brine (50 mL) and dried to give 105a (14.8 g, 94% pure by GC, 94%) as a slightly yellow liquid. 1H NMR: δ 3.18 (t, J=6.9 Hz, 2H), 1.76 (quintet, J=7.1 Hz, 2H), 1.62-1.45 (m, 4H), 1.43 (s, 9H), 1.12 (dd, J=6.7 Hz, 3.8 Hz, 2H), 0.60 (dd, J=6.6 Hz, 3.9 Hz, 2H). 13C NMR: δ 173.9, 80.0, 33.8, 33.3, 28.9, 28.2 (3×), 24.2, 15.5 (2×), 7.2. HRMS calcd for C12H21IO2 (M4): 324.0587, found: 324.0587. Ethyl 1-(4-iodobutyl)-1-cyclobutanecarboxylate (105b). Compound 105b was prepared, likewise the procedure described for 5a, starting from ethyl 1-(4-chlorobutyl)-1-cyclobutanecarboxylate (104b, 21.21 g, 97.0 mmol) and NaI (19.07 g, 127 mmol) to give 105b (29.91 g, 99%) as a slightly yellow oil. 1H NMR: δ 4.14 (q, J=7.1 Hz, 2H), 3.17 (t, J=6.9 Hz, 2H), 2.49-2.32 (m, 2H), 1.98-1.69 (m, 8H), 1.37-1.19 (m, 2H), 1.27 (t, J=7.1 Hz, 3H). 13C NMR: δ 176.5, 60.3, 47.5, 36.9, 33.7, 30.1 (2×), 26.0, 15.7, 14.5, 6.8.

1. temperatureunder reflux overnight
2. washwashed with a mixture of H2O (100 mL) and aqueous Na2S2O4 (0.5 M, 10 mL) and brine (50 mL)
3. customdried