甲基 2-氰基-2-环戊基乙酸甲酯

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of cyano-cyclopentylidene-acetic acid methyl ester (20.8 g, 126 mmol) in acetonitrile (500 mL) was added nitromethane (34 mL, 630 mmol, 5 eq) followed by dropwise addition of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) (18.8 mL, 126 mmol). The reaction solution turned orange upon the addition of DBU. The reaction mixture was stirred at room temperature for 16 hours. Another portion of DBU (1 mL) was added and stirred for 1 hour. The reaction mixture was partitioned between ether (1 L) and 1N HCl (400 mL) and the layers separated. The organic layer was washed with 1N HCl (2×300 mL), brine (2×200 mL), dried over sodium sulfate, filtered and evaporated. The residue was chromatographed on a wet-packed silica gel column eluting with 4–6% ethyl acetate/hexanes. The appropriate fractions were combined and evaporated to furnish 14.0 g (62%) of 1-cyano-spiro[2.4]heptane-1-carboxylic acid methyl ester as a clear oil: 1H NMR (300 MHz, CDCl3) δ 1.64 (d, J=5.0 Hz, 1H), 1.70–1.88 (m, 7H), 2.14 (d, J=5.0 Hz, 1H), 2.1–2.19 (m, 1H), 3.82 (s, 3H); MS (APCI) m/z 180 [M+H]+. stirred for 1 hour The reaction mixture was partitioned between ether (1 L) and 1N HCl (400 mL) the layers separated The organic layer was washed with 1N HCl (2×300 mL), brine (2×200 mL) dried over sodium sulfate filtered evaporated The residue was chromatographed on a wet-packed silica gel column eluting with 4–6% ethyl acetate/hexanes evaporated

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of cyano-cyclopentylidene-acetic acid methyl ester (20.8 g, 126 mmol) in acetonitrile (500 mL) was added nitromethane (34 mL, 630 mmol, 5 eq) followed by dropwise addition of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) (18.8 mL, 126 mmol). The reaction solution turned orange upon the addition of DBU. The reaction mixture was stirred at room temperature for 16 hours. Another portion of DBU (1 mL) was added and stirred for 1 hour. The reaction mixture was partitioned between ether (1 L) and 1N HCl (400 mL) and the layers separated. The organic layer was washed with 1N HCl (2×300 mL), brine (2×200 mL), dried over sodium sulfate, filtered and evaporated. The residue was chromatographed on a wet-packed silica gel column eluting with 4–6% ethyl acetate/hexanes. The appropriate fractions were combined and evaporated to furnish 14.0 g (62%) of 1-cyano-spiro[2.4]heptane-1-carboxylic acid methyl ester as a clear oil: 1H NMR (300 MHz, CDCl3) δ 1.64 (d, J=5.0 Hz, 1H), 1.70–1.88 (m, 7H), 2.14 (d, J=5.0 Hz, 1H), 2.1–2.19 (m, 1H), 3.82 (s, 3H); MS (APCI) m/z 180 [M+H]+. stirred for 1 hour The reaction mixture was partitioned between ether (1 L) and 1N HCl (400 mL) the layers separated The organic layer was washed with 1N HCl (2×300 mL), brine (2×200 mL) dried over sodium sulfate filtered evaporated The residue was chromatographed on a wet-packed silica gel column eluting with 4–6% ethyl acetate/hexanes evaporated

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of cyano-cyclopentylidene-acetic acid methyl ester (20.8 g, 126 mmol), in acetonitrile (500 mL) was added nitromethane (34 mL, 630 mmol, 5 eq) followed by dropwise addition of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) (18.8 mL, 126 mmol). The reaction solution turned orange upon the addition of DBU. The reaction mixture was stirred at room temperature for 16 hours. Another portion of DBU (1 mL) was added and stirred for 1 hour. The reaction mixture was partitioned between ether (1 L) and 1N HCl (400 mL) and the layers separated. The organic layer was washed with 1N HCl (2×300 mL), brine (2×200 mL), dried over sodium sulfate, filtered and evaporated. The residue was chromatographed on a wet-packed silica gel column eluting with 4-6% ethyl acetate/hexanes. The appropriate fractions were combined and evaporated to furnish 14.0 g (62%) of 1-cyano-spiro[2.4]heptane-1-carboxylic acid methyl ester as a clear oil: 1H NMR (300 MHz, CDCl3) δ 1.64 (d, J=5.0 Hz, 1H), 1.70-1.88 (m, 7H), 2.14 (d, J=5.0 Hz, 1H), 2.1-2.19 (m, 1H), 3.82 (s, 3H); MS (APCI) m/z 180 [M+H]+. stirred for 1 hour The reaction mixture was partitioned between ether (1 L) and 1N HCl (400 mL) the layers separated The organic layer was washed with 1N HCl (2×300 mL), brine (2×200 mL) dried over sodium sulfate filtered evaporated The residue was chromatographed on a wet-packed silica gel column eluting with 4-6% ethyl acetate/hexanes evaporated