3-tert-butylcyclopentan-1-one

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A mixture of 1-(5-bromo-2-hydroxy-phenyl)-ethanone (573 mg, 2.68 mmol), 3-tert-butylcyclopentanone (750 g, 5.36 mol) and pyrrolidine (362 mg, 5.092 mol) in methanol was refluxed overnight. The reaction mixture was removed in vacuo. The residue was diluted with an equal volume of H2O and then added HCl until pH=1. The mixture was extracted with EtOAc. The organic layer was dried over anhydrous Na2SO4, filtered, and evaporated to give 6-bromo-3′-tert-butylspiro[chroman-2,1′-cyclopentan]-4-one (0.8 g, 89%). 1H NMR (CDCl3): 0.77 (s, 9H), 1.34 (m, 1H), 1.48 (m, 2H), 1.63 (m, 2H), 1.81 (m, 2H), 2.09 (m, 2H), 2.72 (m, 2H), 6.73 (t, 1H), 7.47 (d, 1H), 7.89 (s, 1H). was refluxed overnight The reaction mixture was removed in vacuo The residue was diluted with an equal volume of H2O The mixture was extracted with EtOAc The organic layer was dried over anhydrous Na2SO4 filtered evaporated

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A suspension of the 3-tert-butyl-6-hydroxyhexanoic acid (1 g, 4.95 mmol), anhydrous NaOAc (0.321 g, 3.91 mmol) and acetic anhydride was refluxed for 5 hours during which time the solution mixture turned black. After the reaction mixture was cooled to room temperature, the formed acetic acid and remaining acetic anhydride were removed on a rotary evaporator and then under high vacuum. The residue was then dissolved in ethyl acetate, filtered through a plug of celite to remove the precipitate NaOAc, and concentrated in vacuo to give the crude product of 3-tert-butylcyclopentanone (0.557 g, 58%). was refluxed for 5 hours during which time the solution mixture were removed on a rotary evaporator The residue was then dissolved in ethyl acetate filtered through a plug of celite to remove the precipitate NaOAc concentrated in vacuo

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A mixture of 1-(5-bromo-2-hydroxy-phenyl)-ethanone (573 mg, 2.68 mmol), 3-tert-butylcyclopentanone (750 g, 5.36 mol) and pyrrolidine (362 mg, 5.092 mol) in methanol was refluxed overnight. The reaction mixture was removed in vacuo. The residue was diluted with an equal volume of H2O and then added HCl until pH=1. The mixture was extracted with EtOAc. The organic layer was dried over anhydrous Na2SO4, filtered, and evaporated to give 6-bromo-3′-tert-butylspiro[chroman-2,1′-cyclopentan]-4-one (0.8 g, 89%). 1H NMR (CDCl3): 0.77 (s, 9H), 1.34 (m, 1H), 1.48 (m, 2H), 1.63 (m, 2H), 1.81 (m, 2H), 2.09 (m, 2H), 2.72 (m, 2H), 6.73 (t, 1H), 7.47 (d, 1H), 7.89 (s, 1H). was refluxed overnight The reaction mixture was removed in vacuo The residue was diluted with an equal volume of H2O The mixture was extracted with EtOAc The organic layer was dried over anhydrous Na2SO4 filtered evaporated

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A suspension of the 3-tert-butyl-6-hydroxyhexanoic acid (1 g, 4.95 mmol), anhydrous NaOAc (0.321 g, 3.91 mmol) and acetic anhydride was refluxed for 5 hours during which time the solution mixture turned black. After the reaction mixture was cooled to room temperature, the formed acetic acid and remaining acetic anhydride were removed on a rotary evaporator and then under high vacuum. The residue was then dissolved in ethyl acetate, filtered through a plug of celite to remove the precipitate NaOAc, and concentrated in vacuo to give the crude product of 3-tert-butylcyclopentanone (0.557 g, 58%). was refluxed for 5 hours during which time the solution mixture were removed on a rotary evaporator The residue was then dissolved in ethyl acetate filtered through a plug of celite to remove the precipitate NaOAc concentrated in vacuo