反应详情

A mixture of 3-isopropylcyclopentanone (0.5 g, 3.962 mmol), 1-(5-bromo-2-hydroxyphenyl)ethanone (0.424 g, 1.98 mmol) and pyrrolidine (0.143 g, 1.98 mmol) in MeOH (25 mL) was refluxed overnight. The solvent was removed in vacuo to give crude 6-bromo-3′-isopropylspiro[chroman-2,1′-cyclopentan]-4-one (500 mg, 79%). 1H-NMR (CDCl3): 0.78 (m, 3H), 0.82 (m, 3H), 1.34 (m, 1H), 1.58 (m, 3H), 1.75 (m, 1H), 1.91 (m, 2H), 2.08 (m, 1H0, 2.73 (s, 2H), 6.74 (m, 1H), 7.44 (m, 1H), 7.89 (d, 1H).

1. temperaturewas refluxed overnight
2. customThe solvent was removed in vacuo