| 摘要 |
PURPOSE: A method for preparing chromane and dihydrobenzopyrane is provided to selectively obtain various chromane derivatives. CONSTITUTION: A method for preparing chromane derivative of chemical formula 4 comprises a step of reacting a compound of chemical formula 2 with a compound of chemical formula 3 under the presence of an organic catalyst of chemical formula 1. In chemical formula 2, X is a hydrogen, methyl group, methoxy group, cyano group, halogen group. The chromane derivative is an R-isomer. |
