2-(6-chloro-3,4-dihydro-1(2H)-benzopyran-4-yl)ethanol 、
Lithium aluminium hydride 、
ethyl (6-chloro-3,4-dihydro-1(2H)-benzopyran-4-yl)ethanoate 以
四氢呋喃 为溶剂,
以2-(6-methoxy-3,4-dihydro-1(2H)-benzopyran-4-yl)ethanol (5.5 g) is thus obtained in the form of a colourless oil的产率得到(4RS)-2-(6-Methoxychroman-4-yl)ethanol