7-bromo-2-(hydroxymethyl)-2,3-dihydrobenzofuran-5-carbonitrile 、
对甲苯磺酰氯 、 (+/-)-[7-chloro-4-(trifluoromethyl)-2,3-dihydro-1-benzofuran-2-yl]methyl 4-methylbenzenesulfonate 以gave 1.5 g (72%) of (±)-(7-bromo-5-cyano-2,3-dihydro-1-benzofuran-2-yl)methyl 4-methylbenzenesulfonate as a white solid的产率得到(+/-)-(7-bromo-5-cyano-2,3-dihydro-1-benzofuran-2-yl)methyl 4-methylbenzenesulfonate