(+/-)-(5-chloro-7-hydroxy-2-methyl-2,3-dihydro-1-benzofuran-2-yl)methyl 4-methylbenzenesulfonate 、
三氟甲磺酸酐 、
N,N-二异丙基乙胺 、 (+/-)-(6-phenyl-2,3-dihydro-1-benzofuran-2-yl)methyl 4-methylbenzenesulfonate 以provided 13.0 g (82%) of (±)-(5-chloro-2-methyl-7-{[(trifluoromethyl)sulfonyl]oxy}-2,3-dihydro-1-benzofuran-2-yl)methyl 4-methylbenzenesulfonate as a white solid的产率得到(+/-)-(5-chloro-2-methyl-7-{[(trifluoromethyl)sulfonyl]oxy}-2,3-dihydro-1-benzofuran-2-yl)methyl 4-methylbenzenesulfonate