This invention relates to a process for the preparation of empagliflozin comprising lithiation of (3S)-3-[4-(5-bromo-2-chlorobenzyl)phenoxy]tetrahydrofuran using lithium reagent, coupling the lithiated anion species with (3R,4S,5R,6R)-3,4,5-tris[(trimethylsilyl)oxy]-6-[(trimethylsilyl)oxy]methyl}tetrahydro-2H-pyran-2-one and reducing the product methyl 1-C-(4-chloro-3-4-[(3S)-tetrahydrofuran-3-yloxy]benzyl}phenyl)-α-D-glucopyranoside] using triethylsilane and boron trifluoride diethyl etherate and optionally purifying the crude product, wherein the reduction is conducted in the presence of molecular sieves.
本发明涉及一种制备替格列净(empagliflozin)的工艺,包括使用
锂试剂对(3S)-3-[4-(5-
溴-2-
氯苄基)苯氧基]
四氢呋喃进行石
炭化反应,将石
炭化阴离子与(3R、4S,5R,6R)-3,4,5-三[(三甲基
硅)氧基]-6-[(三甲基
硅)氧基]甲基}四氢-
2H-吡喃-2-酮偶联,并用三乙基
硅烷和
硼还原产物甲基 1-C-(4-
氯-3-4-[(3S)-
四氢呋喃-3-基氧基]苄基}苯基)-α-
D-吡喃葡萄糖苷]。使用三乙基
硅烷和
三氟化硼二
乙基醚,并选择性地纯化粗产品,其中还原是在
分子筛存在下进行的。