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发明授权
CN106938995B 一种眼科药物苯磺酸贝他斯汀的不对称合成方法 有权

一种眼科药物苯磺酸贝他斯汀的不对称合成方法
摘要：
本发明涉及眼科药物苯磺酸贝他斯汀不对称的合成方法，具体将(4‑氯苯基)(2‑吡啶基)甲酮氧化得到(4‑氯苯基)(2‑吡啶基)甲酮‑N‑氧化物；用单磺酰手性二胺与金属钌、铑、铱的配合物作催化剂，甲酸钠、或者甲酸与三乙胺的混合物、或者异丙醇为氢源，通过不对称转移氢化还原(4‑氯苯基)(2‑吡啶基)甲酮‑N‑氧化物制备(S)‑(4‑氯苯基)(2‑吡啶基)甲醇‑N‑氧化物；将(S)‑(4‑氯苯基)(2‑吡啶基)甲醇‑N‑氧化物还原制备(S)‑(4‑氯苯基)(2‑吡啶基)甲醇；(S)‑(4‑氯苯基)(2‑吡啶基)甲醇与4‑(4‑溴哌啶‑1‑基)丁酸乙酯缩合得到眼科药物苯磺酸贝他斯汀，总产率61.6%。
摘要（英）：

The invention relates to an asymmetric synthesis method of an ophthalmologic drug pylistramine besylate. The method concretely comprises the following steps: oxidizing (4-chlorophenyl)(2-pyridyl)methanone to obtain (4-chlorophenyl)(2-pyridyl)ketone-N-oxide; carrying out asymmetric transfer hydrogenation reduction on the (4-chlorophenyl)(2-pyridyl)ketone-N-oxide through using a complex of monosulfonyl chiral diamine and metallic ruthenium, rhodium and iridium as a catalyst and a sodium formate or formic acid and triethylamine mixture or isopropanol as a hydrogen source in order to prepare (S)-(4-chlorophenyl)(2-pyridyl)methanol-N-oxide; reducing the (S)-(4-chlorophenyl)(2-pyridyl)methanol-N-oxide to prepare (S)-(4-chlorophenyl)(2-pyridyl)methanol; and condensing the (S)-(4-chlorophenyl)(2-pyridyl)methanol and ethyl 4-(4-bromopiperidine-1-yl)butyrate to obtain the ophthalmologic drug pylistramine besylate. The total yield is 61.6%.

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