p-Chlorophenylhydrazine hydrochloride was synthesized from p-chloroaniline through diazotization followed by Na 2SO 3 reduction. The p-chloroaniline is at first diazotized in dilute hydrochloride acid and PEG-600, and...p-Chlorophenylhydrazine hydrochloride was synthesized from p-chloroaniline through diazotization followed by Na 2SO 3 reduction. The p-chloroaniline is at first diazotized in dilute hydrochloride acid and PEG-600, and then the solution of diazonium hydrochloride was reduced by droping into Na 2SO 3 solution at 70 ℃, and acided in 20%~25% of hydrochloride acid. The yield was above 84 5%(with purity≥99 5% by HPLC). The following reagent ratios were used in synthesis: n(p-chlorlaniline) ∶n(sodium nitrite)∶n(hydrochloride acid)∶n(sodium sulfite)=1 0∶ 1 02∶ 3 0∶ 2 5.展开更多
文摘p-Chlorophenylhydrazine hydrochloride was synthesized from p-chloroaniline through diazotization followed by Na 2SO 3 reduction. The p-chloroaniline is at first diazotized in dilute hydrochloride acid and PEG-600, and then the solution of diazonium hydrochloride was reduced by droping into Na 2SO 3 solution at 70 ℃, and acided in 20%~25% of hydrochloride acid. The yield was above 84 5%(with purity≥99 5% by HPLC). The following reagent ratios were used in synthesis: n(p-chlorlaniline) ∶n(sodium nitrite)∶n(hydrochloride acid)∶n(sodium sulfite)=1 0∶ 1 02∶ 3 0∶ 2 5.
文摘为建立合成塞来昔布关键中间体对肼基苯磺酰胺盐酸盐的质量标准,测定对肼基苯磺酰胺盐酸盐的含量。采用高效液相色谱法,色谱柱:Agilent ZORBAX SB-C18柱(4.6×250mm,5μm);流动相:缓冲液(1.65 g庚烷磺酸钠置于1 000 m L容量瓶中,用水溶解并稀释至刻度,用三氟乙酸调pH值至2.5)∶乙腈=88∶12;流速为1.0 m L/min;进样量为20μL;检测波长为233 nm;柱温为25℃。结果显示:该中间体的峰面积与浓度呈良好的线性关系,加样平均回收率为99.77%,相对标准偏差RSD为0.40%。结果表明,该方法方便、准确、可靠,可用于测定对肼基苯磺酰胺盐酸盐的含量。