An improved and scalable synthesis of zolpidem via a CuI/BINOL-mediated tandem reaction of imine and alkyne

An improved and scalable synthesis of zolpidem via a CuI/BINOL-mediated tandem reaction of imine and alkyne
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通过亚胺和炔的 CuI/BINOL 介导的串联反应改进和可扩展地合成唑吡坦

DOI:
10.1515/hc-2017-0152
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发表时间:
2017-12
影响因子:
2.3
通讯作者:
Lei XS
Lei XS
中科院分区:
化学4区
文献类型:
--
作者:
Zhang Bingbing;Shan Guangsheng;Ma Qiaoning;Xu Qianqian;Lei Xinsheng;Lei XS

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摘要改进了催眠药唑吡坦(1)的合成方法,建立了一种可扩展的合成方法。在CuI/BINOL的存在下,亚胺和丙醇胺之间的两步串联反应被描述。CuI/BINOL是串联反应的有效促进剂。以54%的分离收率有效地制备了唑吡坦,用简单的结晶法以37%的产率得到了唑吡坦的半酒石酸盐,而不需要繁琐的柱层析。该过程可扩大到10克。中间体亚胺5的分离使1-亚胺的产率提高到83%。
Abstract An improved and scalable method for the synthesis of zolpidem (1), a hypnotic drug, was developed. A two-step sequence involving imine formation and subsequent tandem reaction between an imine and propiolamide in the presence of CuI/BINOL, an efficient promoter for the tandem reaction, is described. Zolpidem was efficiently prepared in a 54% isolated yield and the hemitartrate salt of zolpidem was produced in 37% yield by simple crystallization, without tedious column chromatography. The procedure can be scaled up to >10 g. The yield of 1 increased to 83% following isolation of the intermediate imine 5.
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