Process for the preparation of 7-alkyl-10-hydroxy-20(S)-camptothecin
    1.
    发明授权
    Process for the preparation of 7-alkyl-10-hydroxy-20(S)-camptothecin 有权
    制备7-烷基-10-羟基-20(S) - 喜树碱的方法

    公开(公告)号:US07151179B2

    公开(公告)日:2006-12-19

    申请号:US10844225

    申请日:2004-05-12

    IPC分类号: C07D405/14

    CPC分类号: C07D491/22

    摘要: The key intermediate in any synthesis of Irinotecan is 7-ethyl-10-hydroxy-20(S)-camptothecin. A process for the efficient synthesis of this intermediate is demonstrated proceeding through readily available 20(S)-camptothecin. Various other tecan compounds may be made by use of corresponding 7-alkyl-10-hydroxy-20(S)-camptothecin intermediates.

    摘要翻译: 任何伊立替康合成中的关键中间体是7-乙基-10-羟基-20(S) - 喜树碱。 证明通过容易获得的20(S) - 喜树碱进行有效合成该中间体的方法。 可以通过使用相应的7-烷基-10-羟基-20(S) - 喜树碱中间体制备各种其它tecan化合物。

    Power supply switch circuit with current leakage protection
    9.
    发明申请
    Power supply switch circuit with current leakage protection 审中-公开
    电源开关电路带有漏电保护

    公开(公告)号:US20070040452A1

    公开(公告)日:2007-02-22

    申请号:US11330158

    申请日:2006-01-12

    申请人: Yung-Fa Chen

    发明人: Yung-Fa Chen

    IPC分类号: G06F13/40

    摘要: A power supply switch circuit with current leakage protection is used in an electronic device, and is able to prevent the erroneous actions caused by a leakage current in high-temperature environments. The power supply switch circuit comprises a transistor having an emitter, a base and a collector, a field effect transistor having a drain, a source and a gate, and at least two series-connected diodes. The emitter is connected to a voltage source. The collector is connected to a load via a forward biased diode. The drain receives a trigger signal. The source is connected a reference terminal via at least two series-connected diodes. The gate is connected to the collector via a second resistor. One terminal of a third resistor is connected to the gate, and the other terminal is connected to the reference terminal.

    摘要翻译: 在电子设备中使用具有电流泄漏保护的电源开关电路,并且能够防止在高温环境中由漏电流引起的错误动作。 电源开关电路包括具有发射极,基极和集电极的晶体管,具有漏极,源极和栅极以及至少两个串联连接的二极管的场效应晶体管。 发射极连接到电压源。 集电极通过正向偏置二极管连接到负载上。 漏极接收触发信号。 源极通过至少两个串联连接的二极管连接参考端。 栅极通过第二个电阻连接到集电极。 第三电阻器的一个端子连接到栅极,另一个端子连接到参考端子。