我们提出了可持续的,直观的,高度区域选择性的,可见光驱动的铜催化的N-甲苯磺酰with与末端炔烃的有氧氧化级联环化反应,以在室温下制备3-芳基香豆素。这种操作简单的方法已成功应用于各种N-甲苯磺酰hydr和炔烃(49个实例),并且进展顺利,可提供具有生物活性的化合物,例如单胺氧化酶B(MAO-B)抑制剂和辣根过氧化物酶(HRP)抑制剂,在温和的条件下具有令人满意的产量。此外,机理研究表明,反应是通过铜进行的(II18 O 2同位素标记实验证明)-超氧或-过氧配合物介导的末端炔烃的氧化环化反应。
[EN] STEM CELL DIFFERENTIATING AGENTS AND USES THEREFOR<br/>[FR] AGENTS DE DIFFÉRENCIATION DE CELLULES SOUCHES ET UTILISATIONS CORRESPONDANTES
申请人:UNIV TEXAS
公开号:WO2009038879A2
公开(公告)日:2009-03-26
The present invention relates to screens for compounds that can induce stem cell differentiation. In addition, isoxazoles and sulfonyl hydrazones are identified as general classes of compounds that can induce differentiation of stem cells into cells of neuronal and cardiac fate, respectively.
Direct Access for the Regio- and Stereoselective Synthesis of <i>N</i>-Alkenylpyrazoles and Chromenopyrazoles
A highly regio- and stereoselective method was developed for the preparation of N-alkenylpyrazoles and chromenopyrazoles by the reaction of N-tosylhydrazones and salicyl N-tosylhydrazones with alkynes under neat conditions in the presence of La(OTf)3. The present study was found to be efficient and convenient for direct access to N-alkenylpyrazoles and chromenopyrazoles through C–C, C–N, and C–O bond
Visible-light-driven copper-catalyzed aerobic oxidative cascade cyclization of <i>N</i>-tosylhydrazones and terminal alkynes: regioselective synthesis of 3-arylcoumarins
first example of sustainable, intuitive, highly regioselective, visible-light-driven copper catalyzed aerobic oxidative cascade cyclization of N-tosylhydrazones with terminal alkynes for the preparation of 3-arylcoumarins at room temperature. This operationally simple methodology has been successfully applied to a wide range of N-tosylhydrazones and alkynes (49 examples), and proceeds well to afford biologically
我们提出了可持续的,直观的,高度区域选择性的,可见光驱动的铜催化的N-甲苯磺酰with与末端炔烃的有氧氧化级联环化反应,以在室温下制备3-芳基香豆素。这种操作简单的方法已成功应用于各种N-甲苯磺酰hydr和炔烃(49个实例),并且进展顺利,可提供具有生物活性的化合物,例如单胺氧化酶B(MAO-B)抑制剂和辣根过氧化物酶(HRP)抑制剂,在温和的条件下具有令人满意的产量。此外,机理研究表明,反应是通过铜进行的(II18 O 2同位素标记实验证明)-超氧或-过氧配合物介导的末端炔烃的氧化环化反应。