N-Donor ligand activation of titanocene for the Biginelli reaction via the imine mechanism.

N-Donor ligand activation of titanocene for the Biginelli reaction via the imine mechanism.
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通过亚胺机制激活 Biginelli 反应中二茂钛的 N 供体配体

DOI:
10.1039/c8ra01208c
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发表时间:
2018-02-23
期刊:
影响因子:
3.9
通讯作者:
Gao, Ziwei
Gao, Ziwei
中科院分区:
化学3区
文献类型:
--
作者:
Zheng, Shaohua;Jian, Yajun;Xu, Shan;Wu, Ya;Sun, Huaming;Zhang, Guofang;Zhang, Weiqiang;Gao, Ziwei

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在醇溶剂中,用N-配体脲对稳定的二氯二茂钛(Cp_2TiCl_2)进行活化,生成Ti(IV)物种[(MeO)_2Ti(NHCONH_2)]~+,其存在通过ESI-MS、ESI-MS/MS和NMR得到证实。在新生成的Ti(iv)物种的催化下,通过三组分Biginelli反应生成了大量的3,4-二氢嘧啶-2-(1H)-酮。进一步的机理研究表明,Biginelli反应是通过亚胺途径进行的。
The remarkable activation of stable titanocene dichloride (Cp2TiCl2) was achieved using N-donor ligand urea in an alcoholic solvent, leading to the formation of a Ti(iv) species [(MeO)2Ti(NHCONH2)]+, the existence of which was verified by ESI-MS, ESI-MS/MS, and NMR. Catalyzed by the newly formed Ti(iv) species, a myriad of 3,4-dihydropyrimidin-2-(1H)-ones were produced via a three-component Biginelli reaction. Further mechanistic investigation indicated that the Biginelli reaction had taken place via the imine route.
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发表时间: 2003-04-14
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