Copper(II) Halides Adsorbed on Alumina as Halogenating Reagent for Coumarins
作者:Prakash C. Thapliyal、Prem Kr Singh、Rajender N. Khanna
DOI:10.1080/00397919308012602
日期:1993.11
Abstract Coumarin and its derivatives have been halogenated selectively at C-3 position with copper(II) halides adsorbed on neutral alumina and halobenzene.
摘要 香豆素及其衍生物已被吸附在中性氧化铝和卤苯上的卤化铜 (II) 在 C-3 位选择性卤化。
Visible light-enabled regioselective chlorination of coumarins using CuCl<sub>2</sub><i>via</i> LMCT excitation
efficient, regioselectivechlorination of coumarins using Earth-abundant and cost-effective CuCl2 under visible light irradiation is reported. A key feature of this protocol is the photocatalytic dissociation of the copper(II) complex in acetonitrile through ligand-to-metal charge transfer (LMCT) to give the chlorine atom which then selectively chlorinates the coumarin. This method can chlorinate a broad
报道了在可见光照射下使用地球丰富且具有成本效益的 CuCl 2对香豆素进行有效的区域选择性氯化。该协议的一个关键特征是通过配体到金属电荷转移 (LMCT) 将乙腈中的铜 ( II ) 配合物光催化解离,从而产生氯原子,然后选择性地氯化香豆素。该方法可以用吸电子或给电子取代基对范围广泛的香豆素进行氯化,以区域选择性地提供 3-氯香豆素,并以良好至优异的产率进一步扩展到其他缺电子杂环和烯烃,例如黄酮、8-甲氧基补骨脂素和萘醌。
Neue Sulfonsäureester von Hydroxycumarinen, ihre Herstellung und sie enthaltende Arzneimittel
申请人:BASF Aktiengesellschaft
公开号:EP0111746B1
公开(公告)日:1987-09-16
A system for determining the electrical potential across a membrane