acid catalytic system has been established, providing a direct approach for the preparation of diversesubstituted quinoline derivatives in high yields with wide functional group tolerance. Practically, the protocol can be easily scaled up to gram-scale and was utilized in the concise formal synthesis of a promising herbicide candidate.
Catalytic Asymmetric Cascade Using Spiro-Pyrrolidine Organocatalyst: Efficient Construction of Hydrophenanthridine Derivatives
作者:Jin-Miao Tian、Yong-Hai Yuan、Yu-Yang Xie、Shu-Yu Zhang、Wen-Qiang Ma、Fu-Min Zhang、Shao-Hua Wang、Xiao-Ming Zhang、Yong-Qiang Tu
DOI:10.1021/acs.orglett.7b03330
日期:2017.12.15
(spiro-pyrrolidine) organocatalyst has been demonstrated to enable an asymmetric aza-Michael/Michael/aldol cyclization cascade, in which two six-membered rings (B/C) and three stereocenters have been constructed in a catalytic one-step process. It is so far the most efficient method for construction of hydrophenanthridine derivatives featuring high enantioselectivity. The trans- or cis-fused B/C-rings
已证明新开发的SPD(螺吡咯烷)有机催化剂可实现不对称的aza-Michael / Michael / aldol环化级联反应,在该催化反应中,两个六元环(B / C)和三个立体中心被构建步骤过程。迄今为止,这是构建具有高对映选择性的氢菲啶衍生物的最有效方法。的反式-或顺式-融合B / C环可以选择性地在一个基片控制的方式组装。此外,该级联反应可以放大至克级,而不会损失对映选择性。
Au-doped TiO2 nanoparticles for selective photocatalytic synthesis of quinaldines from anilines in ethanol
作者:K. Selvam、M. Swaminathan
DOI:10.1016/j.tetlet.2010.07.071
日期:2010.9
A convenient eco-friendly photocatalytic synthesis of quinaldines has been developed by a simple one-pot reaction of anilines in ethanol solution with Au-loaded TiO2 under UV irradiation. Upon irradiation in the presence of Au-TiO2, aniline and oxidation products derived from ethanol undergo condensation–cyclization to afford quinaldines.
Nanosized platinum particles loaded on the TiO2 nanoparticles were prepared to assess its photocatalytic activity in simple one-pot synthesis of quinaldines from anilines in ethanol using UV light. The catalyst was characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy, X-ray photoelectron spectra (XPS), Brunauer–Emmer–Teller surface area, atomic force microscope