A practical protocol for the large-scale preparation of 2-diazo-1,3-dicarbonyl compounds is described by diazo-transfer reactions with tosyl azide followed by efficient chromatographic purifications on silica gel and/or alumina. diazo compounds - ketones - esters - Regitz reaction - chromatography
Metal-Triflate-Catalyzed Synthesis of Polycyclic Tertiary Alcohols by Cyclization of γ-Allenic Ketones
作者:Ilhem Diaf、Gilles Lemière、Elisabet Duñach
DOI:10.1002/anie.201310724
日期:2014.4.14
It has been established that bismuth(III) triflate catalyzes the cyclization of γ‐allenic ketones under mild reaction conditions. This reaction allows the selective formation of polycyclic tertiary alcohols from cyclic ketone derivatives. The resulting dienols can engage in stereoselective cycloadditions to efficiently afford complex polycyclic systems.
Synthesis of Polysubstituted Phenols by Rhodium‐Catalyzed C−H/Diazo Coupling and Tandem Annulation
作者:Min Liu、Kelu Yan、Jiangwei Wen、Xue Li、Xiaoyu Wang、Fengjie Lu、Xiu Wang、Hua Wang
DOI:10.1002/adsc.202001456
日期:2021.3.29
rhodium(III)‐catalyzed C−H/diazo coupling and tandem annulation of 3‐oxopent‐4‐enenitriles have been proposed for the synthesis of polysubstituted phenols. Most products of phenols are obtained in good yields. Several preliminary mechanistic studies and derivatization reactions of phenol products were also performed. This method offers an alternative approach for the synthesis of useful diverse phenols.
Regioselective synthesis of multisubstituted isoquinolones and pyridones via Rh(<scp>iii</scp>)-catalyzed annulation reactions
作者:Liangliang Shi、Ke Yu、Baiquan Wang
DOI:10.1039/c5cc05977a
日期:——
A mild and efficient Rh(III)-catalyzedregioselective synthesis of isoquinolones and pyridones has been developed. The protocol uses readily available N-methoxybenzamide or N-methoxymethacrylamide and diazo compounds as the starting materials. The...
Free‐Amine‐Directed Iridium‐Catalyzed C−H Bond Activation and Cyclization of Naphthalen‐1‐amines with Diazo Compounds Leading to Naphtho[1,8‐
<i>bc</i>
]pyridines
作者:Kelu Yan、Yongxue Lin、Yong Kong、Bin Li、Baiquan Wang
DOI:10.1002/adsc.201801598
日期:2019.4
Iridium‐catalyzed C−H activation and cyclization of naphthalen‐1‐amines with diazo compounds leading to naphtho[1,8‐bc]pyridines have been developed. Different from the previous free‐amine‐directed C−H functionalization with diazo compounds that relied on the coordination of lone pair electrons or in situ formation of imine, this transformation passes through a five‐membered iridacycle intermediate containing an
已经开发了铱催化的CH-1活化和萘-1-胺与重氮化合物的环合反应,从而生成萘[1,8- bc ]吡啶。与以前的重氮化合物基于孤对电子的配位或亚胺的原位形成的重氮化合物的游离胺定向的CH官能化不同,该转化过程通过包含N-Irσ-键的五元iridacycle中间体进行。 。它为在温和条件下合成有用的各种萘并[1,8- bc ]吡啶衍生物提供了另一种方法。