A Versatile New Synthetic Route to 1<i>N</i>-Hydroxyindazoles
作者:Fredrik Lehmann、Tobias Koolmeister、Luke R. Odell、Martin Scobie
DOI:10.1021/ol902085k
日期:2009.11.5
A new and versatile cyclization reaction affording rare 1N-hydroxyindazoles is presented. Treatment of 2-nitrobenzylamines with methanolic sodium hydroxide furnishes 1N-hydroxyindazoles regioselectively and in high yield. The reaction tolerates a range of functional groups and electronic effects.
Highly Enantioselective Synthesis of Indazoles with a C3-Quaternary Chiral Center Using CuH Catalysis
作者:Yuxuan Ye、Ilia Kevlishvili、Sheng Feng、Peng Liu、Stephen L. Buchwald
DOI:10.1021/jacs.0c04286
日期:2020.6.10
reaction of 1H-N-(benzoyloxy)indazoles using CuH catalysis. A variety of C3-allyl 1H-indazoles with quaternary stereocenters were efficiently prepared with high levels of enantioselectivity. Density functional theory (DFT) calculations were performed to explain the reactivity differences between indazole and indole electrophiles, the latter of which was used in our previously reported method. The calculations
Synthesis of 3‐(2‐Hydroxyaryl)indazole Derivatives through Radical
<i>O</i>
‐Arylation and [3,3]‐Rearrangement from
<i>N</i>
‐Hydroxyindazoles and Diaryliodonium Salts
作者:Shu‐Min Nie、Xu Zhang、Zhi‐Xin Wang、Gui‐Fa Su、Cheng‐Xue Pan、Dong‐Liang Mo
DOI:10.1002/adsc.202200569
日期:2022.11.22
A variety of functionalized 3-(2-hydroxyaryl)indazoles and N-(tetrahydrofuran-2-yl)-3-(2-hydroxyaryl)indazoles were prepared in moderate to good yields through a transition metal-free radical O-arylation and sequential [3,3]-rearrangement cascade strategy from N-hydroxyindazoles and diaryliodonium salts. The equivalents of diaryliodonium salts controlled the formation of the product structures. Mechanistic