Stereoselective Nitration of Olefins with tBuONO and TEMPO: Direct Access to Nitroolefins under Metal-free Conditions
摘要:
Nitroolefins are essential elements for both synthetic chemistry and medicinal research. Despite significant improvements in nitration of olefin an efficient metal-free synthesis remains elusive so far. Herein, we disclose a new set of reagents to access nitroolefins in a single step under metal-free conditions. A wide range of olefins with diverse functionalities has been nitrated in synthetically useful yields. This transformation is operationally simple and exhibits excellent E-selectivity. Furthermore, site selective nitration in a complex setup makes this method advantageous.
[EN] 17a-HYDROXYLASE/C17,20-LYASE INHIBITORS<br/>[FR] INHIBITEURS DE LA 17?-HYDROXYLASE/C17,20-LYASE
申请人:NOVARTIS AG
公开号:WO2012035078A1
公开(公告)日:2012-03-22
The present invention provides compounds of Formula (I), or a pharmaceutically acceptable salt thereof, where R1, R2, R3, R4, R5, R6, A and n are as defined herein. A deuteriated derivative of the compound of Formula (I) is also provided.
The present invention provides compounds of Formula (I), or a pharmaceutically acceptable salt thereof, where R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, A and n are as defined herein. A deuteriated derivative of the compound of Formula (I) is also provided.
Metal‐free Synthesis of
<scp>β‐Nitrostyrenes</scp>
via
<scp>DDQ‐Catalyzed</scp>
Nitration
作者:Sangwoon Park、Seungri Yoon、Sun‐Joon Min
DOI:10.1002/bkcs.12232
日期:2021.3
In this study, we have developed a facile synthesis of (E)‐β‐nitrostyrenes by using tert‐butyl nitrite as a source of nitro group and DDQ as a key oxidant under aerobic condition. This process highlighted that a wide range of β‐nitrostyrenes could be synthesized undermild metal‐free reaction conditions at room temperature starting from readily available styrenes.
Ferric nitrate with catalytic TEMPO has been identified as a useful reagent for regio- and stereoselective nitration of a wide variety of aromatic, aliphatic, and heteroaromatic olefins. This reaction provided nitroolefins in preparatively useful yields with excellent E-selectivity. Due to its mild nature and operational simplicity, the present protocol is expected to find application in synthetic setup.