4
H
‐1‐Benzopyrans by a tandem S
N
2‐S
N
Ar reaction
摘要:
Abstractmagnified imageTreatment of 2‐fluoro‐5‐nitrobenzyl bromide with active methylene compounds in the presence of excess potassium carbonate in acetone leads to the formation of highly functionalized 4H‐1‐benzopyrans by a tandem SN2‐SNAr reaction sequence. The reaction works well with β‐keto esters, β‐keto sulfones, β‐keto phosphine oxides, β‐keto phosphonates and β‐keto nitriles. The reaction is simple to perform and affords products in 50‐92% yields.
4
<i>H</i>
‐1‐Benzopyrans by a tandem S
<sub>N</sub>
2‐S
<sub>N</sub>
Ar reaction
作者:Richard A. Bunce、David Rogers、Takahiro Nago、Scott A. Bryant
DOI:10.1002/jhet.5570450238
日期:2008.3
Abstractmagnified imageTreatment of 2‐fluoro‐5‐nitrobenzyl bromide with active methylene compounds in the presence of excess potassium carbonate in acetone leads to the formation of highly functionalized 4H‐1‐benzopyrans by a tandem SN2‐SNAr reaction sequence. The reaction works well with β‐keto esters, β‐keto sulfones, β‐keto phosphine oxides, β‐keto phosphonates and β‐keto nitriles. The reaction is simple to perform and affords products in 50‐92% yields.