.alpha.-Heterosubstituted phosphonate carbanions. 11. Benzoins via an acyl anion equivalent. Novel one-pot preparation of benzo[b]furans via benzoins using hydriodic acid
<i>ortho</i>
‐Oxygenative 1,2‐Difunctionalization of Diarylalkynes under Merged Gold/Organophotoredox Relay Catalysis
作者:Shashank P. Sancheti、Manjur O. Akram、Rupam Roy、Vaibhav Bedi、Shubhankar Kundu、Nitin T. Patil
DOI:10.1002/asia.201901275
日期:2019.12.13
highly functionalized 2-(2-hydroxyaryl)-2-alkoxy-1-arylethan-1-ones. Detailed mechanistic studies suggested a relay process, initiating with gold-catalyzed hydroalkoxylation of alkynes, to generate enol-ether followed by a key formal [4+2]-cycloaddition reaction. The successful application of the present methodology was also shown for the synthesis of benzofurans.
KOENIGKRAMER R. E.; ZIMMER H., J. ORG. CEM., 1980, 45, NO 20, 3994-3998
作者:KOENIGKRAMER R. E.、 ZIMMER H.
DOI:——
日期:——
.alpha.-Heterosubstituted phosphonate carbanions. 11. Benzoins via an acyl anion equivalent. Novel one-pot preparation of benzo[b]furans via benzoins using hydriodic acid
作者:Rusty E. Koenigkramer、Hans Zimmer
DOI:10.1021/jo01308a009
日期:1980.9
Flexible Synthesis of Benzofuranones from
<i>ortho</i>
‐Alkynyl Phenols or Benzofurans
作者:Wenqian Du、Rongjie Yang、Jiawen Wu、Zhonghua Xia
DOI:10.1002/ejoc.202201497
日期:2023.2.17
mild conditions. One protocol for benzofuranone is a gold-catalyzed cycloisomerization of o-alkynyl phenol with alcohol or acid. Another metal-free synthesis of benzofuranone is the treatment of benzofuran with alcohol, acid, or H2O.
开发了两种合成苯并呋喃-3(2H)-酮的灵活方法,具有易于获得的起始原料、良好的化学选择性和非常温和的条件。苯并呋喃酮的一种方案是金催化的邻炔基苯酚与醇或酸的环化异构化。苯并呋喃酮的另一种无金属合成是用醇、酸或 H 2 O处理苯并呋喃。