Catalyzed Selective Direct α- and γ-Alkylation of Aldehydes with Cyclic Benzyl Ethers by Using T+BF4− in the Presence of an Inexpensive Organic Acid or Anhydride
作者:Heinrich Richter、Renate Rohlmann、Olga García Mancheño
DOI:10.1002/chem.201101786
日期:2011.10.4
The cross dehydrogenative coupling (CDC) of cyclicbenzylethers with aliphatic and α,β‐unsaturated aldehydes has been developed. The mild reaction conditions, in which an N‐oxoammonium salt derived from TEMPO (2,2,6,6‐tetramethyl‐1‐piperidinoxyl) is employed as the oxidant in combination with a Cu catalyst, allow the use of relatively redox‐unstable aldehydes under oxidative CDC conditions. The addition
DDQ-Mediated Direct Cross-Dehydrogenative-Coupling (CDC) between Benzyl Ethers and Simple Ketones
作者:Yuhua Zhang、Chao-Jun Li
DOI:10.1021/ja060050p
日期:2006.4.5
A direct Cross-Dehydrogenative-Coupling (CDC) between benzyl ethers and simple ketones was developed without using any metal catalyst. By using DDQ, various benzyl ethers and simples ketones were coupled together directly to form beta-alkoxyl ketones efficiently. A mechanism in which the DDQ serves the double roles of an oxidizing agent and an organomediator was proposed.
Decarboxylative Alkylation of<i>β</i>-Keto Acids with Isochromans under Oxidative Conditions
作者:Yan Chen、Shi-Kai Tian
DOI:10.1002/cjoc.201200994
日期:2013.1
An unprecedented decarboxylativealkylation reaction of β‐keto acids with isochromans has been developed underoxidativeconditions. A range of β‐keto acids smoothly undergo decarboxylativealkylation with isochromans in the presence of 2,2,6,6‐tetramethylpiperdine‐1‐oxoammonium hexafluorophosphate to give structurally diverse 1‐acylmethylisochromans in moderate to excellent yields with extremely high