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
Catalytic Enantioselective Oxidative Cross-Coupling of Benzylic Ethers with Aldehydes
作者:Zhilin Meng、Shutao Sun、Huiqing Yuan、Hongxiang Lou、Lei Liu
DOI:10.1002/anie.201308701
日期:2014.1.7
The first one‐pot enantioselectiveoxidative coupling of cyclic benzylicethers with aldehydes has been developed. A variety of benzylicethers were transformed into the corresponding oxygen heterocycles with high enantioselectivity. Mechanistic experiments were conducted to determine the nature of the reaction intermediates. The application of this strategy to coupling reactions with other nucleophiles