Imines that React with Phenols in Water over a Wide pH Range
摘要:
Cyclic imine derivatives that react with phenols, including tyrosine residues of peptides, have been developed. Reactions of the imines with phenols proceeded in water over a wide pH range (pH 2-10) at room temperature to 37 degrees C and afforded Mannich products without the need of additional catalysts.
Mannich-type reactions of a chiral bicyclic imine and various nucleophiles yield the corresponding adducts with good to high diastereoselectivity. The influence of the reaction conditions on the yield and stereochemical outcome is investigated. The configuration of the products is established by H-1 NMR spectroscopy, and the major isomers of two adducts are characterized by X-ray crystallography. (C) 2014 Elsevier Ltd. All rights reserved.
Monoimine Derived from <i>trans</i>-1,2-Diaminocyclohexane and Ethyl Glyoxylate: An Intermediate in Aza-Diels–Alder and Mannich Reactions
Novel enantiopure policyclic nitrogen heterocycles have been obtained in the diastereoselective aza-Diels-Alder or Mannich reaction of dienes with imine formed in situ from ethyl glyoxylate and (1R,2R)-diaminocyclohexane.
Imines that React with Phenols in Water over a Wide pH Range
作者:Maki Minakawa、Hai-Ming Guo、Fujie Tanaka
DOI:10.1021/jo8017389
日期:2008.11.7
Cyclic imine derivatives that react with phenols, including tyrosine residues of peptides, have been developed. Reactions of the imines with phenols proceeded in water over a wide pH range (pH 2-10) at room temperature to 37 degrees C and afforded Mannich products without the need of additional catalysts.