Highly Stereoselective [4+2] Cycloaddition of Azlactones to β,γ-Unsaturated α-Ketoesters Catalyzed by an Axially Chiral Guanidine Base
作者:Masahiro Terada、Hiroyuki Nii
DOI:10.1002/chem.201003015
日期:2011.2.7
cycloaddition reaction of azlactones with β,γ‐unsaturated α‐ketoesters was demonstrated by taking advantage of the multiple reactive sites on the azlactone with the use of an axially chiral guanidine‐base catalyst. The most likely reaction pathway involves three consecutive steps to provide a facile access to α‐amino δ‐lactones with a sugar framework in a highly stereoselective manner (see scheme).
Enantioselective synthesis of 1,2,4-triazolines catalyzed by a cinchona alkaloid-derived organocatalyst
作者:Qian Shao、Jiean Chen、Meihua Tu、David W. Piotrowski、Yong Huang
DOI:10.1039/c3cc46757k
日期:——
enantioselective organocatalytic process for the one-step synthesis of poly-substituted 1,2,4-triazolines is reported. The heterocycle formation is believed to go through a step-wise mechanism of nucleophilic addition of an azlactone to an azodicarboxylate in the presence of an organic base catalyst, followed by a TMSCHN2 mediated heterocyclization. Both theoretical calculations and experimental evidence suggest