Convenient synthesis of α,β-unsaturated γ-butyrolactones and γ-butyrolactams via decarboxylative iodination of paraconic acids and β-carboxyl-γ-butyrolactams using 1,3-diiodo-5,5-dimethylhydantoin
A convenient synthetic approach to α,β-unsaturated γ-butyrolactones and α,β-unsaturated γ-butyrolactams is developed. The reaction proceeds via decarboxylativeiodination of paraconic acids and β-carboxyl-γ-butyrolactams, employing 1,3-diiodo-5,5-dimethylhydantoin (DIH) under irradiation, followed by dehydroiodination of β-iodo-γ-butyrolactones and γ-butyrolactams providing good yields of α,β-unsaturated
The direct enantioselective vinylogous Michael addition of unsaturated [gamma]-monosubstituted [gamma]-lactams was realized by using chiral phase-transfer catalysis as a means to give enantioenriched [gamma],[gamma]-disubstituted [gamma]-lactams.
An unexpected simple synthesis of N-substituted 2-acetoxy-5-arylpyrroles and their hydrolysis to 3 and 4-pyrrolin-2-ones
作者:Georgia Tsolomiti、Athanase Tsolomitis
DOI:10.1016/j.tetlet.2004.10.136
日期:2004.12
The unexpected synthesis of N-substituted 2-acetoxy-5-arylpyrroles, from the reaction of 3-aroyl-propionamides with a large excess of refluxing acetylchloride, and their alkaline hydrolysis to 3- and 4-pyrrolin-2-ones, is described.