Beilstein J. Org. Chem.2016,12, 2893–2897, doi:10.3762/bjoc.12.288
stereospecific cyclic adducts.
Keywords: L-proline; ninhydrin; sarcosine; spiropyrrolidine; 5-vinylindazole; 5-vinylindole; Introduction
The [3 + 2] cycloaddition between azomethine ylides and olefins/acetylene as dipolarophiles is an important reaction to access a number of novel heterocyclic spiro scaffolds
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Graphical Abstract
Scheme 1:
Synthesis of N-alkyl vinylindoles and N-alkyl vinylindazoles (3).