Beilstein J. Org. Chem.2016,12, 2293–2297, doi:10.3762/bjoc.12.222
) were obtained for a series of spirocyclic 1,4-sulfur-bridged piperidinone-based succinimides.
Keywords: [4 + 2] annulation; asymmetric organocatalysis; dipeptide-basedBrønstedbases; 5H-thiazol-4-ones; N-itaconimides; Introduction
Sulfur-containing tetrasubstituted carbon stereocenters are widely
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Graphical Abstract
Scheme 1:
Substrate scope of the [4 + 2] annulation. Reaction conditions: 1 (0.1 mmol), 2 (0.15 mmol), V (0.0...