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Novel densely functionalized β2,2-amino acids were obtained in almost enantiopure form using down to 20 ppm of a chiral phase-transfer catalyst.

No abstract

The first highly asymmetric catalytic synthesis of densely functionalized dihydrobenzofurans is reported, which starts from ortho ‐hydroxy‐containing para ‐quinone methides. The reaction relies on an unprecedented formal [4+1]‐annulation of these quinone methides with allenoates in the presence of a commercially available chiral phosphine catalyst. The chiral dihydrobenzofurans were obtained as single diastereomers in yields up to 90 % and with enantiomeric ratios up to 95:5.

No abstract

Protocatechuic acid-4-, gallic acid-4-, caffeic acid-4-, ferulic acid- and p-coumaric acid-O-β-ᴅ-glucoside were synthesized. These substances were characterized by UV, 1H NMR, 13C NMR and FAB-MS. Their proportions in berry fruit and vegetable were determined by means of HPLC and capillary GC.

The first (3 + 2)-cyclisation of 3,3,3-trifluoropyruvate-derived imines and indandione-based Michael acceptors giving spirocyclic α-CF3-α-proline derivatives was developed.

No abstract