Enantioselective aza-Henry reaction of t-Boc protected imines and nitroalkanes with bifunctional squaramide organocatalysts


SUSAM D. , TANYELİ C.

NEW JOURNAL OF CHEMISTRY, cilt.41, ss.3555-3561, 2017 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 41 Konu: 9
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1039/c6nj04078k
  • Dergi Adı: NEW JOURNAL OF CHEMISTRY
  • Sayfa Sayıları: ss.3555-3561

Özet

An organocatalytic asymmetric aza-Henry reaction of t-Boc protected imines with nitroalkanes has been established by chiral acid-base type bifunctional Cinchona alkaloid/squaramide organocatalysts. The cooperation of a quinine motif as a base and sterically encumbered squaramide (H-bond donor) enabled mostly complete conversion of a range of reactants into the corresponding aza-Henry products at room temperature with good selectivities (up to 91% ee with 10 mol% catalyst loading).