Asymmetric aldol addition of alpha-azido ketones to ethyl pyruvate mediated by a cinchona-based bifunctional urea catalyst


Okumus S., TANYELİ C. , DEMİR A. G.

TETRAHEDRON LETTERS, cilt.55, ss.4302-4305, 2014 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 55 Konu: 31
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1016/j.tetlet.2014.06.018
  • Dergi Adı: TETRAHEDRON LETTERS
  • Sayfa Sayıları: ss.4302-4305

Özet

The first asymmetric synthesis of ethyl 4-aryl-3-azido-2-hydroxy-2-methyl-4-oxobutanoates via a cinchona organocatalyst induced aldol addition of alpha-azido ketones to ethyl pyruvate has been developed. The coupling reaction under optimized conditions was carried out to furnish tetrafunctionalized synthons with enantioselectivities of up to 91:9 and enriched diastereoselectivities of up to 95:5 (syn:anti). (C) 2014 Elsevier Ltd. All rights reserved.