Chemoenzymatic synthesis of enantiomerically enriched 2-oxobicyclo[m.1.0]alkan-3-yl acetate derivatives


ÖZDEMİRHAN F. D. , ÇELİK M., ATLI S., Tanyeli C.

TETRAHEDRON-ASYMMETRY, cilt.17, ss.287-291, 2006 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 17 Konu: 2
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.tetasy.2006.01.004
  • Dergi Adı: TETRAHEDRON-ASYMMETRY
  • Sayfa Sayıları: ss.287-291

Özet

Racemic alpha'-acetoxy alpha,beta-unsaturated cyclopentanone and cyclohexanone have been resolved into the corresponding enantiomerically enriched alpha'-hydroxylated and acetoxylated compounds with 96-97% ee via PLE hydrolysis. Stereoselectivity in the palladium(II)-catalyzed reaction between the enantiomerically enriched alpha'-acetoxylated compounds and diazomethane has been investigated. In the alpha'-acetoxylated cyclopentenone, preferential cyclopropanation occurs in the anti-form, whereas alpha'-acetoxylated cyclohexenone affords both syn- and anti-products (syn:anti, 61:36%). The relative configuration of the products was determined by NOE experiments. (c) 2006 Elsevier Ltd. All rights reserved.