cis-(-)-Menthyl phenylglycidates in the asymmetric synthesis of taxol side chain


Er M. , Coskun N.

ARKIVOC, pp.153-160, 2009 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume:
  • Publication Date: 2009
  • Doi Number: 10.3998/ark.5550190.0010.c13
  • Title of Journal : ARKIVOC
  • Page Numbers: pp.153-160

Abstract

The one-pot azidation and benzoylation of a mixture of cis (-)-menthyl phenylglycidates provide quantitatively the corresponding (2R,3S)-, and (2S,3R)-3-azido-1-((1R,2S,5R)-2-isopropyl-5-methylcyclohexyloxy)-1-oxo-3-phenylpropan-2-yl benzoate. Enantiopure (2R,3S)-3-azido-1((1R,2S,5R)-2-isopropyl-5-methylcyclohexyloxy)-1-oxo-3-phenylpropan-2-yl benzoate crystallize from MeOH at room temperature in high yields. The reduction of the latter with Zn-TMSCl produces (-)-menthyl 3-benzamido-3-phenyl-2-(trimethylsilyloxy) propanoate which upon simultanious desilylation and hydrolysis provide the taxol side chain N-benzoyl-(2R, 3S)-3-phenylisoserine.