Elsevier

Tetrahedron

Volume 48, Issue 34, 1992, Pages 6985-7012
Tetrahedron

New and efficient approaches to the semisynthesis of taxol and its C-13 side chain analogs by means of β-lactam synthon method

https://doi.org/10.1016/S0040-4020(01)91210-4Get rights and content

Abstract

Highly efficient chiral ester enolate-imine condensation giving 3-hydroxy-4-aryl-β-lactams with excellent enantiomeric purity is successfully applied to the asymmetric synthesis of the enantiomerically pure taxol C-13 side chain, N-benzoyl-(2R,3S)-3-phenyl-isoserine and its analogs. (3R,4S)-N-benzoyl-3-(1-ethoxyethoxy)-4-phenyl-2-azetidinone readily derived from the 3-hydroxy-4-phenyl-β-lactam is coupled with protected baccatin IIIs, followed by deprotection to give optically pure taxol and 10-deacetyl-7,10-bis(Troc)-taxol in good yields. Fully assigned 1H, 13C, and 2D (COSY and HETCOR) NMR spectra of taxol thus synthesized are shown and discussed.

Highly efficient chiral ester enolate-imine condensation giving 3-hydroxy-4-arylβ-lactams with excellent enantiomeric purity is successfully applied to the asymmetric synthesis of (3R,4S-N-benzoyl-3-(1-ethoxy-ethoxy)-4-phenyl-2-azetidinone which is coupled with protected baccatin IIIs, followed by deprotection to give optically pure taxol and 10-deacetyl-7,10-bis(Troc)-taxol in good yields.

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