The Effect of Sulfoxides on the Stereoselective Construction of Tetrahydrofurans: Total Synthesis of (+)-Goniothalesdiol
✍ Scribed by Dr. Gloria Hernández-Torres; Prof. Dr. M. Carmen Carreño; Dr. Antonio Urbano; Prof. Dr. Françoise Colobert
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 409 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0947-6539
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✦ Synopsis
Abstract
Good to excellent stereoselectivities were achieved in the reductive cyclization (with Et~3~SiH/trimethylsilyl trifluoromethanesulfonate (TMSOTf)) of enantiopure hydroxy sulfinyl ketones en route to 2,5‐cis‐disubstituted tetrahydrofuran skeletons. Electrostatic effects of the exocyclic sulfoxide, which stabilized the reactive intermediate oxocarbenium conformations, were responsible for the observed stereocontrol. A model is proposed to explain the results. The use of this reaction and the asymmetric β‐ketosulfoxide reduction as key steps facilitated the total enantioselective synthesis of the natural β‐C‐aryl glycoside (+)‐goniothalesdiol.
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