Pauson-Khand Reactions of Alkenyl Sulfones and Alkenyl Sulfoxides: Applications in Asymmetric Synthesis

Marta Rodríguez Rivero; Javier Adrio; Juan Carlos Carretero

doi:10.1055/s-2004-836050

ACCOUNT

Pauson-Khand Reactions of Alkenyl Sulfones and Alkenyl Sulfoxides: Applications in Asymmetric Synthesis

Marta Rodríguez Rivero, Javier Adrio, Juan Carlos Carretero*
Departamento de Química Orgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
Fax: +34(91)4973966; e-Mail: juancarlos.carretero@uam.es;

Abstract

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Abstract

Unlike other types of electron-deficient alkenes, alkenyl sulfones and alkenyl sulfoxides are excellent alkene partners in Pauson-Khand reactions (PKR). In the case of the intramolecular PKR of appropriately substituted 1-sulfinyl-1,6-enynes and 1-sulfonyl-3-oxygenated-1,6-enynes novel stereoselective processes and applications in asymmetric synthesis have been developed. Furthermore, using the cobalt-chelating dimethylaminophenyl vinyl sulfoxide as substrate, their intermolecular PKR with terminal alkynes provide the first intermolecular asymmetric version of PKR with non-strained alkenes. The resulting 5-sulfinyl-2-cyclopentenones are versatile intermediates in the enantioselective synthesis of natural cyclopentanoids.

1 Introduction
2 Background: PKR of Electron-Deficient Alkenes
3 Intramolecular PKR of γ-Oxygenated α,β-Unsaturated Sulfones and Related Enynes
4 PKR of α,β-Unsaturated Sulfoxides
4.1 Intramolecular Processes
4.2 Intermolecular Processes
4.3 Applications to the Enantioselective Synthesis of Natural Cyclopentanoids
5 Summary

Key words

Pauson-Khand reaction - alkenyl sulfones - alkenyl sulfoxides - asymmetric synthesis - chiral auxiliary - cyclopentanoid synthesis

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