Synthesis 2012; 44(24): 3699-3721
DOI: 10.1055/s-0032-1317489
review
© Georg Thieme Verlag Stuttgart · New York

Strategies for Spiroketal Synthesis Based on Transition-Metal Catalysis

Jean A. Palmes
University of Florida, Department of Chemistry, P.O. Box 117200, Gainesville, FL 32611-117200, USA   Fax: +1(352)8460296   Email: aponick@chem.ufl.edu
,
Aaron Aponick*
University of Florida, Department of Chemistry, P.O. Box 117200, Gainesville, FL 32611-117200, USA   Fax: +1(352)8460296   Email: aponick@chem.ufl.edu
› Author Affiliations
Further Information

Publication History

Received: 08 September 2012

Accepted after revision: 27 September 2012

Publication Date:
07 November 2012 (online)


Abstract

The transition-metal-catalyzed synthesis of spiroketals is a rapidly growing area and these methods have facilitated the use of new spiroketal synthons as latent spiroketal equivalents. This review highlights the different substrate classes and provides select examples of applications in natural product synthesis.

1 Introduction

2 Conformational Aspects of Spiroketal Structures

3 Traditional Approaches to Spiroketal Synthesis

4 Transition-Metal-Catalyzed Spiroketalization

4.1 Dihydroalkoxylation of Alkynediols

4.2 Spiroketalization of Monopropargylic Triols

4.3 Intramolecular Reaction of Epoxy Alkynes

4.4 Spiroketalization of Propargyl Vinyl Ethers

4.5 Oxycarbonylation of Dienones

4.6 Transposition of Allylic Alcohols

4.7 Hetero-Diels–Alder Reaction

4.8 Cyclization of Monoacetylated Ketodiol

4.9 Ring-Rearrangement and Ring-Closing Metathesis

4.10 [2+2+2] Cycloaddition of C-Alkynyl Carbohydrates

4.11 Pauson–Khand Reaction of Ketal Enynes

4.12 Tandem Cyclization and Cross-Coupling Reactions of β-Bromoketals and Aryl Iodides

4.13 Applications to Natural Product Synthesis

5 Outlook