Synlett 2010(10): 1442-1454  
DOI: 10.1055/s-0029-1219840
ACCOUNT
© Georg Thieme Verlag Stuttgart ˙ New York

From Vinylogation to Alkynylogation: Extending the Reactivity of Enolates

Bo Xu*, Gerald B. Hammond*
Department of Chemistry, University of Louisville, Louisville KY 40292, USA
Fax: +1(502)8523899; e-Mail: bo.xu@louisville.edu; e-Mail: gb.hammond@louisville.edu;
Further Information

Publication History

Received 13 February 2010
Publication Date:
20 April 2010 (online)

Abstract

Extending reactivity through conjugated multiple carbon-carbon bonds can be a rapid way to expand the scope of synthetic chemistry. In this account, we describe our research on the alkynylogation of enolates. We conducted a systematic investigation on reactions of alkynyl- and allenyl-substituted enolates with various electrophiles. Those reactions led to the convenient synthesis of highly functionalized allenes, alkynes, and 1,3-dienes. Some relevant literature reports are also described.

1 New Chemistry through the Extension of a Known Reaction

2 Generation of Alkynyl- and Allenyl-Substituted Enolates

3 Chemistry of Alkynyl- and Allenyl-Substituted Enolates ­towards Electrophiles

3.1 Alkynylogous Aldol Reaction

3.2 Reactions of Alkynyl-Substituted Enolates with Alkyl ­Halides

3.3 Reactions of Alkynyl-Substituted Enolates with Electron-Deficient Alkenes

3.4 Halogenations of Alkynyl-Substituted Enolates

3.5 Reactions of Allenyl-Substituted Enolates

4 Concluding Remarks