A Soft Vinyl Enolization Approach to α-Acylvinyl Anions: Direct Aldol/Aldol Condensation Reactions of (<i>E</i>)-β-Chlorovinyl Ketones
作者:Hun Young Kim、Jian-Yuan Li、Kyungsoo Oh
DOI:10.1002/anie.201209876
日期:2013.3.25
Synthesizing the synthons: The development of α‐acylvinyl anion synthons has been achieved using direct α‐vinyl enolization of α,β‐unsaturated ketones under mild reaction conditions. The synthetic utility of such synthons has been demonstrated in intermolecular aldol and aldol condensation reactions, which provide synthetically useful allenyl ketone and enyne derivatives.
Gallium chloride catalyzed acylation of alkynes was studied to afford one of the most atom-economic and efficient methodologies for the preparation of β-chlorovinyl ketones. In contrast to the Friedel-Crafts acylation, only a catalytic amount of GaCl3 was needed to produce the target products in high stereoselectivity.
Martin,G.J.; Kirschleger,B., Comptes Rendus des Seances de l'Academie des Sciences, Serie C: Sciences Chimiques, 1974, vol. 279, p. 363 - 365
作者:Martin,G.J.、Kirschleger,B.
DOI:——
日期:——
Ambivalent Reactivity Modes of β-Chlorovinyl Ketones: Electrophilic Lithium [3]Cumulenolates from Soft Vinyl Enolization Strategy
作者:Hun Young Kim、Edward Oscar Rooney、Raymond Phillip Meury、Kyungsoo Oh
DOI:10.1002/anie.201302750
日期:2013.7.29
Soft spot: The softvinylenolization of (E)‐β‐chlorovinyl ketones results in the in situ generation of electrophiliclithium [3]cumulenolates, which react with nucleophiles such as another lithium [3]cumulenolate to stereoselectively form vinyl allenones. They can also react with ketimine esters to give 3‐methylenepyrrolidines.