SilverCatalyzed Cascade Carboxylation and Cyclization of Trimethyl(2-methylenebut-3-yn-1-yl)silane Derivatives
摘要:
C-C bond forming carboxylation, and cyclization: of trimethyl(2-rnethylenbut-3,7yl)silaile derivatives and carbon dioxide was developed. Silver catalysts and CsF promoted the reaction to afford the:corresponding 2-furanone and 2-pyrone derivatives in good-to-high yields. The structure of the 2:furanone was confirmed by single-crystal X-ray crystallography, which revealed that the geometry of the exo-olefin was that of a Z-isomer. When an aromatic ring substituted alkyne was used, 2-furanone derivatives were selectively obtained via 5-exo-dig-cyclization, whereas the reaction of alkyl-substituted alkynes produced 2-pyrone derivatives with high selectivity.
Sutbeyaz, Yasar; Ceylan, Mustafa; Secen, Hasan, Journal of Chemical Research, Miniprint, 1993, # 8, p. 2189 - 2196
作者:Sutbeyaz, Yasar、Ceylan, Mustafa、Secen, Hasan
DOI:——
日期:——
Catalytic Formal Homo-Nazarov Cyclization
作者:Filippo De Simone、Julien Andrès、Riccardo Torosantucci、Jérôme Waser
DOI:10.1021/ol802970g
日期:2009.2.19
The first catalytic method for the cyclization of vinyl-cyclopropyl ketones (formal homo-Nazarov reaction) is reported. Starting from activated cyclopropanes, heterocyclic, and carbocyclic compounds were obtained under mild conditions using Bronsted acid catalysts. Preliminary investigation of the reaction mechanism indicated a stepwise process.
Simple method for controlling stereoselection in Mannich cyclization reactions of aldehydes
作者:Dirk A. Heerding、Chang Y. Hong、Noriyuki Kado、Gary C. Look、Larry E. Overman
DOI:10.1021/jo00077a004
日期:1993.12
By judicious choice of the nitrogen substituent, either stereoisomer of 1-substituted 1,2,3,4,6,7,8,8a-octahydroisoquinolines can be prepared by reactions of allylsilane amines 3 with aldehydes.